Unified ab initio treatment of attosecond photoionization and Compton scattering

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DOIResolve DOI: http://doi.org/10.1088/0953-4075/42/20/205601
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TypeArticle
Journal titleJournal of Physics B: Atomic, Molecular and Optical Physics
Volume42
Issue20
Pages205601-1205601-8; # of pages: 8
Subjectattosecond; laser; ionization; photoelectron; molecular
AbstractWe present a new theoretical approach to attosecond laser-assisted photo- and Compton ionization. Attosecond x-ray absorption and scattering are described by y(¹,²)-matrices, which are coherent superpositions of ‘monochromatic’ S(¹,²)-matrices in a laser-modified Furry representation. Besides refining the existing theory of the soft x-ray photoelectron attosecond streak camera and spectral phase interferometry (ASC and ASPI), we formulate a theory of hard x-ray photoelectron and Compton ASC and ASPI. The resulting scheme has a simple structure and leads to closed-form expressions for ionization amplitudes. We investigate Compton electron interference in the separable Coulomb–Volkov continuum with both Coulomb and laser fields treated non-perturbatively. We find that at laser-field intensities below 10¹³ Wcm⁻² normalized Compton lines almost coincide with the lines obtained in the laser-free regime. At higher intensities, attosecond interferences survive integration over electron momenta, and feature prominently in the Compton lines themselves. We define a regime where the electron ground-state density can be measured with controllable accuracy in an attosecond time interval. The new theory provides a firm basis for extracting photo- and Compton electron phases and atomic and molecular wavefunctions from experimental data.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NPARC number15209991
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Record identifier2e96bfb4-ac8c-4f65-a9ef-ae88e4703c18
Record created2010-07-12
Record modified2016-05-09
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