Tunable VUV photochemistry using Rydberg H-atom time-of-flight spectroscopy

Yuan, Kaijun; Cheng, Lina; Cheng, Yuan; Guo, Qing; Dai, Dongxu; Yang, Xueming
December 2008
Review of Scientific Instruments;Dec2008, Vol. 79 Issue 12, p124101
Academic Journal
In this article, we report an experimental method for studying tunable vacuum ultraviolet (VUV) photochemistry using the H-atom Rydberg tagging technique. In this method, two VUV laser light beams were generated using nonlinear four-wave mixing scheme in a single Kr gas cell: one VUV beam is fixed at the 121.6 nm wavelength to probe the H-atom product through the Lyman α transition, the other beam can be tunable for photodissociating molecules in the wavelength range λVUV=121–190 nm. Preliminary results on the H2O photodissociation in the B state are reported here. These results suggest that the experimental method is a powerful tool for investigating photodissociation dynamics in the VUV region for molecules involving H-atom processes.


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