The 1.66 μm spectrum of the ethynyl radical, CCH

Gross, Eisen C.; Le, Anh. T.; Hall, Gregory E.; Sears, Trevor J.

doi:10.1016/j.jms.2020.111404

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

Journal Article · Sun Dec 13 00:00:00 EST 2020 · Journal of Molecular Spectroscopy

DOI:https://doi.org/10.1016/j.jms.2020.111404· OSTI ID:1732147

Gross, Eisen C. ^[1]; Le, Anh. T. ^[2];

^[3]; Sears, Trevor J. ^[1]

Stony Brook Univ., NY (United States)
Arizona State Univ., Tempe, AZ (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; SC0018950

OSTI ID:: 1732147

Alternate ID(s):: OSTI ID: 1775981

Report Number(s):: BNL-220675-2020-JAAM; TRN: US2205152

Journal Information:: Journal of Molecular Spectroscopy, Vol. 376; ISSN 0022-2852

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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