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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: 2018-08-172018-12-12
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