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Showing papers in "Canadian Journal of Physics in 2007"


Journal ArticleDOI
TL;DR: In this article, a compact formula for deriving an effective Hamiltonian describing the time-averaged dynamics of detuned quantum systems is presented, which also works for ensemble-aware diferent quantum systems.
Abstract: This paper presents a useful compact formula for deriving an effective Hamiltonian describing the time-averaged dynamics of detuned quantum systems. The formalism also works for ensemble-averaged d...

358 citations


Journal ArticleDOI
TL;DR: In this paper, a catalog of astronomical sky spectra was used to study different aspects of OH spectroscopy and chemistry in the terrestrial night sky, including the vibrational population distribution.
Abstract: This study summarizes the use of a large catalog of astronomical sky spectra to study different aspects of OH spectroscopy and chemistry in the terrestrial night sky. The sky spectra are unique in that they have high spectral resolution, cover the entire visible wavelength region in one exposure, and are intensity-calibrated with respect to standard stars. The intensity calibration, in particular, allows a significant revision to the OH Meinel band intensity distribution that has been in use for 43~years and permits critical evaluation of the many available sets of OH emission coefficients. The spectra further allow the OH rovibrational population distributions to be monitored throughout many nights. The OH vibrational population distribution is found to change during the night, with the population ratio between the extreme high-v and low-v levels that we can detect, v = 9 and v = 3, varying by as much as a factor of two; the low-v levels being predominant earlier in the night. It has been common to deter...

73 citations


Journal ArticleDOI
TL;DR: In this article, the influence of chemical reactions on the problem of coupled heat and mass transfer by natural convection from a vertical stretching surface in the presence of a space- or temperature-dependent heat source effect is investigated.
Abstract: The influence of chemical reactions on the problem of coupled heat and mass transfer by natural convection from a vertical stretching surface in the presence of a space- or temperature-dependent heat source effect is investigated. The sheet is stretched linearly in the presence of a uniform transverse magnetic field. The fluid is assumed to be viscous and incompressible. The governing differential equations are transformed by introducing similarity variables into a system of nonlinear ordinary differential equations and solving them numerically on the assumption of a small magnetic Reynolds number. The effects of the various parameters on the velocity, temperature, and concentration profiles as well as the local wall shear stresses, the local Nusselt number, and the local Sherwood number are presented graphically and in tabular form. An analysis of the results obtained shows that the flow field is influenced appreciably by the chemical reaction, heat source, magnetic field, and suction or injection at the...

41 citations


Journal ArticleDOI
TL;DR: In this paper, Ozone (O3 and nitrous oxide (N2O) profiles obtained during that period of time (15 August -4 October) by the Sub-Millimetre Radiometer (SMR) aboard the Odin satellite are assimilated into MOCAGE (Modelisation Isentrope du transport Mesoechelle de l'Ozone Stratospherique par Advection), a global three-dimensional chemistry transport model of Meteo-France).
Abstract: Following an exceptionally active winter, the 2002 Southern Hemisphere (SH) major warming occurred in late September. It was preceded by three minor warming events that occurred in late August and early September, and yielded vortex split and break-down over Antarctica. Ozone (O3 and nitrous oxide (N2O) profiles obtained during that period of time (15 August – 4 October) by the Sub-Millimetre Radiometer (SMR) aboard the Odin satellite are assimilated into MOCAGE (Modelisation Isentrope du transport Mesoechelle de l'Ozone Stratospherique par Advection), a global three-dimensional chemistry transport model of Meteo-France. The assimilated algorithm is a three-dimensional-FGAT built by the European Centre for Research and Advance Training in Scientific Computation (CERFACS) using the PALM (Projet d'Assimilation par Logiciel Multi-methode) software. The assimilated O3 and N2O profiles and isentropic distributions are compared to ground-based measurements (LIDAR and balloon-sonde) and to maps of advected poten...

