Absolute I* quantum yields for the ICN Ã state by diode laser gain-vs-absorption spectroscopy

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Abstract
Absolute I* quantum yields have been measured as a function of wavelength for room temperature photodissociation of the ICN Ã state continuum. The yields are obtained by the technique of time‐resolved diode laser gain‐vs‐absorption spectroscopy. Quantum yields are evaluated at seven wavelengths from 248 to 284 nm. The yield at 266 nm is 66.0±2% and it falls off to 53.4±2% and 44.0±4% at 284 and 248 nm, respectively. The latter values are significantly higher than those obtained by previous workers using infrared fluorescence. Estimates of I* quantum yields obtained from analysis of CN photofragment rotational distributions, as discussed by other workers, are in good agreement with the I* yields reported here. The results are considered in conjunction with recent theoretical and experimental work on the CN rotational distributions and with previous I* quantum yield results.