We report on numerical results of energy spectra of photoelectronsemitted by irradiating a hydrogen atom with the superposition of two pulses.The spectra have been obtained by numerical integration of the time dependentSchr¨odinger equation. The highest frequency component of the pulse has beenassumed to have low intensity and such a frequency that a single photon mayionize the atom. Its duration has been assumed to lie in the range of subfemtoseconds.The lowest frequency component that redistribute the energy of theionized electrons has an higher intensity and duration of few femtoseconds. Wefind that when the field are aligned, the electron energy spectra strongly dependon the time lag of the fields, on the carrier-envelope relative phase of the lowestfrequency pulse, and on the duration of the X-ray pulse. Moreover it has beenfound that by changing the angle between the direction of the low and high frequencyfields significant modifications to the spectra occur that could be used tomeasure the relative orientation of the fields.
|Numero di pagine||9|
|Rivista||THE EUROPEAN PHYSICAL JOURNAL. SPECIAL TOPICS|
|Stato di pubblicazione||Published - 2008|
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