37 citations


Journal ArticleDOI
TL;DR: SaskMART as discussed by the authors is an iterative Multiplicative Algebraic Reconstruction Technique that generates accurate results and is insensitive to the initial estimate of the ozone profile up to 35 km altitude.
Abstract: A new algorithm, SaskMART, is presented that uses observations of limb-scattered sunlight and a radiative transfer model to determine the ozone number-density profile up to 35 km altitude. In practice, clouds limit the lower extent of the retrieval to around 15 km but if the troposphere is clear the retrieval can be extended to altitudes as low as 10 km. SaskMART is an iterative Multiplicative Algebraic Reconstruction Technique that generates accurate results and is insensitive to the initial estimate of the ozone profile. Examples are presented using the OSIRIS limb-scattered radiance measurements and good agreement has been found when these results are compared with those derived from SAGE II measurements. PACS Nos.: 33.20.Kf, 33.20.Lg, 42.68.Ca, 42.68.Mj, 92.60.H–, 92.60.hd

34 citations


Journal ArticleDOI
TL;DR: In this paper, the authors solved the problem of the relativistic spin-1 particle in the presence of the Aharonov-Bohm potential in two and three dimensions, while using the Duffin-Kemmer-Petiau equation.
Abstract: In this article we solved the problem of the relativistic spin-1 particle in the presence of the Aharonov–Bohm potential in two and three dimensions, while using the Duffin–Kemmer–Petiau equation. The wave functions as well as the energy spectrum, in both cases, have been obtained. The validity of the Pauli criterion in the Aharonov–Bohm effect is well discussed.

33 citations


Journal ArticleDOI
TL;DR: De Broglie waves are a simple consequence of special relativity applied to the complex-phase oscillations of stationary states as mentioned in this paper, and the synchronized oscilla wave is a consequence of the synchronized Oscilla.
Abstract: De Broglie waves are a simple consequence of special relativity applied to the complex-phase oscillations of stationary states. As de Broglie showed in his doctoral thesis, the synchronized oscilla...

29 citations


Journal ArticleDOI
TL;DR: In this article, the classical and semiclassical position and momentum information entropies for the reflectionless sech2 potential and a family of rational potentials are obtained explicitly.
Abstract: The classical and semiclassical position and momentum information entropies for the reflectionless sech2 potential and a family of rational potentials are obtained explicitly. The sum of these entropies is of interest for the entropic uncertainty principle that is stronger than the Heisenberg uncertainty relation. The analytic results relate the classical period of the motion, total energy, position and momentum entropy, and dependence upon the principal quantum number n. The logarithmic energy dependence of the entropies is presented. The potentials considered include as special cases the attractive delta function and square well. PACS Nos.: 03.67–a, 03.65.Sq, 03.65.Ge, 03.65.–w

27 citations


Journal ArticleDOI
TL;DR: A climatology of stratospheric nitrogen dioxide (NO2) in terms of mean and standard deviation, as a function of latitude (5° bins), altitude (10-46 km in 2 km bins), local solar time (24 h), and month is constructed based on the Odin/OSIRIS limb-scattering data from 2002-2005 as mentioned in this paper.
Abstract: A climatology of stratospheric nitrogen dioxide (NO2), in terms of mean and standard deviation, as a function of latitude (5° bins); altitude (10–46 km in 2 km bins); local solar time (24 h); and month is constructed based on the Odin/OSIRIS limb-scattering data from 2002–2005. The measured profiles, given at specific local solar times, are scaled to all 24 h using a photochemical box model. The Odin orbit gives near global coverage around the equinoxes and hemispheric coverage elsewhere, due to lack of sunlight. The mean NO2 field at a specific local solar time involves high concentrations in the polar summer, peaking at around 25 km, with a negative equatorward gradient. Distinct high levels between 40–50° latitude at 30 km in the winter/spring hemisphere are also found, associated with the so-called {Noxon-cliff}. The diurnal cycle reveals the lowest NO2 concentrations just after sunrise and steep gradients at twilight. The 1σ standard deviation is generally quite low, around 20%, except for winter and spring high latitudes, where values are well above 50% and stretch through the entire stratosphere, a phenomenon probably related to the polar vortex. It is also found that NO2 concentrations are log-normally distributed. Comparisons to a climatology based on data from a (REPROBUS) chemical transport model for the same time period reveal relative differences below 20% in general, which is comparable to the estimated OSIRIS systematic uncertainty. Clear exceptions are the polar regions in winter/spring throughout the atmosphere and equatorial regions below 25 km, where OSIRIS is relatively higher by 40% and more. These discrepancies are most likely attributable to limitations of the model, but this has to be investigated further.

