Photoionization of helium by attosecond pulses: Extraction of spectra from correlated wave functions
EntityUAM. Departamento de Física de la Materia Condensada
PublisherAmerican Physical Society
10.1103/PhysRevA.87.053405Physics review A 87.5 (2013): 053405
ISSN1050-2947 (print); 1094-1622 (online)
Funded byThis work was supported by the G¨oran Gustafsson Foundation, the Swedish Science Research Council (VR), the European COST Action CM0702, the FWF-Austria, Grants No. P21141-N16 and No. P23359-N16, the SFB ViCoM, SFB NextLite, and in part by the National Science Foundation through XSEDE resources provided by NICS and TACC under Grant No. TG-PHY090031. L.A. acknowledges support from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement No. 290853, and the MICINN Project No. FIS2010-15127. J.F. acknowledges support from the NSF through a grant to ITAMP and by the European Research Council under Grant No. 290981 (PLASMONANOQUANTA). R.P. acknowledges support by the TU Vienna Doctoral Program Functional Matter. M.L. acknowledges funding by the Vienna Science and Technology Fund (WWTF) through Project No. MA09-030
Projectinfo:eu-repo/grantAgreement/EC/FP7/290981; Gobierno de España. FIS2010-15127; info:eu-repo/grantAgreement/EC/FP7/290853
Rights© 2013 American Physical Society
We investigate the photoionization spectrum of helium by attosecond XUV pulses both in the spectral region of doubly excited resonances as well as above the double ionization threshold. In order to probe for convergence, we compare three techniques to extract photoelectron spectra from the wave packet resulting from the integration of the time-dependent Schrodinger equation in a finite-element discrete variable representation basis. These techniques are projection on products of hydrogenic bound and continuum states, projection onto multichannel scattering states computed in a B-spline close-coupling basis, and a technique based on exterior complex scaling implemented in the same basis used for the time propagation. These methods allow one to monitor the population of continuum states in wave packets created with ultrashort pulses in different regimes. Applications include photo cross sections and anisotropy parameters in the spectral region of doubly excited resonances, time-resolved photoexcitation of autoionizing resonances in an attosecond pump-probe setting, and the energy and angular distribution of correlated wave packets for two-photon double ionization
Google Scholar:Argenti, Luca - Pazourek, Renate - Feist, Johannes - Nagele, Stefan - Liertzer, Matthias - Persson, Emil - Burgdörfer, Joachim - Lindroth, Eva
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