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Title: Suppressed-Doppler slit jet infrared spectroscopy of astrochemically relevant cations: $$ν_1$$ and $$ν_4$$ NH stretching modes in NH3D+

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5113962· OSTI ID:1610628

A suppressed-Doppler (Δν = 180 MHz) infrared spectrum of monodeuterated ammonium ions (NH3D+) has been obtained for the ν1 (symmetric) and ν4 (degenerate) N–H stretch bands via direct absorption high resolution IR laser spectroscopy in a planar slit jet discharge expansion. The ion is efficiently generated by H3+ protonation of NH2D in a discharge mixture of H2/NH2D, with the resulting expansion rapidly cooling the molecular ions into low rotational states. The first high-resolution infrared spectrum of ν1 is reported, as well as many previously unobserved transitions in the ν4 rovibrational manifold. Simultaneous observation of both ν1 and ν4 permits elucidation of both the vibrational ground and excited state properties of the ion, including rigorous benchmarking of band origins against high-level anharmonic ab initio theory as well as determination of the ν14 intensity ratio for comparison with bond-dipole model predictions. Ground-state combination differences from this work and earlier studies permit the rotational constants of NH3D+ to be determined to unprecedented accuracy, the results of which support previous laboratory and astronomical assignment of the 10–00 pure rotational transition and should aid future searches for other rotational transitions as well.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
SC0002123; FG02-09ER16021; CHE 1665271; PHY 1734006
OSTI ID:
1610628
Alternate ID(s):
OSTI ID: 1558705; OSTI ID: 1924531
Journal Information:
Journal of Chemical Physics, Vol. 151, Issue 8; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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