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Ergodic vs. non-ergodic pathways during laser-induced dissociation of protonated tryptophan-leucine dipeptide

등록일
2008년 2월 12일 10시 03분 15초
접수번호
0738
발표코드
금29A9구 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 17시 : 05분
발표형식
구두발표
발표분야
물리화학
저자 및
공동저자
강혁, Gilles Grégoire1, Christophe Jouvet2
아주대학교 자연과학부,
1Laboratoire de Physique des Lasers du CNRS, France,
2Laboratoire de Photophysique Moléculaire du CNRS, France,
Laser-induced dissociation of protonated tryptophan-leucine was studied using a femtosecond laser and a time-of-flight mass spectrometer. The protonated dipeptide ion, generated by ESI, was irradiated with 266 nm femtosecond laser and subsequent dynamics was probed with 800 nm femtosecond laser. Two competing primary deactivation processes were found by mass-selective detection of the fragments, revealing both ergodic and non-ergodic dissociation pathways. Similar to the protonated tryptophan, the initially excited ππ* state decays with two ultrafast time constants; 1 and 10 picoseconds. The faster dynamics corresponds to the dissociation on a repulsive πσ* excited state, hence the non-ergodic dissociation. The deactivation pathway bifurcates at the intersection of the πσ* state and the ground state, leading to the slower channel of ergodic dissociation after internal conversion.

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