Quadrupole splittings in the near-infrared spectrum of 14NH3

Twagirayezu, Sylvestre; Hall, Gregory E.; Sears, Trevor J.

doi:10.1063/1.4964484

Title: Quadrupole splittings in the near-infrared spectrum of ¹⁴NH₃

Journal Article · Thu Oct 13 00:00:00 EDT 2016 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4964484· OSTI ID:1328384

Twagirayezu, Sylvestre ^[1]; Hall, Gregory E. ^[2]; Sears, Trevor J. ^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States); Lamar Univ., Beaumont, TX (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)

Sub-Doppler, saturation dip, spectra of lines in the v₁ + v₃, v₁ + 2v₄ and v₃ + 2v₄ bands of ¹⁴NH₃ have been measured by frequency comb-referenced diode laser absorption spectroscopy. The observed spectral line widths are dominated by transit time broadening, and show resolved or partially-resolved hyperfine splittings that are primarily determined by the ¹⁴N quadrupole coupling. Modeling of the observed line shapes based on the known hyperfine level structure of the ground state of the molecule shows that, in nearly all cases, the excited state level has hyperfine splittings similar to the same rotational level in the ground state. The data provide accurate frequencies for the line positions and easily separate lines overlapped in Doppler-limited spectra. The observed hyperfine splittings can be used to make and confirm rotational assignments and ground state combination differences obtained from the measured frequencies are comparable in accuracy to those obtained from conventional microwave spectroscopy. Furthermore, several of the measured transitions do not show the quadrupole hyperfine splittings expected based on their existing rotational assignments. Either the assignments are incorrect or the upper levels involved are perturbed in a way that affects the nuclear hyperfine structure.

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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:: SC00112704; SC0012704

OSTI ID:: 1328384

Alternate ID(s):: OSTI ID: 1420726

Report Number(s):: BNL-112698-2016-JA; R&D Project: CO006; KC0301020; TRN: US1700159

Journal Information:: Journal of Chemical Physics, Vol. 145, Issue 14; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Cited By (3)

Communication: General variational approach to nuclear-quadrupole coupling in rovibrational spectra of polyatomic molecules Yachmenev, Andrey; Küpper, Jochen The Journal of Chemical Physics, Vol. 147, Issue 14 https://doi.org/10.1063/1.5002533	journal	October 2017
Frequency measurements and self-broadening of sub-Doppler transitions in the v1 + v3 band of C ₂ H ₂ Twagirayezu, Sylvestre; Hall, Gregory E.; Sears, Trevor J. The Journal of Chemical Physics, Vol. 149, Issue 15 https://doi.org/10.1063/1.5047410	journal	October 2018
Communication: General variational approach to nuclear-quadrupole coupling in rovibrational spectra of polyatomic molecules Yachmenev, Andrey; Küpper, Jochen Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2017-11260	text	January 2017

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Title: Quadrupole splittings in the near-infrared spectrum of 14NH3

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Title: Quadrupole splittings in the near-infrared spectrum of ¹⁴NH₃