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Combination band spectroscopy of H<sub>3</sub><sup>+</sup>

J. Chem. Phys. 113, 3104 (2000); doi:10.1063/1.1287142

Issue Date: 22 August 2000

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Benjamin J. McCall and Takeshi Oka
Department of Chemistry, Department of Astronomy & Astrophysics, and the Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637
Thirty rovibrational transitions of H<sub>3</sub><sup>+</sup> have been observed near 1.25 µm using a tunable diode laser and a positive column discharge. In addition to the H<sub>3</sub><sup>+</sup> transitions, over 200 transitions between Rydberg states of H2 were observed—these could be discriminated against by using a discharge dominated by He, which apparently collisionally quenches the Rydberg states of H2 without affecting H<sub>3</sub><sup>+</sup>. Twenty-eight of the H<sub>3</sub><sup>+</sup> transitions have been assigned to the nu1 + 2nu<sub>2</sub><sup>2</sup><--0 band, and provide experimentally determined energy levels for most of the levels up to J = 4 in the nu1 + 2nu<sub>2</sub><sup>2</sup> state. The remaining two H<sub>3</sub><sup>+</sup> transitions have been assigned to the 2nu1 + nu2<--0 band. These bands represent a crucial test of ab initio calculations, as they reach higher vibrational levels of H<sub>3</sub><sup>+</sup> than any yet observed. We have compared our experimental results with recent variational calculations by several groups. ©2000 American Institute of Physics.
History: Received 9 May 2000; accepted 25 May 2000
Permalink: http://link.aip.org/link/?JCPSA6/113/3104/1
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Supplemental Material

KEYWORDS and PACS

Keywords
PACS
  • 33.20.Ea
    Molecular properties and interactions with photons Molecular spectra Infrared spectra
  • 31.15.Ar
    Electronic structure of atoms, molecules and their ions: theory Calculations and mathematical techniques in atomic and molecular physics (excluding electron correlation calculations) Ab initio calculations
  • 33.15.Mt
    Molecular properties and interactions with photons Properties of molecules and molecular ions Rotation, vibration, and vibration–rotation constants
  • 33.20.Vq
    Molecular properties and interactions with photons Molecular spectra Vibration–rotation analysis
  • 31.50.+w
    Electronic structure of atoms, molecules and their ions: theory Excited states
  • YEAR: 2000

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (39)
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