Spin-chemical approach to photochemistry: reaction control by spin quantum operation |
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| Institution: | 1. Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125, USA;2. Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA;1. Departamento de Química, Laboratório de Materiais Inorgânicos, Universidade Federal de Santa María, 97105-900 Santa Maria, RS, Brazil;2. Freie Universität Berlin, Institute of Chemistry and Biochemistry, Fabeckstr. 34-36, D-14195 Berlin, Germany;1. Electrical Engineering Department, Czestochowa University of Technology, Armii Krajowej 17, Czestochowa 42-200, Poland;2. Department of Experimental Physics, Debrecen University, Bem Ter 18a, 4026 Debrecen, Hungary;3. Institute of Physics, J. Dlugosz University, Al. Armii Krajowej 13/15, Czestochowa, Poland;4. Institute of Physics, University of Tartu, Ravila 14C, Tartu 50411, Estonia;5. Institute of Applied Physics, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, Poland;6. College of Sciences, Chongqing University of Posts and Telecommunications, Chongqing 400065, PR China;7. Institute for Nuclear Research, Hungarian Academy of Sciences (MTA Atomki), H-4026 Debrecen, Bem ter 18/c, Hungary |
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| Abstract: | In this review, the contribution of spin chemistry (in particular, magnetic resonance-related chemistry) to the photochemical field is briefly introduced. First, the development of a time-resolved EPR method and its significant application to radical-related physical phenomena and chemical reactions are presented. Second, a reaction-control method by means of electron spin operations is introduced, and several reaction yield-detected magnetic resonance (RYDMR) methods are presented as applications of this concept. One of the most important physical conclusions is the introduction of the concept of “spin phase relaxation” termed singlet–triplet (S–T) and triplet–triplet (T–T) dephasing, instead of the traditional concepts of longitudinal (T1) and transversal relaxations (T2). The effects of strong microwave power on the RYDMR spectrum and time-domain data are analyzed according to this concept. Furthermore, a new detection method is introduced, termed “photoconductivity detected magnetic resonance” (PCDMR), which is applicable exclusively to the system of charge transfer reactions. |
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