Characterization of silicon-carbon clusters by infrared laser spectroscopy: The Z+(Q) band of linear S&C3
نویسنده
چکیده
The +(a,) fundamental vibration of ‘2; S&C3 has been observed using a laser vaporization-supersonic cluster beam-diode laser spectrometer. Forty rovibrational transitions were measured in the range of 1965.8 to 1970.9 cm-’ with a rotational temperature of lo-15 K. A least-squares fit of these transitions yielded the following molecular constants: ~~((+,~)=1968.188 31(18) cm -‘, B”=0.031 575 l(60) cm-‘, and B’ =0.031 437 4(57) cm-‘. These results are in excellent agreement with recent Fourier transform infrared (FTIR) measurements of Si,C, trapped in a solid Ar matrix [J. Chem. Phys. 100, 181 (1994)] and with ab initio calculations [J. Chem. Phys. 100, 175 (1994)] which suggest cumulenic-like bonding for Si&, analogous to the isovalent Cs carbon cluster.
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