AI Article Synopsis
- The study reports the first imaging results on the photodissociation of trans-HONO and cis-HONO, focusing on two specific bands of their transition.
- The researchers utilized advanced techniques such as resonance-enhanced multiphoton ionization and direct-current slice imaging to analyze the NO photofragment and its energy distributions.
- Findings indicate that cis-HONO exhibits greater anisotropy compared to trans-HONO, with deviations from expected dissociation patterns being linked to molecular torsion rather than lifetime effects.
Article Abstract
We present the findings of the first imaging study of trans-HONO and cis-HONO photodissociation through the [Formula: see text] band and [Formula: see text] band of the ÃA″-X̃A' transition. The NO photofragment was probed by (1 + 1) resonance-enhanced multiphoton ionization and studied using the direct-current slice imaging technique with our finite slice reconstruction method. The NO state-specific translational energy distributions show some rotational structure corresponding to the internal state distribution in the OH cofragment. All images showed a perpendicular angular distribution with a recoil anisotropy parameter from ca. -0.6 to -0.8. In both bands, cis-HONO showed greater anisotropy than trans-HONO. Deviation from the limiting value expected for a pure perpendicular dissociation is ascribed to deviation of the transition moment from normal to the heavy atom plane owing to OH torsion, rather than lifetime effects assumed in the large body of previous work.
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| http://dx.doi.org/10.1021/acs.jpca.7b08120 | DOI Listing |
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