Department of Physics, Stanford University, Stanford, California 94305, USA.
Phys Rev Lett. 2012 Jun 22;108(25):253006. doi: 10.1103/PhysRevLett.108.253006. Epub 2012 Jun 21.
We report the first study of UV-induced photoisomerization probed via core ionization by an x-ray laser. We investigated x-ray ionization and fragmentation of the cyclohexadiene-hexatriene system at 850 eV during the ring opening. We find that the ion-fragmentation patterns evolve over a picosecond, reflecting a change in the state of excitation and the molecular geometry: the average kinetic energy per ion fragment and H(+)-ion count increase as the ring opens and the molecule elongates. We discuss new opportunities for molecular photophysics created by optical pump x-ray probe experiments.
我们报告了首例通过 X 射线激光探测核心离化的紫外光诱导光致异构化研究。我们在环打开过程中研究了 850eV 时环己二烯-己三烯体系的 X 射线离化和碎裂。我们发现，离子碎片的分布在皮秒级内演化，反映了激发态和分子几何形状的变化：随着环的打开和分子的伸长，每个离子碎片的平均动能和 H(+)离子计数增加。我们讨论了光泵 X 射线探针实验带来的分子光物理新机遇。
