Spectroscopic identification of higher-order rare gas-dihalogen complexes with different geometries: He2,3...Br2 and He 2,3.....ICl

David S. Boucher, Joshua P. Darr, David B. Strasfeld, Richard A. Loomis

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Rovibronic transitions of multiple conformers of the He2..... 79Br2X, v = 0), He3....79Br 2(X, v = 0), He2...I35Cl(X, v = 0), and He 3.....I35Cl(X, v = 0) complexes stabilized in a pulsed, supersonic expansion are observed in action spectra recorded in the B-X region of the dihalogens. In addition to features associated with He2.. 79Br2 and He2....I35Cl complexes with the rare gas atoms localized in the toroidal potential well lying in a plane perpendicular to the dihalogen bond, those associated with a ground-state conformer that has one He atom localized in the toroidal potential and the other He atom localized in the linear well at the end of the dihalogen moiety are also identified. Transitions of at least three conformers of the He 3...Br2 complex and two conformers of the He 3···ICl complex are also observed. The relative populations of the different conformers are found to depend on where along the supersonic expansion the spectra are recorded, and thus on the local temperature regime sampled. The He2....I79Br2 and He 2....I35Cl conformers with one He atom in each well are found to be the more stable conformers.

Original languageEnglish (US)
Pages (from-to)13393-13401
Number of pages9
JournalJournal of Physical Chemistry A
Issue number51
StatePublished - Dec 25 2008


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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