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Time-dependent effects in the nonsequential ionization of helium at various wavelengths

Published online by Cambridge University Press:  09 April 2001

P.P. CORSO ,
D.G. LAPPAS  and
P.L. KNIGHT
P.P. CORSO
Affiliation:
Istituto Nazionale di Fisica della Materia and Dipartimento di Scienze, Fisiche ed Astronomiche dell'Universitá, via Archirafi 36, 90123, Palermo, Italy
D.G. LAPPAS
Affiliation:
Optics Section, Blackett Laboratory, Imperial College, London SW7 2BZ, United Kingdom
P.L. KNIGHT
Affiliation:
Optics Section, Blackett Laboratory, Imperial College, London SW7 2BZ, United Kingdom
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Abstract

Calculations of the double ionization of a model 1D helium atom interacting with an intense short laser pulse are presented. A substantial signature of nonsequential double ionization is found for all the wavelengths that are considered, from 248 nm to 1064 nm, provided that sufficiently short pulses are employed. We show how one can modify the size of the “knee” structure of the double ionization yield curve by varying the laser pulse duration. The underlying mechanism of the correlated double electron ejection is investigated and discussed.

Type
ULIA-1 CONFERENCE PAPERS
Information
Laser and Particle Beams , Volume 18 , Issue 3 , July 2000 , pp. 433 - 441
Copyright
© 2000 Cambridge University Press

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