Line Mixing Study On The Nitric Oxide Fundamental Band Near 5.3 Microns

Su, Wey-Wey

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https://hdl.handle.net/2142/111329 Copy

Description

Title

Line Mixing Study On The Nitric Oxide Fundamental Band Near 5.3 Microns

Author(s)

Su, Wey-Wey

Contributor(s)

• Hanson, Ronald K
• Strand, Christopher L
• Ding, Yiming
• Almodovar, Christopher

Issue Date

2021-06-22

Keyword(s)

Lineshapes, collisional effects

Abstract

\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.52]{Hartmann_XiMult2_1m2xi_result_forISMS.eps} \end{wrapfigure} We present absorbance measurements of the full fundamental ro-vibrational band of nitric oxide in nitrogen bath (NO/N$_2$) from 1700 to 2000 cm$^{-1}$ at pressure and temperature conditions of 20-34 atm and 293-802 K, respectively. These measurements were taken with a narrow-linewidth, broad-scan EC-QCL laser aligned through a high-pressure, high-temperature static cell. The results were compared to a line mixing model utilizing relaxation matrix formalism and the modified exponential gap (MEG) fitting law that was previously developed using absorbance measurements limited to the R-branch\footnote{Almodovar, C.A., ``Infrared Laser Absorption Spectroscopy of Nitric Oxide for Sensing in High-Enthalpy Air,'' Ph.D. diss., (Stanford University, 2019)}. Improved knowledge from full-band absorbance measurements, including the P and Q-branches, indicates the need to account for inter-branch line mixing effects which were omitted in the previous model. A modified MEG line mixing model is presented with additional inter-branch coupling transfer rates and their associated scaling factors, showing stronger agreement with the measured spectra.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111329

DOI

10.15278/isms.2021.TM02

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