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Two-color photoionization of helium above the N=2 ionization threshold

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Grosges, T. Piraux, Bernard [UCL] Bachau, H.

We study two-color photoionization of helium in the region of the 3s3d D-1 autoionizing state with resonant excitation of the intermediate 2s2p P-1 autoionizing state. We show that the corresponding time-dependent Schrodinger equation may be solved by expanding the total wave function on a few complex energy states. Perimetric coordinates are used to describe correlation effects accurately. Populations at the end of the interaction as well as photoionization probabilities are studied as a function of the laser pulse duration acid both frequencies. Our calculations show that many continua play a crucial role at high intensities. [S1050-2947(99)06308-8].

Document type Article de périodique (Journal article) – Article de recherche
Publication date 1999
Language Anglais
Journal information "Physical review. A, Atomic, molecular, and optical physics" - Vol. 60, no. 2, p. 1371-1376 (1999)
Peer reviewed yes
Publisher American Physical Soc (College Pk)
issn 1050-2947
e-issn 1094-1622
Publication status Publié
Affiliation UCL - SC/PHYS - Département de physique
Links
  1. Karapanagioti N. E., Charalambidis D., Uiterwaal C. J. G. J., Fotakis C., Bachau H., Sánchez I., Cormier E., Effects of coherent coupling of autoionizing states on multiphoton ionization, 10.1103/physreva.53.2587
  2. Feshbach Herman, A unified theory of nuclear reactions. II, 10.1016/0003-4916(62)90221-x
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  4. Pekeris C. L., Ground State of Two-Electron Atoms, 10.1103/physrev.112.1649
  5. Yang Binwei, Pont Marcel, Shakeshaft Robin, van Duijn Ernst, Piraux Bernard, Description of a two-electron atom or ion in an ac field using interparticle coordinates, with an application toH−, 10.1103/physreva.56.4946
  6. Pont Marcel, Shakeshaft Robin, Decomposition of the two-electron-atom eigenvalue problem, 10.1103/physreva.51.257
  7. Reinhardt W P, Complex Coordinates in the Theory of Atomic and Molecular Structure and Dynamics, 10.1146/annurev.pc.33.100182.001255
  8. Wintgen D, Delande D, Double photoexcitation of1P0states in helium, 10.1088/0953-4075/26/14/004
  9. Fano U., Effects of Configuration Interaction on Intensities and Phase Shifts, 10.1103/physrev.124.1866
  10. Cormier E, Lambropoulos P, Optimal gauge and gauge invariance in non-perturbative time-dependent calculation of above-threshold ionization, 10.1088/0953-4075/29/9/013
  11. Huens Etienne, Piraux Bernard, Dynamical stabilization of atoms in intense laser pulses accessible to experiment, 10.1103/physreva.47.1568
  12. Scrinzi Armin, Piraux Bernard, Two-electron atoms in short intense laser pulses, 10.1103/physreva.58.1310
  13. Parker Steven D., McCurdy C.William, Propagation of wave packets using the complex basis function method, 10.1016/s0009-2614(89)87316-6
  14. Kono Akihiro, Hattori Shuzo, Energy levels forS,P, andDstates in He through precision variational calculations, 10.1103/physreva.34.1727
  15. Lindroth E., Calculation of doubly excited states of helium with a finite discrete spectrum, 10.1103/physreva.49.4473
  16. Fang T. K., Chang T. N., Doubly excited resonance structures in He photoionization from1s2s1,3Smetastable states, 10.1103/physreva.56.1650
Bibliographic reference Grosges, T. ; Piraux, Bernard ; Bachau, H.. Two-color photoionization of helium above the N=2 ionization threshold. In: Physical review. A, Atomic, molecular, and optical physics, Vol. 60, no. 2, p. 1371-1376 (1999)
Permanent URL http://hdl.handle.net/2078.1/44221