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A: Fachverband Atomphysik
A 6: Scattering Processes
A 6.4: Talk
Monday, March 2, 2009, 17:45–18:00, VMP 6 HS-E
Coherent electron emission from H2 and Young type interference in swift ion and electron collisions — D. Misra, S. Chatterjee, and •Lokesh C. Tribedi — Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India
The coherent electron emission from the inversion-symmetric homonuclear diatomic molecule H2, carry the signature of the Young type electron interference [1,2]. In a new approach we have shown that instead of taking H2-to-2H DDCS ratios one can use the forward backward asymmetry in electron emission to obtain the oscillation due to interference. Bare fast C and F available from Pelletron accelerator at TIFR and 8 keV electron beam was used for these experiments. The frequency in 160∘ was found to be a factor of two higher w.r.t. 20∘. The difference in the oscillation frequency for the forward and backward angles causes the oscillation in the asymmetry parameter. A model calculation based on Cohen-Fano model joined together with the frequency difference in forward-backward angles, fits the spectrum well. Since this study does not need any atomic target, can be applied for other diatomic molecular targets: a step forward towards the study of Young type interference in ionizations of molecule. Besides first order interference our data provides a strong support for the evidence of a double frequency component in interference oscillations as predicted earlier by Stolterfoht [2].
[1] H. D. Cohen and U. Fano, Phys. Rev. 150, 30 (1966).
[2] N. Stolterfoht et al., Phys. Rev. Lett. 87, 023201 (2001).
[3] D. Misra, Phys. Rev. Lett. 92, 153201 (2004).
[4] D. Misra, Phys. Rev. A-Rapd comm. 74, 060701(R) (2006).