Abstract
In the present study on the photodissociation of alkyl iodides, we utilize a recently developed technique1 of laser gain-vs-absorption spectroscopy to obtain accurate quantum yields. The laser gain-vs-absorption approach, which is a two-laser pulse-and-probe technique, obtains quantum yields from a single time-resolved transient. The initial population inversion following photolysis and the total absorption after complete quenching of the excited state species are measured on a short (~10-μs) time scale. Due to the nature of the internal normalization of the measurement, most experimental parameters cancel, and very accurate results can be obtained. In this work, gain-vs-absorption measurements are per formed with a room temperature InGaAsP diode probe laser. Quantum yields determined at 266 nm for n-C3F7I, i-C3F7I, and CH3I are 102 ± 4%, 102 ± 7%, and 73 ± 4%, respectively. The results are in good agreement with the majority of earlier works, except for recent photoacoustic measurements which gave much lower values.2
© 1986 Optical Society of America
PDF ArticleMore Like This
Steven L. Baughcum and Richard C. Oldenborg
WB3 OSA Annual Meeting (FIO) 1986
A. Welford Castleman, C. R. Albertoni, K. Marti, D. E. Hunton, and R. G. Keesee
JFC7 International Laser Science Conference (ILS) 1986
A. W. Castleman, C. R. Albertoni, K. Marti, D. E. Hunton, and R. G. Keesee
FC7 OSA Annual Meeting (FIO) 1986