Photoelectron spectroscopy of C3Si and C4Si2 anions

The 364 nm photoelectron spectra of the linear C3Si− and C4Si2− anions are reported. Accurate adiabatic electron affinities are determined: EA(3Σ C3Si)=2.827±0.007 eV and EA(C4Si2)=2.543±0.006 eV. Several vibrational frequencies for both neutral molecules are also obtained. The term energy for the f...

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Bibliographic Details
Published in:The Journal of chemical physics 2001-07, Vol.115 (4), p.1789-1794
Main Authors: Davico, Gustavo E., Schwartz, Rebecca L., Lineberger, W. Carl
Format: Article
Language:English
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Summary:The 364 nm photoelectron spectra of the linear C3Si− and C4Si2− anions are reported. Accurate adiabatic electron affinities are determined: EA(3Σ C3Si)=2.827±0.007 eV and EA(C4Si2)=2.543±0.006 eV. Several vibrational frequencies for both neutral molecules are also obtained. The term energy for the first linear excited state of C3Si (either Δ1 or Σ)1 is 0.274±0.015 eV. For C4Si2, the term energy is substantially lower than in C3Si and vibronic interactions between the two states become stronger. Experimental results are compared with high-level ab initio calculations for C3Si (see Rintelman and Gordon, following paper) and with our own calculations for C4Si2 and its anion.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1380713