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Creators: Lee, Y. S.; Silvers, S. J.
Issue Date: 1984
Publisher: Ohio State University
Abstract: The emission spectrum of gas phase $CS_{2}$, excited by a nitrogen laser, consists of discrete bands superimposed upon an apparent continuum. The discrete structure is known to be resonance fluorescence arising from the $T ^{1}A_{2}$ state. The continuum is not as well understood. This work investigates the origin and nature of the continuum - like emission. The ratio of continuum to discrete intensities has been measured at different $CS_{2}$ pressures. A significant amount of the continuum emission is pressure or collision dependent, but the ratio does not extrapolate to zero in the low pressure limit (below 1 mtorr). Part of the emission persists in the absence of collisions. The continuum extends from below 400 nm to the red detection limit. Lifetimes are observed to depend on the detection wavelength, varying from $4 \mu$sec at 435 nm to $8 \mu$sec at 484 nm. It appears that a range of levels, populated from initially excited states by inter and intramolecular relaxation processes, give rise to the continuum - like emission. The levels responsible for the red emission region have longer lifetimes than those responsible for the blue region.
Description: Author Institution: Department of Chemistry, Virginia Commonwealth University
URI: http://hdl.handle.net/1811/16736
Other Identifiers: 1984-RF-8
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