Laser-induced gratings in free jets. II. Photodissociation dynamics via photofragment transient gratings
The Journal of Chemical Physics, ISSN: 0021-9606, Vol: 98, Issue: 7, Page: 5469-5476
1993
- 73Citations
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Article Description
We describe the use of photofragment transient gratings to measure populations, velocities, and translational anisotropies of nascent, state-selected photofragments. This technique is a variant of two-color laser-induced grating spectroscopy (LIGS); scanning the probe laser gives spectra that reveal fragment-state populations and scanning the grating laser, with the probe laser monitoring a specific fragment state, produces photofragment excitation (PHOFEX) spectra. The temporal behavior of the photofragment grating is used to determine speeds and translational anisotropies of the photofragments. We have demonstrated the photofragment grating method on the NO(Π, v″=0, J″) fragments produced from the near-threshold photolysis of jet-cooled NO. The grating PHOFEX spectrum yields the threshold for production of NO(Π , v″=0, J″=0.5, e)+O(P) from NO (N″=0) as 25 128.5±0.2 cm. For photolysis at 126 cm above threshold, the NO rotational distribution obtained from the probe spectrum is in good agreement with that determined from a LIF spectrum recorded simultaneously. In addition, analysis of the grating decays for stateselected NO fragments gives their speeds and anisotropies; the speeds are in excellent agreement with the known values, even for fragments with as little as 7 cm of translational energy. © 1993 American Institute of Physics.
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