25 citations


Journal ArticleDOI
TL;DR: In this article, the electron capture branching ratios for the odd-odd intermediate nuclei in double-beta (β-β)-decay decay using the new ion trap facility TITAN at the TRIUMF radioactive beam facility were investigated.
Abstract: We suggest a measurement of the electron capture (EC) branching ratios for the odd–odd intermediate nuclei in double-beta (β– β–) decay using the new ion trap facility TITAN at the TRIUMF radioactive beam facility. The EC branching ratios are important for evaluating the nuclear matrix elements involved in the β– β– -decay for both, the 2ν and the 0ν-decay mode. Especially the neutrinoless (0νββ) mode is presently at the center of attention, as it probes the Majorana character of the neutrino, and if observed unambiguously, knowledge of the nuclear matrix elements are the key for determining the neutrino mass. The EC branches are in most cases suppressed by several orders of magnitude relative to their β– -counterparts owing to much lower decay energies, and are, therefore, either poorly known or not known at all. Here, the traditional methods of producing the radioactive isotope through irradiation of a suitable target and then measuring the K-shell X-rays have reached a limit of sensitivity. In this not...

24 citations


Journal ArticleDOI
TL;DR: The Monte Carlo experiments suggested that the ANN–Markov technique yields good prediction skill and accurately retrieves the form of the iterative mapping, even for extremely noisy data.
Abstract: I assessed the performance characteristics of the feed-forward artificial neural network (ANN) as a first-order nonlinear Markov modelling technique. The ability to recover the underlying structure of five synthetic random time series was first tested. The method was then applied to an observed geophysical time series, and the results were compared against external empirical constraints and a simple representation of the underlying physics. The Monte Carlo experiments suggested that the ANN–Markov technique: (i) yields good prediction skill; (ii) in general, accurately retrieves the form of the iterative mapping, even for extremely noisy data; (iii) accomplishes the foregoing without any need to consider or adjust for the distributional characteristics of the data or driving noise; and (iv) accurately estimates the distribution of the strictly stochastic signal component. Application to a historical river-flow record again showed good forecast skill. Moreover, the robustness, flexibility, and simplicity o...

Journal ArticleDOI
TL;DR: In this article, the authors present a comparison of different time and space resolutions and coverage of atmospheric measurements from different remote sensing systems, making the direct comparison of the measurements very difficul...
Abstract: Space-based remote-sensing instruments providing atmospheric measurements have different time and space resolutions, and coverage. This makes the direct comparison of the measurements very difficul...

Journal ArticleDOI
TL;DR: In this article, the authors report on the daily mesospheric winter temperature series derived from ground-based spectral measurements of the hydroxyl airglow layer from the Auroral Station in Adventdalen near Longyearbyen, Svalbard (78°N, 15°E).
Abstract: This paper reports on the daily mesospheric winter temperature series derived from ground-based spectral measurements of the hydroxyl airglow layer from the Auroral Station in Adventdalen near Longyearbyen, Svalbard (78°N, 15°E). Temperature estimates from the four latest seasons (2001–2002 to 2004–2005) have been added to the series reported by Sigernes et al. J. Geophys. Res. 108(A9), 1342 (2003). Lomb–Scargle periodogram analyses were performed on both hourly and daily average temperatures to look for significant periods. From the daily means, ∼24 and ∼26 d oscillations that are consistent with a solar rotation modulation of the atmosphere were identified. Analyses of the hourly averaged data did not reveal any considerable diurnal and semidiurnal periods in the temperatures. The 2003–2004 mesopause winter was one of the warmest reported over Svalbard during the last 25 years. It is common to observe within a few days temperature fluctuations in the range 20–40 K. Some years show far less variation tha...

Journal ArticleDOI
TL;DR: The Lamb-shift experiment in muonic hydrogen (μ-p) aims to measure the energy difference between the atomic levels to a precision of 30 ppm as mentioned in this paper, which would allow the r.m.s.
Abstract: The Lamb-shift experiment in muonic hydrogen (μ– p) aims to measure the energy difference between the atomic levels to a precision of 30 ppm. This would allow the r.m.s. proton charge radius rp to be deduced to a precision of 10–3 and open a way to check bound-state quantum electrodynamics (QED) to a level of 10–7. The poor knowledge of the proton charge radius restricts tests of bound-state QED to the precision level of about 6 × 10–6, although the experimental data themselves (Lamb-shift in hydrogen) have reached a precision of × 10–6. Values for rp not depending on bound-state QED results from electron scattering experiments have a surprisingly large uncertainty of 2%. In our Lamb-shift experiment, low-energy negative muons are stopped in low-density hydrogen gas, where, following the μ– atomic capture and cascade, 1% of the muonic hydrogen atoms form the metastable 2S state with a lifetime of about 1 μs. A laser pulse at λ ≈ 6 μm is used to drive the 2S → 2P transition. Following the laser excitation...

