Wernet Ph, Odelius M, Godehusen K, Gaudin J, Schwarzkopf O, Eberhardt W
Helmholtz-Zentrum Berlin, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany.
Phys Rev Lett. 2009 Jul 3;103(1):013001. doi: 10.1103/PhysRevLett.103.013001. Epub 2009 Jun 29.
Time-resolved valence band photoelectron spectroscopy with a temporal resolution of 135 fs is used to map the entire occupied valence electronic structure of photoexcited gas-phase Br2 molecules during dissociation. The observed shifting and mixing of valence energy levels defines a transition period where the system appears to be intermediate between atoms and molecules. The surprisingly short bond breaking or dissociation time is determined by monitoring in real time how the photoelectron multiplet structure of the free atom arises from the valence states of the photoexcited molecule.
时间分辨价带光电子能谱具有135飞秒的时间分辨率，用于绘制光激发气相Br2分子在解离过程中整个被占据的价电子结构。观察到的价能级的移动和混合定义了一个过渡时期，在此期间系统似乎处于原子和分子之间的中间状态。通过实时监测自由原子的光电子多重态结构如何从光激发分子的价态产生，确定了惊人的短键断裂或解离时间。
