Photodissociation dynamics of polyatomic molecules using degenerate four-wave mixing spectroscopy축퇴사광파혼합분광학을 이용한 다원자분자의 광분해 연구

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Two-photon degenerate four-wave mixing spectroscopy has been newly applied to detect photofragments formed by photodissociation. The photodissociation of methyl iodide has been studied at 266 nm by monitoring the atomic iodines nascent via two-photon degenerate four-wave mixing spectroscopy. The ground state $I(^2P_{3/2})$ was detected via the $5p^2P_{3/2}$ → $6p^2D_{5/2}$ two photon transition (304.67 nm), and the spin-orbit excited state $I^*(^2P_{1/2})$ via the $5p ^2P_{1/2}$ → $6p ^2D_{1/2}$ transition (304.02 nm). The signal line profiles were well characterized with Gaussian shaped functions. A cubic dependence of the signal intensity on the input laser was observed. The line center saturation intensities have been determined to be 3863 MW/㎠ for I and 1969 MW/㎠ for $I^*$. The signal ratios between I and $I^*$ has varied with the input laser intensity. In this study we have found that the $I^*$/I branching ratio has been extracted based on the various signal intensities. Two-photon degenerate four-wave mixing scheme is very useful for the measurement of the internal state distributions of the photofragments, which are formed in photodissociation.
Advisors
Jung, Kyung-Hoon정경훈
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2001
Identifier
165742/325007 / 000993360
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학과, 2001.2, [ vi, 38 p ]

Keywords

methyl iodide; Degenerate Four-Wave Mixing; photodissociation; 광분해 동역학; 축퇴사광파혼합분광학; spectroscopy

URI
http://hdl.handle.net/10203/31880
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=165742&flag=dissertation
Appears in Collection
CH-Theses_Master(석사논문)
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