PICOSECOND FLUORESCENCES FROM PHOTOREACTIVE EXCITED STATES
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Date
1977
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Ohio State University
Abstract
The high instantaneous pumping powers available in mode-locked 531 nm SHG and 354 nm THG pulses from $Nd^{3+}$:glass lasers permit the study of fluorescences From excited states in photoreactive molecules which are so short-lived that they have escaped prior detection. We have characterized the spectra and fluorescence lifetimes in organic photoreagents (e.g., transazobenzene), small molecules (e.g., $I_{2}$ in $CCl_{4}$), and coordination compounds such as $ Mn_{2} (CO)_{10}$. Interesting trends are observed in the transition from resonance Raman emission (RRE) to fluorescence when picosecond excitation pulses are used. In favorable cases (e.g., in $B \rightarrow X$ fluorescence of $I_{2}$ in $CCI_{4} $), the emission spectrum can be used to infer the nature of competition between vibrational relaxation and photoreaction in the emitting state.
Description
Author Institution: Department of Chemistry, Ames Laboratory-ERDA, Iowa State University