Dynamics of the tyrosine triplet state from magnetic resonance-saturated phosphorescence decay measurements

✍ Scribed by Tiao-te Co; Robert J. Hoover; August H. Maki

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 421 KB
• Volume: 27
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(74)80432-x

✦ Synopsis

Analysis of the phosphorescence decays measured during magnetic resonance saturation of sublevel popularions has been Qrried out on tyrosine and tyrosinate triplet states at 1.17"K in zero field. The individual sublevel decay constants and spin-lattice relaxation rate conslants are derived. Relative intersystem crossing rates to the sublevels are obtained from flash excitz.tion microwave-induced delayed phosphorescence measurements. Intersystem crossing is nor spin-selective in ryrosine. bur becomes so upon icnizntion near pH = 12. ?hr spin-selective intersystem crossing mechanism in tyrosinnte is discussed in terms of a model proposed by Bersohn.