Observation of the 2. nu. sub 2 ( l =2) l arrow 0 overtone band of H sup + sub 3

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458990· OSTI ID:6230070

Xu, L; Gabrys, C; Oka, T ^[1]

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1. Department of Chemistry, The University of Chicago, Chicago, IL (USA) Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL (USA)

The overtone band of 2{nu}{sub 2}({ital l}=2){l arrow}0 of H{sup +}{sub 3} in the 2 {mu}m infrared region has been observed in absorption by using a difference frequency laser spectrometer. The LiIO{sub 3} nonlinear optical system assembled by Bawendi and the bidirectional multiple path optical arrangement with velocity modulation have enabled us to observe 34 vibrational--rotation transitions from 5094 to 4557 cm{sup {minus}1}. Liquid-N{sub 2} cooled plasmas were used for transitions involving low rotational levels, while gaseous-N{sub 2} cooled plasmas were used for high rotational levels, up to {ital J},{ital K}=(9,9). From the relative intensities of the transitions, rotational temperature has been estimated to be {similar to}270 K for the former and {similar to}1300 K for the latter. The {Delta}{vert bar}{ital k}{minus}{ital l}{vert bar}={plus minus}3 selection rule of the overtone band allows us to determine the absolute energy level values by combining the frequencies of the overtone band with those of the fundamental and hot bands.

• OSTI ID: 6230070
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 93:9; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
CATIONS
CHARGED PARTICLES
ENERGY LEVELS
EXCITED STATES
HARMONICS
HYDROGEN IONS
INFRARED SPECTRA
IONS
MOLECULAR IONS
OSCILLATIONS
SPECTRA
VIBRATIONAL STATES