Showing papers in "Journal of Molecular Spectroscopy in 2014"

TL;DR: In this article, the vibrational ground tone or fundamental vibrational energy splitting of H2, HD, and D2 are obtained from Doppler-free laser spectroscopy applied in a collisionless environment.

TL;DR: In this article, the first principles calculation of transition dipoles, upon which the intensity is based, relies on three distinct steps: the quantum chemical calculation of the dipole moment surface at a grid of geometries, the accurate representation of this surface using an appropriate functional form and the wave functions used to represent the initial and final states, which in turn depend on the accuracy of the potential energy surface used to generate them.

TL;DR: In this paper, the authors derived constraints on a possible fifth-force interaction between hadrons based on results from laser precision frequency measurements of antiprotonic helium atoms, both p ¯ 4 He + and p ¯ 3 He + species, and from experiments on resonant formation rates of dd μ + -ions in muon-catalyzed fusion processes.

TL;DR: In this article, a relativistic four-component configuration interaction approach to study P -and Todd interaction constants in atoms and molecules is employed to determine the electron electric dipole moment effective electric field in the first excited state of the ThO molecule.

TL;DR: In this article, the authors investigated the effect of the probe laser light shift on ro-vibrational spectroscopy of the molecular hydrogen ions H 2 + and HD + in order to assess their potential for the realization of optical clocks that would be sensitive to possible variations of the proton-to-electron mass ratio.

TL;DR: In this article, three-wave mixing for enantiomer differentiation in the microwave regime using rotational transitions in cold gas-phase samples of menthone and carvone was demonstrated.

TL;DR: In this paper, the authors measured mid-IR absorption cross-sections for methane, ethane, ethylene and methanol using a Fourier transform-infrared (FTIR) spectrometer with temperatures ranging from 296-1100 K and pressures near atmospheric.

TL;DR: In this paper, the authors report on the production, deceleration and detection of a SrF molecular beam from a supersonic expansion and demonstrate the removal of up to 40% of the kinetic energy with a 2-m long modular traveling-wave decelerator.

TL;DR: In this article, the authors derived the self-continuity cross section of the collision induced absorption band of the first overtone band of H 2 in the vicinity of the Q (1) line.

TL;DR: In this article, the absolute line positions at the zero pressure limit have been determined with an accuracy of 3 × 10 - 4 cm - 1, agreeing well with the high-level quantum chemical calculations including relativistic and QED corrections.

TL;DR: In this article, a new global study of the millimeter wave, submillimeter wave and THz spectra of the lowest three torsional states of acetaldehyde (CH3CHO) was presented.

TL;DR: In this article, the authors show that the radiative decay to vibrational levels of the A 2 Π 1 / 2 state and the nearby perturber state sometimes called [18.6] 0.5.

TL;DR: In this paper, the population in individual rovibronic states of trapped HfF+ with a single-shot absolute efficiency of 18% was detected by resonanceenhanced multiphoton photodissociation (REMPD).

TL;DR: In this paper, the terahertz absorption spectra of anhydrous and monohydrated glucose have been investigated and compared by using THz spectroscopy and solid-sate density functional theory.

TL;DR: In this article, a dipole moment surface (DMS) of phosphine was constructed using extended ab initio CCSD(T) (CCSD(T)-F12) calculations at 11,697 nuclear configurations.

TL;DR: In this article, the Schrodinger equation was solved with the improved Tietz potential energy model in D spatial dimen-sions, and the D-dimensional rotation-vibrational energy spectra were obtained by using the supersymmetric shape invariance approach.

TL;DR: In this paper, high frequency pure rotational transitions of the simplest Criegee intermediate, methylene peroxide (CH2OO), have been measured up to 1 THz.

TL;DR: In this article, the two-top molecule methyl acetate was measured using five spectrometers in four different labs: a room temperature chirped-pulse Fourier transform microwave (FTMW) spectrometer in the frequency range from 8.7 to 26.5 GHz, two molecular beam FTMW Spectrometers (2 −40 −40 GHz), a free jet absorption Stark-modulated Spectrometer (60 −78 −78 GHz), and a room-temperature millimeter-wave (44 −68 −68 GHz).

TL;DR: In this article, a new Herriott cell and associated transfer optics have been designed and fabricated at Connecticut College under contract with NASA Langley Research Center to operate for the first time with the broadband Bruker IFS-125HR Fourier transform spectrometer at the Jet Propulsion Laboratory (JPL).

TL;DR: In this paper, the rotational spectrum of the cis-methyl vinyl ether was analyzed in the vibrational ground state and in the first excited states of in-plane bending mode ( ν 16 ) and methyl (λ 23 ) and skeletal (λ 24 ) torsional modes.

TL;DR: In this article, an ultra-cold sample of ammonia molecules is released from an electrostatic trap and recaptured after a variable time, which offers interesting prospects for high-resolution spectroscopy and precision tests of fundamental physics theories.

TL;DR: In this article, the authors report high temperature spectroscopic measurements of water vapor carried out in the far infrared domain, along with previously published microwave, far infrared, and infrared measurements, are fitted using a modified version of the Bending-Rotation approach.

TL;DR: In this article, the authors performed ab initio calculations relevant to predict the cross-section of an experimentally accessible (1 + 1 ′ ) resonanceenhanced multiphoton dissociation (REMPD) pathway in AlH+.

TL;DR: In this paper, the spectral line positions and intensities of pure PH 3 from two Fourier transform spectrometers were determined for the Pentad of PH 3 between 1950 and 2450 cm −1.

TL;DR: In this paper, the authors present an experiment that aims to constrain, over a few-year timescale, the fractional temporal variation of the proton-to-electron mass ratio, β = mp/me, at a level of 10 −15 /yr by means of a spectroscopic frequency measurement on a beam of cold CF3H molecules.

TL;DR: In this article, the microwave spectra of six isotopologues each of 2-chloro-1,1-difluoroethylene and its argon complex are obtained in the 5.6-20.5 GHz region using a combination of broadband chirped pulse and Balle-Flygare cavity Fourier transform microwave techniques.

TL;DR: In this paper, the infrared spectra of a-C3H4 and propyne are measured in the gas phase at temperatures ranging from 296 to 510 K. Absolute integrated intensities of the main infrared bands are deter- mined at room temperature and compared with values derived from literature for both molecules.

TL;DR: The microwave spectrum of n-hexyl acetate was recorded in the range of 10−13.5 GHz using the Aachen MB-FTMW spectrometer as discussed by the authors.

TL;DR: In this paper, high-resolution infrared spectra of diacetylene (HC 4 H) are recorded in the 3μm C H stretch region using continuous wave cavity ring-down spectroscopy (cw-CRDS).

TL;DR: In this article, the vibrational transition frequencies of alkali earth-alkali diatomic molecules and alkali Earth-hydride molecular ions were measured and used for detecting a possible variation in the proton-electron mass ratio, possibly at the 10 −16 sensitivity level.