Energy- and angle-resolved ionization of H2+ interacting with xuv subfemtosecond laser pulses
Entidad
UAM. Departamento de QuímicaEditor
American Physical Society.Fecha de edición
2015-07-29Cita
10.1103/PhysRevA.92.013426
Physical Review A 92.1 (2015): 013426
ISSN
1094-1622 (online); 1050-2947 (print)DOI
10.1103/PhysRevA.92.013426Financiado por
We gratefully acknowledge fruitful discussions with Dr. A. Palacios. This work was accomplished with an allocation of computer time from Mare Nostrum BSC and CCCUAM and was partially supported by European Research Council Advanced Grant No. XCHEM 290853, MINECO Project No. FIS2013-42002-R, ERA-Chemistry Project No. PIM2010EEC-00751, European Grant No. MC-ITN CORINF, European COST Action XLIC CM1204, and the CAM project NANOFRONTMAG. H.B. acknowledges support for mobility from ITN CORINF and is grateful for the hospitality of the Universidad Autónoma de Madrid. R.E.F.S. acknowledges FCT - Fundacao para a Ciencia e Tecnologia, Portugal, Grant No. SFRH/BD/84053/2012Proyecto
Gobierno de España. FIS2013-42002-R; info:eu-repo/grantAgreement/EC/FP7/290853; info:eu-repo/grantAgreement/EC/FP7/264951; Comunidad de Madrid. S2013/MIT-2850/NANOFRONTMAGVersión del editor
http://dx.doi.org/DOI:10.1103/PhysRevA.92.013426Materias
Degrees of freedom (mechanics); Ionization; Ionization of gases; Kinetic energy; QuímicaDerechos
©2015 American Physical Society.Resumen
We present an extension of the resolvent operator method to extract fully differential ionization probabilities resulting from the interaction of ultrashort laser pulses with H2+ by including all electronic and vibrational (dissociative) degrees of freedom. The wave function from which ionization probabilities are extracted is obtained by solving the time-dependent Schrödinger equation in a grid for the case of H2+ oriented parallel to the polarization direction of the field. The performance of the method is illustrated by using pulses in the xuv domain. Correlated kinetic-energy (CKE) and correlated angular and nuclear kinetic-energy (CAKN) spectra have been evaluated and used to analyze the underlying mechanisms of the photoionization process. In particular, for pulses with a central frequency ω=0.8 a.u., which is smaller than the vertical ionization potential of H2+, we show the opening of the one-photon ionization channel by decreasing the pulse duration down to less than 1 fs. An analysis of the CKE and CAKN spectra allows us to visualize individual contributions from one- and two-photon ionization processes, as well as to study the variation of these contributions with pulse duration. The latter information is difficult to extract when only the kinetic energy release (KER) spectrum is measured. This points out the importance of performing multiple-coincidence measurements for better elucidation of competing ionization mechanisms, such as those arising when ultrashort pulses are used
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Google Scholar:Catoire, Fabrice
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Rivière, Paula
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Niederhausen, Thomas
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Bachau, Henri
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Martín García, Fernando
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Silva, Ricardo E. F.
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