New development of the researches in the magnetic field effects on chemical reactions

我们试图发现磁场对化学反应的新影响，将我们的研究扩展到该领域尚未开发的地区。我们成功地发现了以下新效应：我们研制了一种适合于室温下化学反应测量的脉冲磁体。在17-30T的超高磁场下，利用该磁体和我们的激光光解装置，我们首次发现了胶束和有机溶液中一些光化学反应对自由基寿命和逃逸自由基产率的新影响。我们已经根据弛豫机制解释了在0-30 T场下胶束溶液中观察到的效应。由于在0-30 T的磁场下，磁场对流体有机溶液产率的影响无法用传统的理论来解释，我们提出了一种结合Ag和弛豫机制的新理论。利用这一新理论，我们可以对影响进行定量分析。我们首先研制了一种适合于测量磁场对普通有机分子光化学反应影响的ps激光光解装置。利用这个装置和我们的电磁铁，我们发现了在流体溶液中产生的自由基对的三重-单重转化的影响。我们用Ag的机制来解释这种效应。利用我们的ns激光光解装置，我们发现了磁场对流体溶液中一些光化学反应中逸出自由基产率的新影响，这种影响是通过四重奏态和六重奏态进行的，其中六重奏态是迄今为止研究过的对最高自旋态的影响。我们用涉及四重奏-重态和六重奏-四重奏转换的弛豫机制来解释这些效应。

We have tried to find new magnetic field effects on chemical reactions, extending our studies to unexplored regions of this field. We have succeeded in finding the foliowing new effects :1.We developed a pulscd magnet, which was suitable for the measurements of chemical reactions at room temperature. Using this magnet and our ns-laser photolysis apparatus, we have frst found many new effects on radical pair lifetimes and escape radical yields for some photochemical reactions in micellar and organic solutions under ultra-high magnetic fields of 17-30T. We have interpreted the effects observed in micellar solutions under fields of 0-30 T in terms of the relaxation mechanism.2.Because the magnetic field effccts on the yields in fluid organic solutions under fields of 0-30 T could not be explained by the conventional theory, we have dcveloped a new theory with a combination of the Ag and relaxation mechanisms. Using this new theory, we could make a quantitative analysis of the effects.3.We frrst developed a ps-laser photolysis apparatus, which was suitable for the measurement of magnetic field effects on photochemical reactions of usual organic molecules. Using this apparatus and our electromagnet, we have found the effect on the triplet-singlct conversion of a radical pair generated in a fluid solution. We have interpreted this effect in terms of the Ag mechanism.4.Using our ns-laser photolysis apparatus, we have found new magnetic field effects on escaped radical yields in some photochemical reactions in fluid solutions through quartet and sextet states, The latter one is the effect for the highest spin state which has ever been studied so for. We have interpreted these effects in terms of the relaxation mechanism involving the quartet-doublet and sextet-quartet conversions.