The SiP molecule : the first observation and spectroscopic characterization

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Journal titleThe Journal of Chemical Physics
Pages65136520; # of pages: 8
Subjectfluorescence; matrix algebra; silicon compounds; spin-orbit interactions
AbstractSiP molecules have been produced in a molecular free jet apparatus by laser vaporizing a silicon rod in the presence of He doped with phosphine (PH3) gas. Excitation spectra have been observed in the 21200-22350 cm-1 range by monitoring laser induced fluorescence. Dispersed fluorescence spectra have been recorded out of the upper states of the excitation bands. The ground electronic state is X 2Pii with the spin-orbit splitting A=-186.774(11) cm-1, the harmonic wavenumber omegae=615.7(6) cm-1, and the equilibrium internuclear distance re=2.0775(17) ?. Two excited electronic states, A 2Sigma+ and B 2Sigma+, are observed at T0=427.4(5) and 21317.1(1) cm-1, respectively. The harmonic wavenumbers, omegae, and the equilibrium internuclear distances, re, are 680(2) cm-1 and 1.9658(13) ?, respectively, for the A 2Sigma+ state and 455(1) cm-1 and 2.1278(8) ?, respectively, for the B 2Sigma+ state. For the X 2Pii, A 2Sigma+, and B 2Sigma+ electronic states, RKR potentials have been generated. Franck-Condon factors for the B-X, B-A, and A-X systems have been calculated. A 2Sigma+, v~X 2Pi1/2, v+1 perturbations have been observed. A deperturbation procedure has yielded the off-diagonal spin-orbit electronic matrix element equal to 51(8) cm-1. This work represents the first spectroscopic investigation of the SiP molecule.
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AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
NPARC number12338267
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Record identifierd8c023f9-ab6e-4267-82f0-e801d528cc8b
Record created2009-09-10
Record modified2017-03-23
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