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Title: The 1.66 μm spectrum of the ethynyl radical, CCH

Abstract

Frequency-modulated diode laser transient absorption spectra of the ethynyl radical have been recorded at wavelengths close to 1.66 μm. The observed spectrum includes strong, regular, line patterns. The two main bands observed originate in the ground $$\tilde{χ}$$2Σ+ state and its first excited bending vibrational level of 2$$Π$$ symmetry. The upper states, of 2Σ+ symmetry at 6055.6 cm-1 and 2$$Π$$ symmetry at 6413.5 cm-1, respectively, had not previously been observed and the data were analyzed in terms of an effective Hamiltonian representing their rotational and fine structure levels to derive parameters which can be used to calculate rotational levels up to J = 37/2 for the 2$$Π$$ level and J = 29/2 for the 2Σ one. Additionally, a weaker series of lines have been assigned to absorption from the second excited bending, (0 2 0), level of 2Σ symmetry, to a previously observed state of 2$$Π$$ symmetry near 6819 cm-1. These strong absorption bands at convenient near-IR laser wavelengths will be useful for monitoring CCH radicals in chemical systems.

Authors:
 [1];  [2]; ORCiD logo [3];  [1]
+ Show Author Affiliations
  1. Stony Brook Univ., NY (United States)
  2. Arizona State Univ., Tempe, AZ (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1732147
Alternate Identifier(s):
OSTI ID: 1775981
Report Number(s):
BNL-220675-2020-JAAM
Journal ID: ISSN 0022-2852; TRN: US2205152
Grant/Contract Number:  
SC0012704; SC0018950
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Molecular Spectroscopy
Additional Journal Information:
Journal Volume: 376; Journal ID: ISSN 0022-2852
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; Free Radical Spectra; Laser Spectroscopy; Ethynyl; C2Hl; Rotational Hamiltonian

Citation Formats

Gross, Eisen C., Le, Anh. T., Hall, Gregory E., and Sears, Trevor J. The 1.66 μm spectrum of the ethynyl radical, CCH. United States: N. p., 2020. Web. doi:10.1016/j.jms.2020.111404.
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Gross, Eisen C., Le, Anh. T., Hall, Gregory E., & Sears, Trevor J. The 1.66 μm spectrum of the ethynyl radical, CCH. United States. https://doi.org/10.1016/j.jms.2020.111404
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Gross, Eisen C., Le, Anh. T., Hall, Gregory E., and Sears, Trevor J. Sun . "The 1.66 μm spectrum of the ethynyl radical, CCH". United States. https://doi.org/10.1016/j.jms.2020.111404. https://www.osti.gov/servlets/purl/1732147.
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@article{osti_1732147,
title = {The 1.66 μm spectrum of the ethynyl radical, CCH},
author = {Gross, Eisen C. and Le, Anh. T. and Hall, Gregory E. and Sears, Trevor J.},
abstractNote = {Frequency-modulated diode laser transient absorption spectra of the ethynyl radical have been recorded at wavelengths close to 1.66 μm. The observed spectrum includes strong, regular, line patterns. The two main bands observed originate in the ground $\tilde{χ}$2Σ+ state and its first excited bending vibrational level of 2$Π$ symmetry. The upper states, of 2Σ+ symmetry at 6055.6 cm-1 and 2$Π$ symmetry at 6413.5 cm-1, respectively, had not previously been observed and the data were analyzed in terms of an effective Hamiltonian representing their rotational and fine structure levels to derive parameters which can be used to calculate rotational levels up to J = 37/2 for the 2$Π$ level and J = 29/2 for the 2Σ one. Additionally, a weaker series of lines have been assigned to absorption from the second excited bending, (0 2 0), level of 2Σ symmetry, to a previously observed state of 2$Π$ symmetry near 6819 cm-1. These strong absorption bands at convenient near-IR laser wavelengths will be useful for monitoring CCH radicals in chemical systems.},
doi = {10.1016/j.jms.2020.111404},
journal = {Journal of Molecular Spectroscopy},
number = ,
volume = 376,
place = {United States},
year = {Sun Dec 13 00:00:00 EST 2020},
month = {Sun Dec 13 00:00:00 EST 2020}
}
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