报导了利用纳秒级激光光解瞬态吸收光谱技术研究环苯丙氨酰组氨酰水溶液光解和光敏化作用过程.发现了该环肽在248nm激光的激励下产生光电离和光解离,光电离和光解离过程发生在苯丙氨酸残基上,生成具有320nm和410nm特征吸收的自由基,光解离产生具有320nm特征吸收的苄基自由基.而具有亲电子性的丙酮能在该环肽的苯丙氨酸残基的苯环上抽取电子,形成320nm和410nm的特征吸收峰,求出了自由基的有关动力学参数,并用脉冲辐解动态吸收光谱法印证了上述结果. Reported the use of nanosecond-level laser photolysis transient absorption spectroscopy ring of phenylalanyl histidyl aqueous solution of photolysis and photosensitization process was found that the ring peptide 248nm laser excitation photopotentiation and photodissociation, Photoionization and photodissociation took place on the phenylalanine residues to generate free radicals with characteristic absorptions of 320 nm and 410 nm, and photolysis gave benzyl radicals with a characteristic absorption of 320 nm. The electrophilic acetone was able to react with The benzene ring of phenylalanine residue of the cyclic peptide was extracted to form characteristic absorption peaks at 320nm and 410nm. The kinetic parameters of free radicals were calculated. The results were confirmed by pulse radiolysis dynamic absorption spectroscopy.