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Start Over Author "Sharpe, S.W." Journal journal of molecular spectroscopy
12 results on '"Sharpe, S.W."'

12. Rovibrational Spectroscopy of C35Cl<SUB>4</SUB>

Author

Xu, S.L., Mcdowell, R.S., Sharpe, S.W., and Krohn, B.J.

Abstract

High-resolution rotationally resolved infrared spectra of the spherical-top rotor C35Cl4 (in samples of natural isotopic composition) were obtained both in static cells by FTIR spectroscopy (ν4, ν1 + ν4) and in a supersonically cooled expansion with tunable diode lasers (ν3). For the ν3 fundamental at 799 cm−1, quantum assignments were made for individual transitions from P(20) to R(24), and the partially resolved Q branch was matched with synthesized spectra. The bands ν4 (316 cm−1) and ν1 + ν4 (774 cm−1) exhibit much reduced manifold splitting, and scalar fits were made to the R(24)-R(70) and P(38)-R(56) frequencies, respectively. The ν3/(ν1 + ν4) Fermi dyad yields Coriolis constants ζ3 = 0.621 and ζ'4 = −0.145 that satisfy the harmonic sum rule, but are perturbed by the Fermi resonance and are inconsistent with intramolecular force fields previously reported based on isotope shifts in matrix spectra. The true bending-mode Coriolis constant ζ4 = −0.414, obtained from analysis of the isolated and unperturbed ν4 band, agrees well with the isotope shifts. CCl4 and other tetrahedral XY4 molecules are shown to vibrate according to a simple vector-displacement normal-mode model for which ζ3 ≈ 4/[3(mx/my) + 4].Copyright 1995, 1999 Academic Press, Inc.

Published
1995
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