Journal ArticleDOI
TL;DR: The most recent version of the Odin/SMR data, v2.1, showed the smallest systematic differences when compared to coincident MIPAS and sonde data.
Abstract: The Sub-Millimetre Radiometer (SMR) on board Odin measures various important atmospheric species, including stratospheric ozone. In this study we compare the three versions (v1.2, v2.0 and v2.1) of level 2 Odin/SMR global stratospheric ozone data to coincident level 2 MIPAS V4.61 and balloon sonde stratospheric ozone data during 2003. The most current product from Odin/SMR (at time of writing), the v2.1, showed the smallest systematic differences when compared to coincident MIPAS and sonde data. Between 17 and 55 km, v2.1 values agreed with MIPAS within 10% (a maximum of 0.42 ppmv), while comparisons to sonde measurements showed an agreement of typically 5-10% between 22 and 35 km (less than 0.5 ppmv below 33 km). Tropical latitudes below 35 km preseneted the largest absolute systematic differences between v2.1 and sonde coincidences, where Odin/SMR was systematically lower by ~0.9 ppmv (more than 10% difference) at approximately 30 km. Comparisons concerning the previous two Odin/SMR versions showed much larger systematic differences, especially at the higher and lower stratospheric altitudes. The main conclusion here is that we suggest that v2.1 of Odin/SMR ozone data should be used for scientific studies.

Journal ArticleDOI
Ingo Sick1
TL;DR: In this paper, the authors summarize various analyses of the world data on elastic electron scattering for the determination of the most precise charge rms-radius of the proton and present the Zemach moments needed for the interpretation of atomic HFS structure and μ-X-ray experiments.
Abstract: We summarize various analyses of the world data on elastic electron scattering for the determination of the most precise charge rms-radius of the proton. We also present the Zemach moments needed for the interpretation of atomic HFS structure and μ-X-ray experiments.PACS Nos.: 13.40.Gp, 13.40.Em, 14.20.Dh

Journal ArticleDOI
TL;DR: In this article, a new method is introduced that allows meteor radars to potentially produce height-dependent temperatures, rather than simply averaging over the meteor region, and the method is applied to data from the Clovar radar near London, Ontario, and then a three-way comparison between Rayleigh lidar temperatures, hydroxyl temperatures, and meteor temperatures is undertaken.
Abstract: A new method is introduced that allows meteor radars to potentially produce height-dependent temperatures, rather than simply averages over the meteor region. The method is applied to data from the Clovar radar, near London, Ontario, and then a three-way comparison between Rayleigh lidar temperatures, hydroxyl temperatures, and meteor temperatures is undertaken. The three methods prove to be complementary. The OH measurements have good accuracy, but suffer slightly from lack of precise knowledge about their height and the fact that they are effectively integrated over the depth of the OH layer. The lidar temperatures are measured at well-defined altitudes and have better accuracy than the meteor method. The meteor temperatures have the largest errors, but still provide sufficient accuracy for many types of atmospheric studies, and have the advantage that these measurements can be made 24 h a day and in all sky conditions (including during cloud and strong sunlight and moonlight). The measurements from the...

Journal ArticleDOI
TL;DR: In this paper, the authors used the asymmetric rotor model (ARM) on employing the Lipas parameter to correct the ARM energies, which conserved the good result for B(E2) values.
Abstract: The present study deals with a topic of current interest, getting clear evidence for triaxiality in the 120–130 Xe nuclei near A = 130. The odd–even staggering in a so-called gamma-vibrational band may be treated using the asymmetric rotor model (ARM) on employing the Lipas parameter. The Hilbert space is too limited to describe the full variation of the moment of inertia and, therefore, the Lipas Ansatz ismade to correct the ARM energies, which conserve the good result for B(E2) values.PACS Nos.: 21.10.Re, 21.60.Ev, 27.60.+j

Journal ArticleDOI
TL;DR: In this article, the reflection and refraction of a plane harmonic wave at the interface between two viscoelastic media are studied under generalized thermo-vis coelastic theory.
Abstract: Reflection and refraction of a plane harmonic wave at the interface between two viscoelastic media are studied under generalized thermo-viscoelastic theory. Using potential function, the governing equations reduce to two fourth-order ifferential equations. Coefficient ratios of reflection and refraction of different waves with the angle of incidence are obtained using continuous boundary conditions. By numerical calculations, the variation of coefficient ratios of reflection and refraction with the angle of incidence are illustrated graphically for aluminium–epoxy and magnesium crystal micropolar viscoelastic materials. Also, the effects of viscous and micropolar elastic are illustrated by numerical results in the theory of thermo-viscoelasticity without energy dissipation. PACS No.: 62.20.Dc

