Infrared absorption of silane,ammonia, acetylene and diborane in the range of the CO2 laser emission lines: Measurements and modelling |
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Authors: | J. Förster Th. Hagen M. von Hoesslin J. Uhlenbusch |
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Affiliation: | (1) Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany;(2) Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany |
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Abstract: | Absorption spectra of the gases SiH4, NH3, C2H2 and of SiH4/Ar and SiH4/B2H6 mixtures have been measured in the spectral range of the CO2 laser from 9.2 to 10.8 µm. In agreement with literature, silane shows the highest absorption (absorption coefficient = 3.3 × 10–2 Pa–1 m–1). The deviation of the measured absorption behaviour of silane from literature, as far as the pressure dependence is concerned, can be explained by the enhanced spectral energy density in our experiment. This is confirmed by a rate-equation model involving the basic mechanisms of V-V and V-T energy transfer between vibrationally excited silane molecules. In contrast to silane, the absorption coefficient of NH3 at the 10P(20) laser line is 4.5 × 10–4 Pa–1 m–1 atp = 20 kPa and has its maximum of 4.5 × 10–3 Pa–1 m–1 at the 10R(6) laser line. For C2H2 and B2H6, is even less ( 2.1 Ò 10–5 Pa–1 m–1 for C2H2). |
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Keywords: | 33.20 34.50 |
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