1985
DOI: 10.1063/1.448668
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Rovibrational molecular populations, atoms, and negative ions in H2 and D2 magnetic multicusp discharges

Abstract: Coherent anti-Stokes Raman scattering is applied to the study of rovibrational populations in magnetic multicusp H2 and D2 discharges. This subject is of interest to negative hydrogen ion formation by volume plasma processes. The populations of high-lying rotational states (J≳5) in the vibrational levels v=0, 1, and 2 are found to be significantly higher than expected from the Boltzmann law. In H2 the net populations of the first four vibrational levels follow approximately the Boltzmann law, with the vibratio… Show more

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Cited by 130 publications
(68 citation statements)
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“…The rovibrational population leaving the plasma source 30,31 shows a remarkable similarity with rovibrational distributions measured in other plasma environments. 17,[23][24][25] The higher rotational levels (Jу5) in all of the aforementioned studies are overpopulated, usually even by orders of magnitude. Although the measurements are performed in different experiments, under very different experimental conditions ͑pressure, temperature, electron density, and electron temperature͒ the distributions are stunningly similar.…”
Section: Introductionmentioning
confidence: 99%
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“…The rovibrational population leaving the plasma source 30,31 shows a remarkable similarity with rovibrational distributions measured in other plasma environments. 17,[23][24][25] The higher rotational levels (Jу5) in all of the aforementioned studies are overpopulated, usually even by orders of magnitude. Although the measurements are performed in different experiments, under very different experimental conditions ͑pressure, temperature, electron density, and electron temperature͒ the distributions are stunningly similar.…”
Section: Introductionmentioning
confidence: 99%
“…And this reaction becomes five orders of magnitude more efficient when the rovibrational energy of the hydrogen molecule is increased to around 2.5 eV. 21,22 Since in the plasmas used for the production of the H Ϫ ion, the high rotational levels are usually enormously overpopulated, 17,[23][24][25] these high rotational levels play an important role in the production of the negative hydrogen ion. Knowledge of the behavior of the high rotational levels is therefore required.…”
Section: Introductionmentioning
confidence: 99%
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“…Unfortunately, the electronic-vibro-rotational (ro-vibrational) transitions of H 2 or D 2 ground state are in the medium infrared region which is inconvenient for application of standard emission and absorption techniques for T g measurements. To overcome this problem and to measure T g of such an important molecule, different laser techniques were developed: coherent anti-stokes Raman scattering (CARS) [5][6], laser-induced fluorescence (LIF) [7,8]. Nevertheless, for practical reasons, the search for a simple, reliable optical emission spectroscopic (OES) technique continued, see e.g.…”
Section: Introductionmentioning
confidence: 99%