THE ROTATIONAL SPECTRUM OF ARGON-SILANE
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Date
1996
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Microwave spectra of Ar--$^{28}SiH_{4}$, Ar--$^{29}SiH_{4}$ and Ar--$^{30}SiH_{4}$ have been measured using a pulsed-nozzle Fourier-transform microwave (FTMW) spectrometer. The K=0 and K=1 components of the $J=3 \leftarrow 2$ through the $J = 7 \leftarrow 6$ transitions have been measured and assigned in the 9 - 24 GHz region. For the primary isotopic species, Ar--$^{28}SiH_{4}$ two K=0 (A and F symmetry) and three K=1 (E and F symmetry) rotational progressions are observed at the 1 K rotational temperature of the supersonic expansion. The rotational constant for the K=0, A state is B=1700.40624(9) MHz and the centrifugal distortion constants are $D_{j} = 29.089(3)$kHz and $H_{j} = -1.91(3)$ Hz, where the number in parentheses represents one standard deviation from the fit. The values of the rotational constants for the K=0 A and F states and for K=1 E states are in good agreement with the infrared determined values for Ar--$^{28}SiH_{4}$.$^{a}$ The Stark effects of the E state transitions are first order, yielding a dipole moment for Ar--$^{28}SiH_{4}$ of 0.027D. The splitting of the K = 1, F state provides an estimate of the barrier to internal rotation of the $SiH_{4}$ moiety of -$60 cm^{-1}$.
Description
$^{a}$ R. W. Randall, J. B. Ibbotson, and B. J. Howard, J. Chem. Phys., 100, 7051-7060(1994)
Author Institution: Department of Chemical Technology, Kanagawa Institute of Technology; Optical Technology Division, National Institute of Standards and Technology; The Graduate University for Advanced Studies, National Institute of Standards and Technology
Author Institution: Department of Chemical Technology, Kanagawa Institute of Technology; Optical Technology Division, National Institute of Standards and Technology; The Graduate University for Advanced Studies, National Institute of Standards and Technology