EXCITED-STATE TRANSITIONS IN TETRAHEDRAL MOLECULES
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Date
1974
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Ohio State University
Abstract
Pure rotational transitions in excited vibrational states of the ground electronic states were predicted for molecules of $T_{d}$ symmetry. Stark spectroscopy of methane demonstrated polarity in an excited state of P(7) in the triply-degenerate fundamental $\nu_{3}$. Subsequently, two $\Delta J = 0$ transitions were observed in this multiplet. The present work is an explicit generalization to excited states of all infrared-active transitions in $T_{d}$ molecules. Electric dipole moment expressions for excited vib-rot states will be given. Stark shifts of excited-state levels will be calculated. Experiments, such as those employing the coincidence of Er:YAG laser emission with methane absorption at $6077 cm^{-1}$, will be discussed.
Description
This research was supported, in part, by the rational Science Foundation, Grant GA-30713 and the Air Force Cambridge Research Laboratories, Contract No. F19628-72-C-0111. $^{1}$K. Fox, Appl. Phys. Letters 24, 24 (1974); and J. Chem. Phys., to be published (1974), where references to earlier work are given.
Author Institution: Department of Physics and Astronomy, The University of Tennessee
Author Institution: Department of Physics and Astronomy, The University of Tennessee