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The vibrational predissociation spectroscopy of hydrogen cluster ions

Okumura, M. and Yeh, L. I. and Lee, Y. T. (1985) The vibrational predissociation spectroscopy of hydrogen cluster ions. Journal of Chemical Physics, 83 (7). pp. 3705-3706. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:OKUjcp85

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Abstract

The first infrared spectra of protonated hydrogen clusters in the gas phase have been observed. Predissociation spectra were taken with a tandem mass spectrometer: mass selected hydrogen cluster ions were irradiated inside a rf ion trap by a tunable infrared laser, and the fragment ions created by photodissociation of the clusters were mass selected and detected. Spectra for each product channel were measured by counting fragment ions as a function of laser frequency. Low resolution spectra (Deltanu=10 cm^−1) in the region from 3800 to 4200 cm^−1 were observed for the ions H<sup> + </sup><sub>5</sub>, H<sup> + </sup><sub>7</sub>, and H<sup> + </sup><sub>9</sub> at 3910, 3980, and 4020 cm−1, respectively. A band was also observed for H<sup> + </sup><sub>5</sub> at 3532 cm^−1. No rotational structure was resolved. The frequencies of the band maxima agree well with the frequencies predicted by previous ab initio calculations for the highest modes.


Item Type:Article
Additional Information:Copyright © 1985 American Institute of Physics. Received 28 June 1985; accepted 18 July 1985. We would like to thank J.F. Gaw, Y. Yamaguchi, and H.F. Schaefer III for providing use with results of unpublished calculations. Supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Chemical Sciences Division of Department of Energy, under Contract No. DE-AC-3-76SF00098. The F-center laser was on loan from the San Francisco Laser Center, a National Science Foundation Regional Instrumentation Facility, NSF Grant No. CHE79-16250 awarded to the University of California at Berkeley in collaboration with Stanford University. [L.I.Y. was an] NSF Predoctoral Fellow.
Subject Keywords:VIBRATIONAL STATES, PREDISSOCIATION, HYDROGEN IONS, INFRARED SPECTRA, MOLECULAR IONS, AGGLOMERATION, MOLECULAR CLUSTERS
Record Number:CaltechAUTHORS:OKUjcp85
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:OKUjcp85
Alternative URL:http://dx.doi.org/10.1063/1.449127
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10227
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:17 Apr 2008
Last Modified:26 Dec 2012 09:58

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