MICROWAVE SPECTRUM OF FORMALDEHYDE IN VIBRATIONALLY EXCITED STATES
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Date
1964
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Ohio State University
Abstract
Thorough sweeps of the spectral lines of $H_{2}CO$ and $D_{2}CO$ in the frequency region from 8000 Me to 36,000 Me have been made at room temperature as well as at $200^{\circ} C$. The K-type doubling lines of these molecules in the first excited states of $\nu_{2} (C = O stretching), \nu_{2} (HCH angle deformation), \nu_{5} (CH_{2} in-plane bending)$ and $\nu_{6} (CH_{2} out-of-plane bending)$ vibrations with K = 1 and K = 2 have been assigned. The spectral lines of the $1_{01}\leftarrow 0_{00}$ transitions of these excited states which appear in the millimeter wave region have been also observed. By fitting these observed lines to the asymmetric rotor energy levels, the effective rotational constants of formaldehyde in the excited states have been determined. The observed inertia defects of the excited states agreed fairly well with the theoretical values. The excited state lines could not always be fitted to the asymmetric rotor energy levels because of the strong vibrationrotation interaction. The effect of strong Coriolis interaction on the frequencies of the K-type doubling lines is discussed.
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$^{\dag}$ Present address: Division of Pure Physics, National Research Council, Ottawa 2, Canada.
Author Institution: Department of Chemistry, Faculty of Science
Author Institution: Department of Chemistry, Faculty of Science