Hamburg 2009 – scientific programme

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SYLV: Symposium Lokalisierung und Verschränkung in photoinduzierten Prozessen

SYLV 2: SYLV II

SYLV 2.1: Invited Talk

Monday, March 2, 2009, 16:30–17:00, VMP 8 HS

Coherent photoelectron emission from diatoms: Influence of scattering, recoil, and dissociation — •Kiyoshi Ueda — Tohoku University, Sendai, Japan

Coherent photoelectron emission from diatoms such as N₂ and O₂ can be regarded as Young’s double-slit experiment. In this context, we address how electron and nuclear dynamics, such as photoelectron scattering, photoelectron recoil, and molecular dissociation, affect the double-slit interference fringes. Photoelectron emission from the N 1σ_g,u core orbitals of N₂ is described as a superposition of two phase-coherent waves emitted from the two centers. The resulting interference pattern observed in the ratio of the N 1σ_g,u photoionization cross sections reveals that photoelectron scattering as well as photoelectron recoil causes significant phase shift of the double-slit interference fringes but neither reduce the visibility of the fringes nor increase the which-way predictability. Resonant photoemission from O₂ via O 1σ_g → 3σ_u^* excitation that takes place in competition with ultrafast dissociation, on the other hand, provides a showcase example that which-way predictability increases rapidly to 1 along the dissociation.