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Title:SHOCKGAS-IR: A HIGH-TEMPERATURE AND HIGH-PRESSURE ABSORPTION CROSS-SECTION DATABASE
Author(s):Strand, Christopher L
Contributor(s):Hanson, Ronald K; Su, Wey-Wey ; Johnson, Sarah E; Ding, Yiming
Subject(s):Intensities, transition moments, cross sections
Abstract:\begin{wrapfigure}{l}{0pt} \includegraphics[scale=0.28]{Illustrative_Spectra_1000K_Square.eps} \end{wrapfigure} An infrared absorption cross-section database for gas-phase molecules at high-temperatures and high-pressures is under construction to address a growing cross-disciplinary need for experimental data at these conditions. Recently developed broad-scan, rapid-tuning external-cavity quantum cascade lasers (QCL) have enabled the application of shock tube facilities, commonly used to study high-temperature chemical kinetics, to the efficient acquisition of absorption spectra under short-duration shock-heated test gas conditions. Available shock tube facilities can produce temperatures from 500 to 10,000 K and pressures from 0.1 to 1000 atm with test time durations ranging from 500 $\mu$s to 50 ms. Uncertainties in the known thermodynamic conditions as low as $\pm$1\% can be achieved. Presently available laser systems enable the rapid acquisition ($<$ 10 ms) of approximately 300 cm$^{-1}$ wide spectral regions at any location within the QCL-accessible wavelength region of 3.6 -11.7 $\mu$m (850 - 2800 cm$^{-1}$). The resulting spectra are composed of discrete data points at a spectral interval ranging from 0.3 - 0.6 cm$^{-1}$ and an instrument broadening function defined by the laser linewidth ($\leq$ 0.0033 cm$^{-1}$). Present efforts are focused on studying large polyatomic molecules (4+ atoms) dilute in a bath gas of argon under conditions for which dissociation is negligible and test time durations are favorable (T $<$ 1600K and P $<$ 5atm). The database currently includes ethylene, methanol, and ethanol with over a dozen more species measured and being prepared for inclusion soon. Database permanent URL: https://purl.stanford.edu/cy149sv5686
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/2142/107487
Date Available in IDEALS:2020-06-26


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