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Reactions of alkaline earth ions with H_2, D_2, and HD

Dalleska, N. F. and Crellin, Kevin C. and Armentrout, P. B. (1993) Reactions of alkaline earth ions with H_2, D_2, and HD. Journal of Physical Chemistry, 97 (13). pp. 3123-3128. ISSN 0022-3654.

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Guided ion beam mass spectrometry is used to study the kinetic energy dependence of the reactions of ground-state Mg^+ and Sr^+ with molecular hydrogen and its isotopomers. The results for reactions of Sr^+ are analogous to those previously observed for reactions of Ca^+ and Ba^+ with H_2, D_2, and HD. We observe qualitatively different cross sections for the reactions of Mg^+ with H_2, D_2, and HD, even though the monopositive ions in this group all have an ns valence electron configuration above completely filled core orbitals. The different pattern of reactivity can be explained with molecular orbital concepts, focusing on the interaction of the empty orbitals of the reactant ion with those of the hydrogen molecule. The threshold behavior of these reactions is analyzed to yield 0 K bond dissociation energies for SrH^+ of 2.17 ± 0.06 eV (50.0±f 1.3 kcal/mol) and an estimate for MgH^+ of 1.94 ± 0.06 eV (44.7 ± 1.5 kcal/mol).

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Dalleska, N. F.0000-0002-2059-1587
Alternate Title:Reactions of alkaline earth ions with hydrogen, deuterium, and hydrogen deuteride
Additional Information:© 1993 American Chemical Society. Received: October 27, 1992; In Final Form: January 4, 1993. This work is supported by the National Science Foundation, Grant CHE 8917980 and 9221241.
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Camille and Henry Dreyfus FoundationUNSPECIFIED
Issue or Number:13
Record Number:CaltechAUTHORS:20150622-144459311
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Official Citation:Reactions of alkaline earth ions with hydrogen, deuterium, and hydrogen deuteride N. F. Dalleska, Kevin C. Crellin, and P. B. Armentrout The Journal of Physical Chemistry 1993 97 (13), 3123-3128 DOI: 10.1021/j100115a010
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58425
Deposited By: George Porter
Deposited On:23 Jun 2015 16:41
Last Modified:03 Oct 2019 08:35

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