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Ultrafast x-ray Diffraction and Structural Dynamics of Photodissociation of C2F4I2 in Solution

등록일
2005년 8월 22일 21시 44분 35초
접수번호
1020
발표코드
22P130포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
토 <발표Ⅳ>
발표형식
포스터
발표분야
물리화학
저자 및
공동저자
이재혁, 김태규, 김중한, 이효철
한국과학기술원 화학과,
We report direct structural determination of photodissociation of 1,2-diiodotetrafluoroethane (C2F4I2) in polar solution, obtained using time-resolved liquid-phase x-ray diffraction. Ultrashort laser pulses were used to initiate the cleavage of an iodine atom from C2F4I2 dissolved in methanol, and x-ray pulses from a third generation synchrotron probed the structural dynamics with ~100 picosecond time-resolution. The bond-rupture of C2F4I2 leads to the formation of transient CF2ICF2· radical and I atom as well as complete dissociation to the C2F4 and 2I. Then I atom binds another I atom and eventually makes I2 in cage via non-geminate recombination. Solvent dynamics, which are explained by heating and thermal expansion, were also extracted from time-resolved x-ray diffraction data.

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