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Development of a HCl laser absorption diagnostic near 3.3 μm for shock-tube chemical kinetics studies.

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Title: Development of a HCl laser absorption diagnostic near 3.3 μm for shock-tube chemical kinetics studies.
Authors: Grégoire, Claire M.1 (AUTHOR) claire.gregoire@tamu.edu, Petersen, Eric L.1 (AUTHOR)
Source: Applied Physics B: Lasers & Optics. May2025, Vol. 131 Issue 5, p1-14. 14p.
Subjects: Shock tubes, Absorption coefficients, Shock waves, Chemical kinetics, Hydrogen chloride
Abstract: A new hydrogen chloride (HCl) laser absorption diagnostic was developed and combined with a shock tube to obtain HCl time-history profiles behind reflected shock waves. An interband cascade laser was used to access the R(8) transition lines of the two isotopes H35Cl and H37Cl in the fundamental (1 ← 0) band at the specific wavelengths of 3045.06 and 3042.74 cm−1 near 3.3 μm, respectively. Spectroscopic parameters were obtained using HCl in 99.5% Ar, focusing on the line strengths and Ar-broadening effects, and were compared with theory from the literature. Experimental calibration of the HCl absorption coefficient and its dependence over a wide range of temperatures and pressures were obtained (i.e. 1261—1759 K, 0.25—0.42 atm, and 2390—3736 K, 1.26—2.00 atm). Measurements of the line strengths, Ar-broadening parameters at 296 K, and temperature-dependence exponents for the R(8) transition lines of H35Cl and H37Cl were validated against these results and can be summarized as follows: For H35Cl: S 12 T 0 = 2.099 ± 0.084 cm−2-atm−1, γ H 35 C l - A r T 0 = 0.0110 ± 0.0005 cm−1-atm−1, and n H 35 C l - A r = 0.4 ± 0.01. For H37Cl: S 12 T 0 = 0.708 ± 0.028 cm−2-atm−1, γ H 37 C l - A r T 0 = 0.0105 ± 0.0005 cm−1-atm−1, and n H 37 C l - A r = 0.3 ± 0.01. The new HCl laser probe shows promising results for future measurements to better understand the combustion chemistry of propellants containing chlorine. [ABSTRACT FROM AUTHOR]
Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Development of a HCl laser absorption diagnostic near 3.3 μm for shock-tube chemical kinetics studies.
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  Data: <searchLink fieldCode="AR" term="%22Grégoire%2C+Claire+M%2E%22">Grégoire, Claire M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> claire.gregoire@tamu.edu</i><br /><searchLink fieldCode="AR" term="%22Petersen%2C+Eric+L%2E%22">Petersen, Eric L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Applied+Physics+B%3A+Lasers+%26+Optics%22">Applied Physics B: Lasers & Optics</searchLink>. May2025, Vol. 131 Issue 5, p1-14. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Shock+tubes%22">Shock tubes</searchLink><br /><searchLink fieldCode="DE" term="%22Absorption+coefficients%22">Absorption coefficients</searchLink><br /><searchLink fieldCode="DE" term="%22Shock+waves%22">Shock waves</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+chloride%22">Hydrogen chloride</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A new hydrogen chloride (HCl) laser absorption diagnostic was developed and combined with a shock tube to obtain HCl time-history profiles behind reflected shock waves. An interband cascade laser was used to access the R(8) transition lines of the two isotopes H35Cl and H37Cl in the fundamental (1 ← 0) band at the specific wavelengths of 3045.06 and 3042.74 cm−1 near 3.3 μm, respectively. Spectroscopic parameters were obtained using HCl in 99.5% Ar, focusing on the line strengths and Ar-broadening effects, and were compared with theory from the literature. Experimental calibration of the HCl absorption coefficient and its dependence over a wide range of temperatures and pressures were obtained (i.e. 1261—1759 K, 0.25—0.42 atm, and 2390—3736 K, 1.26—2.00 atm). Measurements of the line strengths, Ar-broadening parameters at 296 K, and temperature-dependence exponents for the R(8) transition lines of H35Cl and H37Cl were validated against these results and can be summarized as follows: For H35Cl: S 12 T 0 = 2.099 ± 0.084 cm−2-atm−1, γ H 35 C l - A r T 0 = 0.0110 ± 0.0005 cm−1-atm−1, and n H 35 C l - A r = 0.4 ± 0.01. For H37Cl: S 12 T 0 = 0.708 ± 0.028 cm−2-atm−1, γ H 37 C l - A r T 0 = 0.0105 ± 0.0005 cm−1-atm−1, and n H 37 C l - A r = 0.3 ± 0.01. The new HCl laser probe shows promising results for future measurements to better understand the combustion chemistry of propellants containing chlorine. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s00340-025-08458-3
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        Text: English
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      – SubjectFull: Absorption coefficients
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      – SubjectFull: Shock waves
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      – SubjectFull: Chemical kinetics
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            – D: 01
              M: 05
              Text: May2025
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              Y: 2025
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