Physics
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..confewi05z&link_type=abstract
"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec
Physics
Mini-Symposium: Spectroscopic Perturbations
Scientific paper
We report the first recording of the visible spectrum of gas-phase Si_3. A cold molecular beam sample was produced by skimming the output of a pulsed discharge source. The 545-490 nm spectral region was examined using both mass-selected REMPI and pulsed dye laser excitation with LIF detection. Dispersed fluorescence and lifetime measurements of numerous bands were recorded. The spectrum has an origin at 18600 Cm-1 and a progression in the symmetric stretch with a harmonic frequency of 445 Cm-1. The bands are assigned to the 13A_1''- tilde{a}A_2' transition of the D3h isomer based upon new and previous predictions. A vibrational progression observed in the dispersed fluorescence having a spacing of 505 Cm-1 is in agreement with previous ZEKE studies. An additional vibrational progression observed in dispersed fluorescence having a spacing of 173 Cm-1 is in agreement with the bending frequency for the tilde{X}1A_1 state of the C2v isomer estimated from the pure rotational spectrum.
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Crawford T. D.
Fortenberry B.
Kokkin D.
Maier John P.
McCarthy Mary C.
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