University of Illinois Urbana-Champaign

Pressure And Temperature Dependence Of Absorption Cross-section Of Hcn In The Long-wave Mid-infrared Region

Farooq, Aamir

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RH07_1.pptx
6019.pdf

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https://hdl.handle.net/2142/116984

Description

Title
Pressure And Temperature Dependence Of Absorption Cross-section Of Hcn In The Long-wave Mid-infrared Region
Author(s)
Farooq, Aamir
Contributor(s)
  • Giri, Binod
  • Marangoni, Marco
  • Shakfa, Mohammad Khaled
  • Alsulami, Ahmed Ayidh
  • Abualsaud, Nawaf
  • Mhanna, Mhanna
  • Adil, Mohammad
  • Elkhazraji, Ali
Issue Date
2022-06-23
Keyword(s)
Mini-symposium: Spectroscopy meets Chemical Dynamics
Abstract
Hydrogen cyanide (HCN) is extensively studied in combustion and exoplanetary research for its important role in both fields. Laser-based detection of HCN in both fields, among other applications, necessitates quantifying the pressure and temperature dependence of its absorption cross-section. Here, we introduce a method to access HCN’s strongest IR band, \nub{2}, near 712 \wn \(via\) a high-resolution custom-designed laser source. Difference-frequency generation (DFG) between a cw EC-QCL and a pulsed \chem{CO_2} gas laser in an orientation-patterned GaAs crystal is employed to generate laser light in the long-wavelength mid-IR region. The DFG laser can be wavelength-tuned over 667 - 865 \wn. We employed our DFG laser to quantify the pressure dependence of absorption cross-section of the Q-branch of the \nub{2} band of HCN over the range 100 - 800 Torr. Furthermore, we exploited the developed laser source in conjunction with a shock tube to measure the temperature dependence of absorption cross-section of the peak of the Q-branch behind reflected shock waves over the temperature range 850 - 3000 K. We compared our results with HITRAN simulations. Ultimately, we utilized these results in measuring HCN formation time-histories in a reactive environment behind reflected shock waves.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/116984
DOI
https://doi.org/10.15278/isms.2022.RH07
Copyright and License Information
Copyright 2022 held by the authors

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Abstracts & Presentations - 2022 International Symposium on Molecular Spectroscopy PRIMARY