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Revealing the Cooper minimum of $\mathbfN_2$ by Molecular Frame High-Harmonic Spectroscopy

by: J. B. Bertrand, H. J. Wörner, P. Hockett, D. M. Villeneuve, P. B. Corkum
Physical Review Letters, Vol. 109 (Oct 2012), pp. 143001-143001, doi:10.1103/physrevlett.109.143001  Key: citeulike:11445482

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Abstract

Molecular frame high-harmonic spectra of aligned N2 molecules reveal a Cooper-like minimum. By deconvolving the laboratory frame alignment distribution, what was previously thought to be a maximum of emission along the molecular axis is found to be maxima at 35 degrees off axis, with a spectral minimum on axis. Both of these features are supported by photoionization calculations that underline the relationship between high-harmonic spectroscopy and photoionization measurements. The calculations reveal that the on axis spectral minimum is a Cooper-like minimum that arises from the destructive interference of the p and f partial wave contributions to high-harmonic photorecombination. Features such as Cooper minima and shape resonances are ubiquitous in molecular photoionization or recombination.


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