Atomic Iodine Ionization Mechanics by Photoelectron Imaging
Date Issued
2007
Date
2007
Author(s)
Chen, Yi-Lih
DOI
zh-TW
Abstract
This thesis is about the ionization of atomic iodine following A-band photolysis of CH3I by the photoelectron imaging. In the experiment, the laser is operated in the range of 245.5 - 261.6 nm.
Final state-specific speed and angular distributions of the photoelectron were recorded. Two types of the photoelectron resulted from ionizing the I atom from the photodissociation of CH3I were identified: (a) (2+1) REMPI of the ground state I atom, and (b) two-photon excitation of spin-orbit excited I to autoionizing resonances converging to the 3P1 state of I+. Analysis of relative branching ratios to different levels of I+ (in case (a)) revealed that the final ion level distributions are generally dominated by the preservation of the ion-core configuration of the intermediate resonant Rydberg state. A qualitative interpretation of the electron angular distribution from an autoionization process is also given.
Subjects
光電子影像
動力學
(2+1) 雙光子共振游離
雷德堡能態
超激發態
自動游離機制
photoelectron imaging
Photoionization dynamics
(2+1) REMPI
Rydberg state
superexcitede state
autoionization
Type
thesis
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