PHYS 616 |
| Electronic spectra of the SiB and AlC molecules have been recorded using a corona excited supersonic emission source. Precursor gases, diborane and silane or trimethyl aluminum, are seeded in helium and expanded through a pinhole nozzle. An electric discharge through the throat of the expansion generates electronically excited but rotationally cold (8-50K) molecules by atomic recombination. Rotationally resolved electronic spectra consisting of many vibrational bands are recorded with a 1.3m spectrometer and CCD camera. With favorable Franck-Condon factors we can characterize many vibrational levels of the ground state (v=0-11 for SiB and v=0-8 for AlC). Potential energy curves for the 4Σ- ground states are constructed by the RKR method. For some excited electronic states emission is observed from several vibrational levels allowing construction of their potential energy curves. The vibrational dependence of the spin-orbit splitting for 4Π states provides an insight into their electronic configurations. |
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PHYS Poster Session - Computational Spectroscopy and Reaction Dynamics
7:30 PM-10:00 PM, Wednesday, April 9, 2008 Morial Convention Center -- Hall A, Poster
Division of Physical Chemistry |