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化学诱导动态电子极化(ChemicaUy Induced Dynamical Electron Polarization)即CIDEP是顺磁粒子在其自旋态间由于非热平衡分布而引起的一种现象。产生CIDEP现象可概括为两种情形,相应有两种理论对此给于解释。其一为三重态机理(TM);其二为自由基对机理(RPM)。然而1986年Imamura等发现激光照射氧化4-氨基-2,2,6,6-四甲基吡啶(ATEMPO)及(Ph)_2CO的苯溶液产生ATEMPO的发射信号(CIDEP),他们认为这是~(Ph)_2CO的电子自旋极化转移到ATEMPO分子上所致,这种电子自旋极化转移机理(ESPT)类似TM现理,即由三重态分子的自旋角动量守恒所造成的。ESPT理论似乎能解释一些光敏分子与稳定自由基体系的极化现象,但不能解释所有的实验现象,借用类似于RPM机理处理T-[R](三重态-自由基)体系中[R]-T之间相互作用以给出CIDEP现象似乎顺理成章。
Chemically Induced Dynamical Electron Polarization (CIDEP) is a phenomenon caused by non-thermal equilibrium distribution of paramagnetic particles in their spin states. CIDEP phenomenon can be summarized into two cases, the corresponding two theories to explain this. One is the triplet mechanism (TM); the other is the free-radical mechanism (RPM). However, in 1986 Imamura et al. Found that laser irradiation of the benzene solution of 4-amino-2,2,6,6-tetramethylpyridine (ATEMPO) and (Ph) _2CO produced the ATEMPO emission signal (CIDEP) (Ph) _2CO electron spin polarization transfer to the ATEMPO molecule due to the electron spin polarization transfer mechanism (ESPT) similar to the TM principle, that is, by the triplet state of the spin angular momentum conservation caused. The ESPT theory seems to explain the polarization phenomena of some photoactive molecules and stable free radical systems, but it can not explain all the experimental phenomena. By using the mechanism similar to RPM to deal with the [R] - T interaction between the CIDEP phenomenon seems to be a matter of course.