Vibrational spectra of small silicon monoxide cluster cations measured by infrared multiple photon dissociation spectroscopy.
The first gas-phase infrared spectra of silicon monoxide cations (SiO)(n)(+), n = 3-5, using multiple photon dissociation in the 550-1250 cm(-1) frequency range, are reported. All clusters studied here fragment via loss of a neutral SiO unit. The experimental spectra are compared to simulated linear absorption spectra from calculated low energy isomers for each cluster. This analysis indicates that a "ring" isomer is the primary contributor to the (SiO)(3)(+) spectrum, that the (SiO)(4)(+) spectrum results from two close-lying bicyclic ring isomers, and that the (SiO)(5)(+) spectrum is from a bicyclic ring with a central, fourfold-coordinated Si atom. Experiment and theory indicate that the energies and energetic orderings of (SiO)(n)(+) isomers differ from those for neutral (SiO)(n) clusters.
Garand
Etienne
E
Department of Chemistry, University of California, Berkeley, California 94720, USA. dneumark@berkeley.edu
Goebbert
Daniel
D
Santambrogio
Gabriele
G
Janssens
Ewald
E
Lievens
Peter
P
Meijer
Gerard
G
Neumark
Daniel M
DM
Asmis
Knut R
KR
D000327:Adsorption; D000465:Algorithms; D002412:Cations / Q000737:chemistry; D007536:Isomerism; D053758:Nanoparticles / Q000032:analysis / Q000737:chemistry*; D010087:Oxides / Q000032:analysis / Q000737:chemistry*; D017785:Photons; D012825:Silicon / Q000737:chemistry*; D017655:Silicon Compounds / Q000032:analysis / Q000737:chemistry*; D013055:Spectrophotometry, Infrared / Q000379:methods
D002412:Cations; D010087:Oxides; D017655:Silicon Compounds; C116473:silicon monoxide; D012825:Silicon