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

Farooq, Aamir

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

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

Language

eng

Handle URL

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

DOI

https://doi.org/10.15278/isms.2022.RH07

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Copyright 2022 held by the authors

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