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Investigation on the Radical Pair Mechanism of Chemically Induced Dynamic Electron Polarization of Photolyzed Radical

Author: HongXin
Tutor: CuiZhiFeng
School: Anhui Normal University
Course: Atomic and Molecular Physics
Keywords: chemically induced dynamic electron polarization (CIDEP) radical pair mechanism (RPM) time-resolved electron spin resonance (TR-ESR)
CLC: O561.3
Type: Master's thesis
Year: 2006
Downloads: 41
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Abstract


Based on a brief introduction of the important Radical Pair Mechanism （RPM） of Chemically Induced Dynamic Electron Polarization （CIDEP）, a series of CIDEP spectra originated from RPM, partially or entirely, were recorded and analyzed in this dissertation. Furthermore, the CIDEP intensity of RPM was also calculated in detail.As far as the generation of CIDEP is concerned, S - T0 RPM plays a single role or it works with other mechanisms simultaneously such as Triplet Mechanism（TM） and ST-1 . The experimental investigations and theoretical analysis are shown as following.1. S - T0 RPM systems: CIDEP of photolysis of Acetone/EG（PG） and BP/2-propanol systems exhibit classical E/A pattern of S - T0RPM, in which the polarization intensity of the hyperfine lines in low magnetic field side are the same as that in high magnetic field side. Through making a comparison between the simulated spectra and the experimental ones, the mechanisms to generate CIDEP are analyzed in more detail.2. RPM/TM system: the CIDEP spectra of PBQ/EG system exhibits E+E/A pattern with unsymmetrical intensity for the hyperfine lines in low and high magnetic field side. TM is the main polarization in PBQ/EG system. The polarization pattern of BP/EG and BP/PG systems is the same as PBQ/EG system. For BP/EG and BP/PG systems, the high viscous makes the diffusion process of the radical pair to be restricted and the formation of RPM mechanism is limited. So, in addition to RPM, TM polarization also has some contribution for the CIDEP of these two systems.3. ST-1-RPM / S - T0 system: in Acetone/PG/TX-100 system, The CIDEP spectra exhibits E+E/A or A+A/E characteristics with unsymmetrical hyper-fine line

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CLC: > Mathematical sciences and chemical > Physics > Molecular physics, atomic physics > Molecular Physics > Molecular spectroscopy
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