Observation of the geometric phase effect in the H + HD → H<sub>2</sub> + D reaction.
basic_science · Level V
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- Record sourced from PubMed, PMID 30545885.
- Also identified by DOI 10.1126/science.aav1356.
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Abstract
Theory has established the importance of geometric phase (GP) effects in the adiabatic dynamics of molecular systems with a conical intersection connecting the ground- and excited-state potential energy surfaces, but direct observation of their manifestation in chemical reactions remains a major challenge. Here, we report a high-resolution crossed molecular beams study of the H + HD → H<sub>2</sub> + D reaction at a collision energy slightly above the conical intersection. Velocity map ion imaging revealed fast angular oscillations in product quantum state-resolved differential cross sections in the forward scattering direction for H<sub>2</sub> products at specific rovibrational levels. The experimental results agree with adiabatic quantum dynamical calculations only when the GP effect is included.