Journal ArticleDOI
TL;DR: The status of the stratospheric ozone and nitrogen dioxide data products from the Optical Spectrograph and InfraRed Imager System (OSIRIS) instrument on the Odin satellite is described in this article.
Abstract: This paper describes the status of the stratospheric ozone and nitrogen dioxide data products from the Optical Spectrograph and InfraRed Imager System (OSIRIS) instrument on the Odin satellite. The current version of the data products is 3.0, covering the period from November 2001 to the present. The O3 and NO2 retrieval methods are reviewed along with an overview of the error analyses and geophysical validation status.

Journal ArticleDOI
TL;DR: In this paper, the authors show the results of fitting the four Rainbow channels (cyan-magenta, cyan-green, cyan green, yellowmagenta and yellow-green) to reconstruct the traditionally filtered auroral wavelengths: green (557.7 nm), red (630.0 nm), and blue (427.8 nm).
Abstract: The prototype of an auroral colour camera named Rainbow was run at the Auroral Station in Adventdalen, Svalbard, Norway, during a Finnish optical campaign in February, 2004. Instead of narrow band-pass filters and grey-scale images, this imager records colour images of the aurora using four wide-band channels (a colour CCD) with the field-of-view of about 150 ◦ . In this study, we show the results of fitting the four Rainbow channels (cyan-magenta, cyan-green, yellow-magenta, yellow-green) to reconstruct the traditionally filtered auroral wavelengths: green (557.7 nm), red (630.0 nm), and blue (427.8 nm), which were simultaneously recorded by the meridian scanning photometer (MSP) at the same station. This fit is qualitatively extremely good and almost linear throughout the data. In studying the auroral evolution during substorms, there is no significant difference whether MSP or Rainbow data are used. However, due to wide-band colour channels, the background illumination has a strong effect on the Rainbow data. During low signal levels (only background or faint aurora) the reconstruction errors are larger. The data for this study were captured on 21 February 2004. The time period of interest includes a substorm sequence, which is examined using colour auroral images and data from the MSP.

Journal ArticleDOI
TL;DR: In this article, the authors developed a new model for the universe based on two key assumptions: first, the inertial energy of the universe is a constant, and second, the total energy of a particle, including the gravitational potential energy produced by the other mass in the universe, is zero.
Abstract: We develop a new model for the Universe based on two key assumptions: first, the inertial energy of the Universe is a constant, and second, the total energy of a particle, the inertial plus the gravitational potential energy produced by the other mass in the Universe, is zero. This model allows the speed of light and the total mass of the Universe to vary as functions of cosmological time, where we assume the gravitational constant to be a constant. By means of these assumptions, the relations between the scale factor and the other parameters are derived. The Einstein equation, by making it compatible with varying-c, is used and the Friedmann equations in this model are obtained. Assuming the matter content of the Universe to be perfect fluids, the model fixes γ to be 2/3. That is, the whole Universe always exhibits a negative pressure. Moreover, the behaviour of the scale factor is the same for any value of the curvature. It is also shown that the Universe began from a big bang with zero initial mass and...

Journal ArticleDOI
TL;DR: In this paper, the authors considered three-loop radiative corrections to the Lamb shift and hyperfine splitting in the Yennie gauge with two reducible radiative photon insertions in the electron line.
Abstract: We consider three-loop radiative corrections to the Lamb shift and hyperfine splitting. Corrections of order α3(Zα)5m are the largest still unknown contributions to the Lamb shift in hydrogen. We calculate radiative corrections to the Lamb shift and hyperfine splitting generated by the diagrams with insertions of one radiative photon and electron polarization loops in the graphs with two external photons. We also obtain corrections generated by the gauge-invariant sets of diagrams with two reducible radiative photon insertions in the electron line and a polarization operator insertion in one of the radiative photons, and diagrams with two reducible radiative photon insertions in the electron line and a polarization operator insertion in one of the external photons. Corrections to the Lamb shift and hyperfine splitting generated by the diagrams with insertions of the three-loop one-particle reducible diagrams with radiative photons in the electron line are calculated in the Yennie gauge.PACS Nos.: 12.20.Ds...

