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A determination of the stabilities of H<sup> + </sup><sub>3</sub>(H2)n with n=1–9 from measurements of the gas-phase ion equilibria H<sup> + </sup><sub>3</sub>(H2)n−1 +H2=H<sup> + </sup><sub>3</sub>(H2)n

J. Chem. Phys. 87, 4048 (1987); doi:10.1063/1.452909

Issue Date: 1 October 1987

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Kenzo Hiraoka
Faculty of Engineering, Yamanashi University, Takeda-4, Kofu 400, Japan
The equilibria of clustering reaction H<sup> + </sup><sub>3</sub>(H2)n−1 +H2=H<sup> + </sup><sub>3</sub>(H2)n were studied over the temperature range 330–25 K. The experiments were done with a pulsed electron–beam mass spectrometer. The ion source was thermostatted using a temperature-regulated cryocooler. The thermochemical stabilities of H<sup> + </sup><sub>3</sub>(H2)n with n=1–9 were determined. The ions H<sup> + </sup><sub>5</sub>, H<sup> + </sup><sub>9</sub>, H<sup> + </sup><sub>15</sub>, and H<sup> + </sup><sub>19</sub> are relatively more stable toward dissociation. The enthalpy changes for the clustering reaction yielding H<sup> + </sup><sub>5</sub> and H<sup> + </sup><sub>7</sub> were found to be in good agreement with the recent experimental study of Beuhler, Ehrenson, and Friedman, but in somewhat poor agreement with the earlier examination by Hiraoka and Kebarle. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 16 April 1987; accepted 24 June 1987
Permalink: http://link.aip.org/link/?JCPSA6/87/4048/1
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KEYWORDS and PACS

Keywords
PACS
  • 36.40.+d
    Studies of special atoms and molecules Atomic and molecular clusters
  • 82.60.Hc
    Physical chemistry Chemical thermodynamics Chemical equilibria and equilibrium constants
  • 82.30.Fi
    Physical chemistry Specific chemical reactions; reaction mechanisms Ionmolecule, ionion, and charge-transfer reactions
  • 82.80.Ms
    Physical chemistry Chemical analysis and related physical methods of analysis Mass spectrometry
  • YEAR: 1987

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
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