ISSN:
1432-0649
Keywords:
33.20
;
34.50
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01080954
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