Analysis of the ν4 (615 cm−1) region of the Fourier transform and diode laser spectra of SF6

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

“…Because of the lack of information about the forbidden 6 mode, Ᏼ { 6 } was developed only to first order.…”

“…The assignments of the 2 ϩ 6 band of 32 SF 6 were realized as follows. Preliminary simulations were calculated using the model described above and parameters for the 6 and 2 bands taken from the literature, i.e.,…”

“…The most complete work ever published on combination, overtone, and hot bands of SF 6 was that of McDowell et al (10,11), who observed 29 bands, but only at a relatively moderate resolution (0.05 cm Ϫ1 ) that did not allow a very detailed analysis. These difficulties are due to the weakness of the combination and overtone bands and to the congestion of the fine structure, for this heavy species.…”

“…Apart form the two strong fundamental bands 3 (3-5) and 4 (6) and from the overtones of 3 (7)(8)(9), only a few high-resolution studies were published on this molecule, compared with other spherical tops like CH 4 or SiH 4 for example. The most complete work ever published on combination, overtone, and hot bands of SF 6 was that of McDowell et al (10,11), who observed 29 bands, but only at a relatively moderate resolution (0.05 cm Ϫ1 ) that did not allow a very detailed analysis.…”

“…First of all, its high degree of symmetry combined with a relatively high molecular weight makes it a good candidate for the study of fundamental problems related to molecular physics and symmetry (1,2). Moreover, due to its chemical inertness it is easier to study than other hexafluoride molecules (MoF 6 , WF 6 , UF 6 , PuF 6 , . .…”