The ionization of hydrogen by a chirped XUV pulse inthe presence of a few cycle infrared laser pulse has been investigated.The electron momentum distribution has been obtained by treating theinteraction of the atom with the XUV radiation at the first order of thetime-dependent perturbation theory and describing the emitted electronthrough the Coulomb-Volkov wavefunction. The results of the calculationsagree with the ones found by solving numerically the time-dependentSchr¨odinger equation. It has been found that depending on the delaybetween the pulses the combined effect of the XUV chirp and of thesteering action on the infrared field brings about asymmetries in the electronmomentum distribution. These asymmetries may give information on boththe chirp and the XUV pulse duration.
|Numero di pagine||6|
|Stato di pubblicazione||Published - 2012|
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