High-resolution jet-cooled spectroscopy of SF6:: The ν2+ν6 combination band of 32SF6 and the ν3 band of the rare isotopomers

被引:29
作者
Boudon, V
Hepp, M
Herman, M
Pak, I
Pierre, G
机构
[1] Univ Bourgogne, Phys Lab, CNRS, F-21011 Dijon, France
[2] Free Univ Brussels, Lab Chim Phys Mol, B-1050 Brussels, Belgium
[3] Univ Cologne, Inst Phys 1, D-50937 Cologne, Germany
关键词
D O I
10.1006/jmsp.1998.7699
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
The Fourier transform infrared spectrum of SF6 was recorded in a supersonic expansion jet of an SF6/argon mixture. The SF6:Ar seeding ratio was 2:3. The instrumental bandwidth was 0.005 cm(-1). A globar source and an MCT detector were used. A rotational temperature of approximately 30 K was achieved. The nu(2) + nu(6) combination band of (SF6)-S-32 was analyzed using a modified version of the spherical top data system (STDS) programs developed in Dijon. Avery good fit was obtained for this band with an rms of 0.0036 cm(-1). The effective Hamiltonian was developed up to fourth order for the upsilon(2) + upsilon(6) part, to second order for the nu(2) and ground state parts, and to first order for the nu(6) part. Five hundred twenty-one transitions were assigned, 40 of them reaching the F-2u forbidden sublevel. The positions of the two F-1u and F-2u sublevels are found to be 991.276 and 989.487 cm(-1), respectively. The upsilon(3) band of the (SF6)-S-33 and (SF6)-S-34 isotopomers were also analyzed. Parameters and simulations are presented. A first detection of the nu(3) Q branch of (SF6)-S-36 (0.02% natural abundance) is reported. (C) 1998 Academic Press.
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页码:359 / 367
页数:9
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