ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 34, Number 3
JKCSEZ 34(3)
June 20, 1990 

The nitrogen-laser flash photolysis apparatus has been set up to detect directly the transient produced from the excited Benoxaprofen (BXP). The function of the instrument has been tested by using anthracene as a standard sample. The laser photoexcitation of BXP in ethanol has been carried out under a constant stream of N2 gas and a transient absorption spectrurn has been recorded over the 400-600 nm. The effects of oxygen and β-carotene on the transient spectrum reveal that thee maximum transient absorption at 415 nm is attributed to the triplet state of BXP and the triplet energy of BXP is above 22 Kcal/mole. In addition to the triplet state, another transient species has been observed to be produced, which is probably a radical form of BXP. The photosensitization mechanism of BXP is discussed based on these results.