Journal ArticleDOI
TL;DR: The subject of Lamb waves contains a vast field of literature comprising many individual topics, with the current focus being the effective creation and use of Lamb wave in the fields of material.
Abstract: The subject of Lamb waves contains a vast field of literature comprising many individual topics, with the current focus being the effective creation and use of Lamb waves in the fields of material

Journal ArticleDOI
TL;DR: In this paper, an overview of laser spectroscopy experiments with cold, trapped, highly charged ions, which will be performed at the HITRAP facility at GSI in Darmstadt (Germany), are presented.
Abstract: An overview is presented of laser spectroscopy experiments with cold, trapped, highly charged ions, which will be performed at the HITRAP facility at GSI in Darmstadt (Germany). These high-resolution measurements of ground-state hyperfine splittings will be three orders of magnitude more precise than previous measurements. Moreover, from a comparison of measurements of the hyperfine splittings in hydrogen-like and lithium-like ions of the same isotope, QED effects at high electromagnetic fields can be determined within a few percent. Several candidate ions suited for these laser spectroscopy studies are presented.PACS Nos.: 12.20.Fv, 21.10.Ky, 32.10.Fn, 32.30.–r

Journal ArticleDOI
TL;DR: In this article, the forward and backward emission of relativistic and fast hadrons in the interactions of 4.5 A,GeV/c 32S with emulsion was carried out.
Abstract: An experimental study of the forward and backward emission of relativistic and fast hadrons in the interactions of 4.5 A,GeV/c 32S with emulsion was carried out. The study supports the conclusion that a collective mechanism is responsible for the production of particles in the backward hemisphere (which is restricted beyond the kinematics limit). The backward emission of both shower and grey particles can be described by an exponential decay law independent of the projectile size. The experimental results suggest that the backward particles result from the decay of the system in a latter stage of the interaction. While the average multiplicities of the shower particles emitted in the forward hemisphere are strongly dependent on the projectile size and incident momentum, the average values of those emitted into the backward hemisphere are found to be only a function of the target size (i.e., impact parameter). Thus, the backward particle production can be considered as a yield of a highly excited target sy...

Journal ArticleDOI
TL;DR: In this paper, an all-solid-state narrowband sodium lidar transmitter based on proven technologies is proposed, which includes the sum frequency generation of 589 nm coherent radiation.
Abstract: An all-solid-state narrowband sodium lidar transmitter based on proven technologies is proposed. These proven technologies include: (i) the sum frequency generation of 589 nm coherent radiation wit...

Journal ArticleDOI
TL;DR: In this paper, the proton structure corrections to the hydrogen ground-state hyperfine structure were evaluated using analytic fits to the most recent data and a value for the fractional correction Δpol of 1.3 ± 0.3
Abstract: We consider the proton structure corrections to the hydrogen ground-state hyperfine structure, focusing on a state-of-the-art evaluation of the inelastic nucleon corrections — the polarizability corrections — using analytic fits to the most recent data. We find a value for the fractional correction Δpol of 1.3 ± 0.3 ppm. This is 1–2 ppm smaller than the value of Δpol one would deduce using hyperfine-splitting data and elastic proton structure corrections obtained from modern form factor fits. In addition, we discuss the derivations of the relevant formulas, paying attention to lepton mass effects and to questions surrounding the use of unsubtracted dispersion relations. PACS Nos.: 31.30.Gs, 32.10.Fn, 14.20.Dh, 13.40.Gp

Journal ArticleDOI
TL;DR: In this paper, five-plus years of Odin/OSIRIS (Optical Spectrograph and Infrared Imager System) ozone profiles (version 3.0 and SaskMART) have been compared with coincident ozonesonde profiles from the tropopause.
Abstract: Five-plus years of Odin/OSIRIS (Optical Spectrograph and Infrared Imager System) ozone profiles (version 3.0 and SaskMART) have been compared with coincident ozonesonde profiles from the tropopause...

Journal ArticleDOI
TL;DR: In this article, spontaneous-emission branching fractions of 46 levels in Nd II, selectively populated via single-frequency laser excitation of a 10 keV ion beam, were measured.
Abstract: We measured the spontaneous-emission branching fractions of 46 levels in Nd II, selectively populated via single-frequency laser excitation of a 10 keV ion beam. The levels studied had term energies up to 29 955 cm–1, and decay branches with spontaneous emission in the range 372–850 nm were detected. The experimental accuracy for branching fractions over 0.1 was ~7%. We used these branching fractions along with our previously determined radiative lifetimes to infer transition probabilities and oscillator strengths for 430 transitions, which are useful for stellar abundance determinations. PACS Nos.: 32.70Cs, 95.30Ky