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High-Resolution Jet-Cooled Spectroscopy of SF6: The ν2+ ν6Combination Band of32SF6and the ν3Band of the Rare Isotopomers

✍ Scribed by V. Boudon; M. Hepp; M. Herman; I. Pak; G. Pierre

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
355 KB
Volume
192
Category
Article
ISSN
0022-2852

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✦ Synopsis

The Fourier transform infrared spectrum of SF 6 was recorded in a supersonic expansion jet of an SF 6 /argon mixture. The SF 6 :Ar seeding ratio was 2:3. The instrumental bandwidth was 0.005 cm Ϫ1 . A globar source and an MCT detector were used. A rotational temperature of approximately 30 K was achieved. The 2 ϩ 6 combination band of 32 SF 6 was analyzed using a modified version of the spherical top data system (STDS) programs developed in Dijon. A very good fit was obtained for this band with an rms of 0.0036 cm Ϫ1 . The effective Hamiltonian was developed up to fourth order for the 2 ϩ 6 part, to second order for the 2 and ground state parts, and to first order for the 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 Ϫ1 , respectively. The 3 band of the 33 SF 6 and 34 SF 6 isotopomers were also analyzed. Parameters and simulations are presented. A first detection of the 3 Q branch of 36 SF 6 (0.02% natural abundance) is reported.

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