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Collision Broadening of Microwave Spectral Lines of Monomeric Formaldehyde and Formic Acid

Line width parameters for a number of spectral lines in the pure rotational spectrum of formaldehyde (CH20) and formic acid (HCOOH) have been measured using a sourcemodulated microwave spectrograph. All transitions studied in this investigation were of the type ΔJ=O (i.e. Q-branch transitions), with ΔK-1=0 and ΔK+1 =+l. The center frequencies of the measured lines varied from 8662.0 MHz to 48612.70 MHz. The experimentally determined collision diameters for self broadening interactions involving HCOOH and CH2 Q molecules were found to be 2 - 27 per cent less than those calculated by the Murphy-Boggs theory of collision broadening. Much better agreement between a simplified broadening scheme for symmetric top molecules and the observed foreign-gas collision diameters is obtained by using Birnbaum's theory.

Identiferoai:union.ndltd.org:unt.edu/info:ark/67531/metadc500522
Date08 1900
CreatorsVenkatachar, Arun C.
ContributorsRoberts, James A., Redding, Rogers W., Mackey, Henry J., Deering, William D., McIntyre, Bernard J.
PublisherNorth Texas State University
Source SetsUniversity of North Texas
LanguageEnglish
Detected LanguageEnglish
TypeThesis or Dissertation
Formatvi, 105 leaves : ill., Text
RightsPublic, Venkatachar, Arun C., Copyright, Copyright is held by the author, unless otherwise noted. All rights reserved.

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