Collisional broadening studies of infrared spectral lines of acetylene, ethylene and ammonia using a tunable diode laser spectrometer

Author

John F. Brannon

Date of Award

8-1991

Degree Type

Thesis

Degree Name

Master of Science

Major

Physics

Major Professor

William E. Blass

Committee Members

Stephen J. Daunt, Harry Jacobson

Abstract

The collisional broadening linewidths of acetylene, ethylene and ammonia, broadened by hydrogen and nitrogen, were measured in the 10-14µm region using a tunable diode laser spectrometer. Helium broadening measurements of ethylene were also made. The spectral lines of the ν₅ band of C₂H₂ were observed at room temperature, while the C₂H₂and NH₃ measurements were taken over a range of temperatures from 152 K to 295 K. The Lorentz half-widths were found from the observed Voigt profiles, and the collisional broadening coefficients were determined. Line intensities were also retrieved from the C₂H₂ Voigt profiles. Wing corrections were made, following the method of Fridovich, in both the C₂H₂broadening and intensity retrievals. Finally, the temperature dependence of the ethylene and ammonia broadening coefficients was determined.

Recommended Citation

Brannon, John F., "Collisional broadening studies of infrared spectral lines of acetylene, ethylene and ammonia using a tunable diode laser spectrometer. " Master's Thesis, University of Tennessee, 1991.
https://trace.tennessee.edu/utk_gradthes/12350