Combining a nanosecond ruby laser with an image sensor detector system and a microcomputer, a convenient laser photolysis system has been constructed and a transient absorption spectrum in a 400-nm scanning region (at a delay time from 2 μs to 1 ms) can be recorded by one or two laser shots at a given temperature ranging from 88 K up to room temperature. The spectral resolution is 2.4 nm, while the temporal resolution may be on the tenth of microseconds due to a limited pulse width of the probing light (FWHM=1.7 μs). This laser photolysis system is convenient for discrimination of small differences in absorption spectra of short-lived species. Also, the system gives a correct absorption spectrum in the spectral region where strong emissions due to the transient species are observable.
