Topic
Buffer gas
About: Buffer gas is a research topic. Over the lifetime, 3565 publications have been published within this topic receiving 47283 citations.
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TL;DR: In this paper, mass selective buffer gas cooling is applied to all elements and the mass resolving power achieved has proven to be sufficient to resolve isobars, and the observed cyclotron frequency is shifted.
Abstract: Mass selective buffer gas cooling is a technique used for ions that are stored in a Penning trap. The technique can be applied to all elements and the mass resolving power achieved has proven to be sufficient to resolve isobars. When not only a few but 106 and more ions are stored at the same time, space charge starts to play a dominant role for the spatial distribution. In addition, the observed cyclotron frequency is shifted. This work investigates these effects by numerical calculations.
18 citations
TL;DR: In this paper, N-type resonances excited in rubidium atoms confined in micrometric-thin cells with variable thickness from 1μm to 2mm were studied experimentally for the cases of a pure Rb atomic vapor and of a vapor with neon buffer gas.
Abstract: N-type resonances excited in rubidium atoms confined in micrometric-thin cells with variable thickness from 1 μm to 2 mm are studied experimentally for the cases of a pure Rb atomic vapor and of a vapor with neon buffer gas. Good contrast and narrow linewidth were obtained for thicknesses as low as 30 μm. The higher amplitude and sharper profile of N-type resonances in the case of a buffered cell was exploited to study the splitting of the Rb85D1N-resonance in a magnetic field of up to 2200 G. The results are fully consistent with the theory. The mechanism responsible for forming N-resonances is discussed. Possible applications are addressed.
18 citations
TL;DR: In this paper, the authors used mixtures of krypton and iodine in a high-pressure dielectric barrier discharge to provide intense multi-wavelength radiation at λ=183nm.
Abstract: New ultraviolet (UV) sources (excimer lamps) have been demonstrated using mixtures of krypton and iodine in a high-pressure dielectric barrier discharge to provide intense multi-wavelength radiation at λ=183 nm (atomic iodine line, 4
P
5/2?2
P
3/2), 191 nm (KrI*, B
1/2?X
1/2), 206 nm (atomic iodine line, 2
P
3/2?2
P
1/2), and 342 nm (I*
2, D
1/2?X
1/2). The characteristics of the optical emission spectra of the atomic species and the excited dimers (excimers) formed for different total gas pressures and in the presence of a buffer gas have been investigated. The highest intensity, at 183 nm, is obtained at pressures up to 1 bar while the overall emission spectra can be controlled by adjusting the total pressure. The results show that these strong multi-wavelength lamps offer an interesting alternative to conventional UV sources.
18 citations
TL;DR: In this paper, a kinetic study of electronically excited lead atoms in the 6p2(1S0) state, 3.65 eV above the ground state, is presented.
Abstract: A kinetic study of electronically excited lead atoms in the 6p2(1S0) state, 3.65 eV above the 6p2(3P0) ground state, is presented. The optically metastable atoms were generated by the pulsed irradiation of tetraethyl-lead in the presence of excess helium buffer gas and monitored photoelectrically in absorption by attenuation of resonance radiation at λ= 500.5 nm (Pb(7s(1P°1)→6p2(1S0))). The decay of the excited atom has been studied in the presence of a number of added gases. Second order quenching rate constants are reported for the following collision partners: Xe, H2, O2, N2, CO, NO, CO2, N2O, CH4, C2H4, C2H2, CF4, SF6 and Pb(C2H5)4. The quenching data for a given molecule are compared with those of Pb(61D2). The general collisional behaviour of the pair of states is discussed in relation to data for the low lying 1D and 1S states of the np2 and np4 ground state configurations of other atoms in Groups IV and VI, respectively.
18 citations
TL;DR: In this paper, a simple method for pulsed photoacoustic system calibration is presented, where analysis of the signal shape is performed with different types of absorbing molecules (SF6 and C2H4) and the same buffer gas.
Abstract: The proposal of a simple method for pulsed photoacoustic system calibration is presented. Analysis of the photoacoustic signal shape is performed with different types of absorbing molecules (SF6 and C2H4) and the same buffer gas (Ar). Different total pressures (ptotal) of such gas mixtures and different laser fluences are used to obtain experimental results and compare them with theory. Results from such a comparison are used directly for the calculation of a calibration curve. A single experimental point calibration procedure for the case of highly vibrationally excited absorbing SF6 molecules is confirmed.
18 citations