Disentangling mode-specific reaction dynamics from overlapped images.
The hydrogen abstraction reaction between atomic chlorine and C-H stretch-excited CHD(3) was studied under crossed-beam conditions. Prior to collisions, an infrared (IR) laser was used to pump up a fraction of CHD(3) to nu(1) = 1. A time-sliced velocity imaging technique was exploited to image the recoil velocity distribution of the state-selected product CD(3)(nu = 0). For energetic reasons, the IR-on image shows severely overlapped features arising from both the excited and the un-pumped ground-state reagents. A novel threshold method was then developed to directly determine the fraction of IR-excited CHD(3) reagents, which in turn enables us to disentangle the state-selected dynamics from the overlapped images. The results reveal significant differences from previous experimental reports.
Yan
Shannon Shiuan
SS
Institute of Atomic and Molecular Sciences, Academia Sinica, PO Box 23-166, Taipei, 10617, Taiwan.
Wu
Yen-Tien
YT
Liu
Kopin
K