Clusters containing open-shell molecules

Minimum-energy structures and low-lying isomers of ArnCH (X 2∏), n = 1 to 15

M. Xu, Zlatko Bacic, J. M. Hutson, Clary, Leung, Marshall, Smith, Lester, Neumark, Nesbitt, Gerber, Botschwina, Mestdagh, Dagdigian, Wheeler, Garrett, Bačić, Hutson, Harvey, Naumkin

Research output: Contribution to journalArticle

Abstract

The size evolution of the equilibrium structures of open-shell ArnCH (X 2∏) Van der Waals clusters is investigated for n = 1 to 15. We describe a method for combining pair potentials for Ar-CH and Ar-Ar interactions to obtain potential energy surfaces for ArnCH clusters. For each cluster size considered, the global and a few energetically close local minima are calculated using simulated annealing followed by a direct minimization scheme. Ar2CH is found to have an unusually stable planar structure, which persists as a motif in larger ArnCH clusters and has a strong effect on their optimal geometries. The lowest-energy isomers of ArnCH with n = 3 to 11 have all Ar atoms in a shell around CH. The only exception is Ar4CH, where the fully solvated isomer is 3 cm-1 higher in energy than the optimal isomer with CH bound to the surface of the Ar4 tetrahedron. For n = 7 to 11, the minimum-energy structure of ArnCH derives from the global minimum of the Arn+1 cluster, by replacing the Ar atom at the bottom of the pentagonal bipyramid with CH. The lowest-energy structure of Ar12CH is that of the optimal icosahedral Ar13 cluster, with CH replacing one of the Ar atoms on the cluster surface. This structure supports the proposition based on the spectroscopic data, that for ArnCH clusters with about 10 to 50 Ar atoms CH resides on the surface of Arn.

Original languageEnglish (US)
Pages (from-to)405-417
Number of pages13
JournalFaraday Discussions
Volume118
StatePublished - 2001

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Shells (structures)
open clusters
Isomers
isomers
Atoms
Molecules
methylidyne
molecules
Potential energy surfaces
energy
Simulated annealing
atoms
Geometry
planar structures
simulated annealing
tetrahedrons
potential energy
optimization

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Clusters containing open-shell molecules : Minimum-energy structures and low-lying isomers of ArnCH (X 2∏), n = 1 to 15. / Xu, M.; Bacic, Zlatko; Hutson, J. M.; Clary; Leung; Marshall; Smith; Lester; Neumark; Nesbitt; Gerber; Botschwina; Mestdagh; Dagdigian; Wheeler; Garrett; Bačić; Hutson; Harvey; Naumkin.

In: Faraday Discussions, Vol. 118, 2001, p. 405-417.

Research output: Contribution to journalArticle

Xu, M, Bacic, Z, Hutson, JM, Clary, Leung, Marshall, Smith, Lester, Neumark, Nesbitt, Gerber, Botschwina, Mestdagh, Dagdigian, Wheeler, Garrett, Bačić, Hutson, Harvey & Naumkin 2001, 'Clusters containing open-shell molecules: Minimum-energy structures and low-lying isomers of ArnCH (X 2∏), n = 1 to 15', Faraday Discussions, vol. 118, pp. 405-417.
Xu, M. ; Bacic, Zlatko ; Hutson, J. M. ; Clary ; Leung ; Marshall ; Smith ; Lester ; Neumark ; Nesbitt ; Gerber ; Botschwina ; Mestdagh ; Dagdigian ; Wheeler ; Garrett ; Bačić ; Hutson ; Harvey ; Naumkin. / Clusters containing open-shell molecules : Minimum-energy structures and low-lying isomers of ArnCH (X 2∏), n = 1 to 15. In: Faraday Discussions. 2001 ; Vol. 118. pp. 405-417.
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abstract = "The size evolution of the equilibrium structures of open-shell ArnCH (X 2∏) Van der Waals clusters is investigated for n = 1 to 15. We describe a method for combining pair potentials for Ar-CH and Ar-Ar interactions to obtain potential energy surfaces for ArnCH clusters. For each cluster size considered, the global and a few energetically close local minima are calculated using simulated annealing followed by a direct minimization scheme. Ar2CH is found to have an unusually stable planar structure, which persists as a motif in larger ArnCH clusters and has a strong effect on their optimal geometries. The lowest-energy isomers of ArnCH with n = 3 to 11 have all Ar atoms in a shell around CH. The only exception is Ar4CH, where the fully solvated isomer is 3 cm-1 higher in energy than the optimal isomer with CH bound to the surface of the Ar4 tetrahedron. For n = 7 to 11, the minimum-energy structure of ArnCH derives from the global minimum of the Arn+1 cluster, by replacing the Ar atom at the bottom of the pentagonal bipyramid with CH. The lowest-energy structure of Ar12CH is that of the optimal icosahedral Ar13 cluster, with CH replacing one of the Ar atoms on the cluster surface. This structure supports the proposition based on the spectroscopic data, that for ArnCH clusters with about 10 to 50 Ar atoms CH resides on the surface of Arn.",
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