Collisional Broadening of Spectral Lines in the X → b System of O2 and the First Vibrational Band of NO by the Noble Gases

Author

John J. Cornicelli

Date of Award

12-1997

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Engineering Physics

First Advisor

Paul J. Wolf, PhD

Abstract

Collisional broadening of the rotational spectral lines of the X to b system of O₂ and the first vibrational band of NO by the noble gases is examined by Fourier transform spectroscopy. Peaks of the individual rotational lines are modeled with a Voigt function, from which Lorentzian half widths are extracted. Lorentzian widths are plotted vs. pressure of foreign gas, from which the pressure broadening coefficients and pressure broadening cross sections are calculated. The pressure broadening coefficients are compared to theoretical values determined by past research for O₂. NO coefficients are compared to similar research using N₂ as collision partner. O₂ broadening coefficients/cross sections were found to increase with decreasing rotational quantum number. Also, a linear dependence is found between cross section and both polarizability of the collision partner and reduced mass of the collision pair.

AFIT Designator

AFIT-ENP-GAP-97D-01

DTIC Accession Number

ADA335199

Comments

Plain-text title form: Collisional Broadening of Spectral Lines in the X --> b System of O2 and the First Vibrational Band of NO by the Noble Gases

Recommended Citation

Cornicelli, John J., "Collisional Broadening of Spectral Lines in the X → b System of O2 and the First Vibrational Band of NO by the Noble Gases" (1997). Theses and Dissertations. 5605.
https://scholar.afit.edu/etd/5605