STIMULATED EMISSION SPECTROSC0PY OF $H_{2}CO$
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Date
1983
Journal Title
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Volume Title
Publisher
Ohio State University
Abstract
A new technique, Stimulated Emission Pumping (SEP), has been used to examine the rotation-vibration structure of the $\tilde{X} ^{1}A_{1}$ state of formaldehyde at energies up to $10^{4}$ $cm^{-1}$. A complete set of 21 $X_{ij}$ anharmonicity constants has been determined from a, b, and c-type $\tilde{A} \rightarrow \tilde{X}$ transitions from the $4^{1}$ level and from numerous Coriolis and Fermi perturbations. B and C rotational constants as well as dipole moments are observed for many highly excited levels of the $\tilde{X}$ state. Coriolis perturbations are extremely numerous at high vibrational excitation and the SEP technique makes their analysts trivial. Although nonrotating vibrational levels exhibit large and systematic structural differences, at J $\sim $ 10 and K $\sim$ 3 Coriolis mixing minimizes these differences so that all properties become locally averaged. This has important implications about the possibility of level-specific chemistry.
Description
Author Institution: Department of Chemistry, Massachusetts Institute of Technology