DISPERSED FLUORESCENCE SPECTROSCOPY OF H$_2$CO IN A FREE-JET EXPANSION
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Publisher:Ohio State University
High resolution dispersed fluorescence (DF) spectra of the excited vibrational levels in formaldehyde have been recorded to describe its S$_0$ potential energy surface. Formaldehyde was cooled in a free-jet expansion and excited with a laser to the 4$^1$, 4$^0$, 3$^1$4$^1$ and 5$^1$ levels in S$_1$. The resulting fluorescence was dispersed with a monochromator to yield S$_0$ vibrational spectra. Over 268 vibrational transitions have been assigned and fit to a polyad model. The model includes harmonic and anharmonic terms, and also accounts for resonances among vibrational levels. The results are compared to ab initio calculations.
Author Institution: Department of Chemistry, Hope College, Holland, MI 49423