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).
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
J. Förster, M.v. Hoesslin, J.H. Schäfer, J. Uhlenbusch, W. Viöl: InProc. 10th Int'l Symp. on Plasma Chemistry, ed. by U. Ehlemann, H.G. Lergon, K. Wiesemann,1, 1.4–23p1snow, Bochum, Germany (1991) paper 1.4-23p1-1.4-23p6
J. Förster, M.v. Hoesslin, J.H. Schäfer, J. Uhlenbusch: InProc. 11th Int'l Symp. on Plasma Chemistry, ed. by J. Harry, Loughborough, UK (1993) pp. 1739–1744
M.v. Hoesslin, J. Förster, J.H. Schäfer, J. Uhlenbusch: Appl. Phys. B61, 367 (1995)
J.S. Haggerty, W.R. Cannon: InLaser Induced Chemical Processes, ed. by J.I. Steinfeld (Plenum, New York, 1981) Chap. 3, pp. 165–241
R.R. Patty, G.M. Russwurm, W.A. McClenny, D.R. Morgan: Appl. Opt.13, 2850 (1974)
R.C. Lord, E. Nielsen: J. Chem. Phys.19, 1 (1951)
W.J. Lehmann, C.O. Wilson, I. Shapiro: J. Chem. Phys.28, 781 (1958)
I.N. Knyazev, N.P. Kuzmina, V.S. Letokhov, V.V. Lobko, A.A. Sarkisyan: Appl. Phys.22, 429 (1980)
R.V. Ambartzumian, N.P. Furzikov, Yu.A. Gorokhov, V.S. Letokhov, G.N. Makarov, A.A. Puretzkii: Opt. Commun.18, 517 (1976)
E.M. Alonso, R.J. Angelo, E.J. Quel: Appl. Phys. B47, 233 (1988)
M.L. Azcarate, E.J. Quel: Appl. Phys. B47, 223 (1988)
M. Snels, R. Larciprete, R. Fantoni, E. Borsella, A. Giardini-Guidoni: Chem. Phys. Lett.122, 480 (1985)
J.W.C. Johns, W.A. Kreiner, J. Susskind: J. Mol. Spectrosc.60, 400 (1976).
J. Förster: Laserchemische Erzengung, Charakterisierung und Verdichtung ultrafeiner SiC- und SiC/B-Pulver. Dissertation, Heinrich-Heine-Universität Düsseldorf, Germany (1995)
H. Stafast: Appl. Phys. A45, 93 (1988)
W. Fuß: Private communications, Max-Planck Institut für Quantenoptik, München, Germany (1994)
K. Smith, J.K. Thomson:Computer Modelling of Gas Lasers (Plenum, New York 1978)
T. Doerk, J. Ehlbeck, P. Jauernik, J. Stanco, J. Uhlenbusch, T. Wottka: J. Phys. D.26, 1015 (1993)
E.A. Gregory, M.M. Maricq, R.M. Siddles, C.T. Wickham-Jones, C.J.S.M. Simpson: J. Chem. Phys.78(6), 3881 (1983)
M.v. Hoesslin: Aufbauener Box-CARS-Diagnostik zur Messung von räumlichen Dichte- und Temperatur profilen in einer laser induzierten chemischen Reaktionszone. Dissertation, Heinrich-Heine-Universität Düsseldorf, Germany (1993)
G. Herzberg:Molecular Spectra and Molecular Structure. II. Infrared and Raman Spectra of Polyatomic Molecules, (Van Nostrand Reinhold, New York 1944) p. 81
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Förster, J., Hagen, T., von Hoesslin, M. et al. Infrared absorption of silane, ammonia, acetylene and diborane in the range of the CO2 laser emission lines: Measurements and modelling. Appl. Phys. B 62, 263–272 (1996). https://doi.org/10.1007/BF01080954
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01080954