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首页> 外文学位 >THE COLLISIONAL QUENCHING OF ELECTRONICALLY EXCITED IODINE ATOMS BY MOLECULAR OXYGEN.
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THE COLLISIONAL QUENCHING OF ELECTRONICALLY EXCITED IODINE ATOMS BY MOLECULAR OXYGEN.

机译：分子氧对电子激发的碘原子的集体猝灭

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Molecular energy transfer processes have recently been the subject of intense study, both theoretically and experimentally. This thesis describes work undertaken to elucidate the deactivation processes in the gas phase interaction of electronically excited iodine atoms (I* (TBOND) 5 ('2)P(, 1/2)) with molecular oxygen.; Electronically excited iodine was created by the pulsed laser photolysis of a variety of aryl, alkyl, an perfluoroalkyl iodides. The kinetics of the deactivation processes were observed using the technique of time-resolved infrared fluorescence which monitored the 1.315 micron emission from the I* (('2)P(, 1/2)).; From the time dependence of the fluorescence, the kinetics of the I*-O(,2) system was derived. The primary mechanism of the I*(('2)P(, 1/2)) deactivation is shown to be an electronic-to-electronic energy-transfer equilibrium process between the iodine and the oxygen, creating electronically excited O(,2)* (('1)(DELTA)(,g)). This is in contrast to an earlier report using similar methods. Also observed were results indicative of a process which rapidly quenches the singlet oxygen. This process is dependent upon the precursor used to generate the initial I*(('2)P(, 1/2)). Although attempts were made to identify the quenching species, its identity remains unclear.; Computer modeling of the proposed kinetic scheme was undertaken to study further the mechanism of deactivation. These results verify the validity of the experimental results.
机译：分子能量转移过程最近在理论上和实验上都已成为研究的热点。本论文描述了为阐明电子激发的碘原子（I *（TBOND）5（'2）P（，1/2））与分子氧的气相相互作用中的失活过程而开展的工作。电子激发的碘是通过脉冲激光光解各种芳基，烷基，全氟烷基碘而产生的。使用时间分辨红外荧光技术观察失活过程的动力学，该技术监测了I *（（'2）P（，1/2））的1.315微米发射。从荧光的时间依赖性，推导了I * -O（，2）系统的动力学。 I *（（'2）P（，1/2））失活的主要机理被证明是碘和氧之间的电子到电子能量转移平衡过程，产生了电子激发的O（，2 ）*（（''1）（DELTA）（，g））。这与之前使用类似方法的报告形成了对比。还观察到指示快速淬灭单线态氧的过程的结果。此过程取决于用于生成初始I *（（'2）P（，1/2））的前体。尽管已尝试鉴定淬灭物质，但其身份仍不清楚。对提出的动力学方案进行了计算机建模，以进一步研究失活机理。这些结果验证了实验结果的有效性。

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