Velocity modulation infrared laser spectroscopy of molecular ions: The v4 band of ammonium

Mark Polak; Martin Gruebele; Bruce W. DeKock; Richard J. Saykally

doi:10.1080/00268978900100801

Velocity modulation infrared laser spectroscopy of molecular ions: The v₄ band of ammonium

Mark Polak, Martin Gruebele, Bruce W. DeKock, Richard J. Saykally

Research output: Contribution to journal › Article › peer-review

Abstract

We have measured 62 lines in the v₄ band of the ammonium ion (NH⁺₄) using infrared diode laser velocity modulation spectroscopy of a hydrogen/ammonia discharge. The transitions were fitted to a fourth order spherical rotor hamiltonian yielding v₄ = 1447.2158(50) cm^-1, B₄ = 5-85121(24)cm^-1 and 2B₄ζ₄ = 5-3757(11)cm^-1. As in methane, the v₄ band is strongly perturbed by the higher frequency v₂ band. A comparison of the measured molecular properties with ab initio calculations is given.

Original language	English (US)
Pages (from-to)	1193-1202
Number of pages	10
Journal	Molecular Physics
Volume	66
Issue number	6
DOIs	https://doi.org/10.1080/00268978900100801
State	Published - Apr 20 1989
Externally published	Yes

ASJC Scopus subject areas

Biophysics
Molecular Biology
Condensed Matter Physics
Physical and Theoretical Chemistry

Online availability

10.1080/00268978900100801

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Cite this

@article{feccb39b0d18475bb5d7998048ec589b,

title = "Velocity modulation infrared laser spectroscopy of molecular ions: The v4 band of ammonium",

abstract = "We have measured 62 lines in the v4 band of the ammonium ion (NH+4) using infrared diode laser velocity modulation spectroscopy of a hydrogen/ammonia discharge. The transitions were fitted to a fourth order spherical rotor hamiltonian yielding v4 = 1447.2158(50) cm-1, B4 = 5-85121(24)cm-1 and 2B4ζ4 = 5-3757(11)cm-1. As in methane, the v4 band is strongly perturbed by the higher frequency v2 band. A comparison of the measured molecular properties with ab initio calculations is given.",

author = "Mark Polak and Martin Gruebele and DeKock, {Bruce W.} and Saykally, {Richard J.}",

note = "Funding Information: This work was supported by the National Science Foundation (Grant No. CHE-8612296). The authors would also like to thank H. S. Johnston for the loan of a laser diode.",

year = "1989",

month = apr,

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doi = "10.1080/00268978900100801",

language = "English (US)",

volume = "66",

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journal = "Molecular Physics",

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publisher = "Taylor and Francis Ltd.",

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T1 - Velocity modulation infrared laser spectroscopy of molecular ions

T2 - The v4 band of ammonium

AU - Polak, Mark

AU - Gruebele, Martin

AU - DeKock, Bruce W.

AU - Saykally, Richard J.

N1 - Funding Information: This work was supported by the National Science Foundation (Grant No. CHE-8612296). The authors would also like to thank H. S. Johnston for the loan of a laser diode.

PY - 1989/4/20

Y1 - 1989/4/20

N2 - We have measured 62 lines in the v4 band of the ammonium ion (NH+4) using infrared diode laser velocity modulation spectroscopy of a hydrogen/ammonia discharge. The transitions were fitted to a fourth order spherical rotor hamiltonian yielding v4 = 1447.2158(50) cm-1, B4 = 5-85121(24)cm-1 and 2B4ζ4 = 5-3757(11)cm-1. As in methane, the v4 band is strongly perturbed by the higher frequency v2 band. A comparison of the measured molecular properties with ab initio calculations is given.

AB - We have measured 62 lines in the v4 band of the ammonium ion (NH+4) using infrared diode laser velocity modulation spectroscopy of a hydrogen/ammonia discharge. The transitions were fitted to a fourth order spherical rotor hamiltonian yielding v4 = 1447.2158(50) cm-1, B4 = 5-85121(24)cm-1 and 2B4ζ4 = 5-3757(11)cm-1. As in methane, the v4 band is strongly perturbed by the higher frequency v2 band. A comparison of the measured molecular properties with ab initio calculations is given.

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