Shockgas-ir: a high-temperature and high-pressure absorption cross-section database

Strand, Christopher L.

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https://hdl.handle.net/2142/107487 Copy

Description

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

Issue Date

2020-06-26

Keyword(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

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/107487

Copyright and License Information

Copyright 2020 is held by the Author(s)

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