AN UNUSUAL INTERNAL ROTATION: THE THREE-MINIMA MOTION OF AR IN TRIFLUOROMETHANE-AR
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Date
2002
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The rotational spectrum of Trifluoromethane-Ar ($CHF_{3}$-Ar, see Fig. on the right) has been observed by free jet absorption millimeter wave spectroscopy. The near prolate top spectrum of the adduct suggests that: i) the location of Ar is out of the $C_{3v}$ axis of $CHF_{3}$; ii) the barrier to internal rotation of Ar is not negligible. The rotational lines are split in equally intense A E component lines for the low $K_{-1}$ transitions, and in triplets lines for the high $K_{-1}$, transitions (doubly overlapped because of the near prolate degeneracy) with intensities 2:1:1 for $A:E^{+}:E^{-}$ components. Such a behaviour is in accord with Hersbach theory for internal $rotation.^{a}$. [FIGURE]
Description
$^{a}$D. R. Herschbach and J. D. Swalen J. Chem. Phys. 29, 761 (1958).
Author Institution: Dipartimento di Chimica ``G.Ciamician'', Universita' di Bologna
Author Institution: Dipartimento di Chimica ``G.Ciamician'', Universita' di Bologna