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Title:INVESTIGATION OF COLLISION-INDUCED RESONANCES IN NITRIC OXIDE USING TWO-COLOR POLARIZATION SPECTROSCOPY
Author(s):Chang, Ziqiao
Contributor(s):Lucht, Robert P. ; Satija, Aman
Subject(s):Lineshapes, collisional effects
Abstract:Polarization spectroscopy is a pump-probe technique that utilizes a change in the polarization of the probe beam, due to anisotropic Zeeman state populations created by the pump beam, in order to investigate the line shapes and line strengths of a target molecule. We have developed a two-color laser-induced polarization spectroscopy (TCPS) technique, with independent spectral tuning of the pump and probe beams, for investigating collision induced resonances (CIRs) in nitric oxide (NO). We distinguish CIRs from natural resonances (NRs), which occur when the transitions excited by pump and probe beams share a common upper and/or lower level. CIRs occur because of state-to-state rotational transfer during which the Zeeman state anisotropy is preserved to some extent. In these NO TCPS studies, a circularly-polarized pump beam is tuned to create a Zeeman state anisotropy in the A$^{2}$$\Sigma$$^{+}$-X$^{2}$$\Pi$ (0-0) band of NO molecules. A weak probe beam is then scanned over a range of transitions close to the pump frequency in order to probe NRs and CIRs. Gas mixtures of 1\% NO in the buffer gases N$_{2}$ (Fig. below), He, and Ar were selected for the experiments to investigate the dependence of CIR on collision species. The strongest CIRs were observed in the He buffer gas and the weakest CIRs were observed in the Ar buffer gas. The TCPS technique may also be used for species selective and transition selective NO measurements. \begin{wrapfigure}{l}{0pt} \includegraphics[scale=0.18]{2020_ISMS2.eps} \end{wrapfigure}
Issue Date:26-Jun-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/107393
Date Available in IDEALS:2020-06-26


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