Revealing the Cooper minimum of N_2 by Molecular Frame High-Harmonic Spectroscopy. Bertrand, J., B., Wörner, H., J., Hockett, P., Villeneuve, D., M., & Corkum, P., B. Physical Review Letters, 109(14):143001, American Physical Society, 10, 2012.
Revealing the Cooper minimum of N_2 by Molecular Frame High-Harmonic Spectroscopy [link]Website  doi  abstract   bibtex   
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.
@article{
 title = {Revealing the Cooper minimum of N_2 by Molecular Frame High-Harmonic Spectroscopy},
 type = {article},
 year = {2012},
 pages = {143001},
 volume = {109},
 websites = {http://link.aps.org/doi/10.1103/PhysRevLett.109.143001},
 month = {10},
 publisher = {American Physical Society},
 day = {4},
 id = {dc38d9ce-5fd5-38bf-b808-805680dd34c4},
 created = {2012-12-17T15:07:24.000Z},
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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.},
 bibtype = {article},
 author = {Bertrand, J. B. and Wörner, H. J. and Hockett, P. and Villeneuve, D. M. and Corkum, P. B.},
 doi = {10.1103/PhysRevLett.109.143001},
 journal = {Physical Review Letters},
 number = {14}
}

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