High-Resolution Spectrum and Rovibrational Analysis of the ν2/ν5 Dyad of D3SiF near 700 cm−1

The Equilibrium Structure of Silyl Fluoride

“…It is simple and of considerable interest as a spectroscopic prototype molecule. But, although much work has already been devoted to the determination of spectroscopic properties, particularly by Bürger's group (1)(2)(3)(4)(5)(6)(7)(8)(9), there is not yet any experimental equilibrium structure available. This is due mainly to the fact that the determination of the rotational constants of fundamentally excited states is difficult because most of these states are in interaction.…”

The (ν1, ν4, ν2+ν3, ν3+ν5) Polyad of D328SiF around 1600 cm−1, Studied by High-Resolution FTIR Spectroscopy

“…As shown in Table 4, the difference for the main terms is 25% for C (1) 11 and 20% for C (2) 21 . We checked, through our best abandoned trial, that the "wanted" α A of ν 1 and ν 2 + ν 3 parameters did not move enough from those of predicted.…”

“…D 3 SiI was prepared as described in (9). Since the LiAlD 4 had a deuterium enrichment of 99% at most, our D 3 SiF sample was unavoidably contaminated by approximately 3% of HD 2 SiF. The Si isotopic abundance in the sample is 92%…”

“…While the v 3 = 1 and v 6 = 1 states were treated as isolated, the v 2 = 1 (A 1 , 710.157 cm −1 ) and v 5 = 1 (E, 701.717 cm −1 ) states were found strongly coupled by Coriolis ( K = = ±1) and α ( K = ±2, = ∓1) interactions and were treated in an interacting dyad (2), taking also into Supplementary data for this article are available on IDEAL (http://www. idealibrary.com) and as part of the Ohio State University Molecular Spectroscopy Archives (http://msa.lib.ohio-state.edu/jmsa hp.htm).…”

“…E-mail: zizi@fsr.ac.ma. 2 Permanent address: Département de Physique, Faculté des Sciences, Université Ibn Tofaïl, B.P. 133, Kénitra, Morocco.…”