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Title:SHIFTS AND BROADENING IN THE CN A 2Π− X 2Σ+ (2-0) BAND INDUCED BY ARGON COLLISIONS
Author(s):Lockhart, James
Contributor(s):Hall, Gregory; Sears, Trevor
Subject(s):Linelists, Lineshapes, Collisions
Abstract:Selected P-and R-branch transitions of the CN A\,$^{2}\Pi -X\,^{2}\Sigma^{+}$ (2-0) band have been recorded at room temperature as a function of argon pressure, using frequency modulation spectroscopy. The experimental line shapes have been successfully fit using a Quadratic Speed-Dependent Voigt (QSDV) model at total pressures ranging from 1 - 160 Torr. The pressure broadening coefficients derived from the QSDV analysis are nearly independent of the rotational quantum state and rotational branch. The pressure-dependence of the line shifts, in contrast, displays a distinctive variation with rotational state and branch, with larger and strongly J-dependent shifts for P-branch lines, compared to smaller and more J-independent shifts for R-branch lines. The pressure-induced shifts provide a challenge to first principles scattering calculations on validated potential energy surfaces. Previously puzzling measurements on fewer lines in the (1-0) band are confirmed and extended by the present measurements. \small Work at Brookhaven National Laboratory was carried out under Contract No. DE-SC0012704 with the U.S. Department of Energy, Office of Science, and supported by its Division of Chemical Sciences, Geosciences and Biosciences within the Office of Basic Energy Sciences.
Issue Date:06/18/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100526
DOI:10.15278/isms.2018.MI10
Other Identifier(s):MI10
Date Available in IDEALS:2018-08-17
2018-12-12


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