CAJ | 학술논문

利用飞秒时间分辨的光电子影像技术结合时间分辨的质谱技术,研究了3-甲基吡啶分子激发态的超快过程.实时观察到了3-甲基吡啶分子S2态向S1态高振动能级的超快内转换过程,该内转换的时间大约为910 fs.二次布居的S1态主要通过内转换衰减到基态S0,该内转换的时间尺度为2.77 ps.光电子能谱分布和光电子角分布显示, S2态和S1态在电离的过程中跟3p里德堡态发生偶然共振.本次实验中还用400 nm两个光子吸收的方法布居了3-甲基吡啶的3s里德堡态.研究表明,3s里德堡态的寿命为62 fs,并主要通过内转换快速衰减到基态.
이용비초시간분변적광전자영상기술결합시간분변적질보기술,연구료3-갑기필정분자격발태적초쾌과정.실시관찰도료3-갑기필정분자S2태향S1태고진동능급적초쾌내전환과정,해내전환적시간대약위910 fs.이차포거적S1태주요통과내전환쇠감도기태S0,해내전환적시간척도위2.77 ps.광전자능보분포화광전자각분포현시, S2태화S1태재전리적과정중근3p리덕보태발생우연공진.본차실험중환용400 nm량개광자흡수적방법포거료3-갑기필정적3s리덕보태.연구표명,3s리덕보태적수명위62 fs,병주요통과내전환쾌속쇠감도기태.
The ultrafast dynamics of excited states in 3-picoline was studied using femtosecond time-resolved photoelectron imaging, coupled with time-resolved mass spectroscopy. An ultrafast internal conversion from the S2 state to the vibrationally excited S1 state in about 910 fs was observed. This secondary-populated S1 state further deactivates to the S0 state in 2.77 ps. The photoelectron energy and angular distributions show ionizations from the singlet 3p Rydberg states. Two 400 nm photon excitations to the 3s Rydberg state suggest that this state probably decays to the ground state in 62 fs.