Abstract
Results of angle-resolved electron spectroscopy of near-threshold photoionization of Ne atoms by combined femtosecond extreme ultraviolet and near infrared fields are presented. The dressed-electron spectra show an energetic distribution into so-called sidebands, being separated by the photon energy of the dressing laser. Surprisingly, for the low kinetic energy (few eV) sidebands, the photoelectron energy varies as a function of the emission angle. Such behavior has not yet been observed in sideband creation and has not been predicted in commonly used theoretical descriptions such as strong field approximation and soft photon approach. Describing the photoionization with a time-dependent Schrödinger equation allows a qualitative description of the observed effect, as well as the prediction of fine structure in the sideband distribution.
Highlights
18 June 2019P Johnsson, T J Kelly , B Manschwetus, T Mazza, M Meyer, C Passow, D Rompotis, L Varvarezos, A K Kazansky and N M Kabachnik
Combining extreme ultraviolet (XUV) free-electron laser (FEL) radiation with intense optical or near infrared (NIR) laser fields opens up a wide range of laser assisted photoionization experiments [1,2,3,4,5,6,7]
The low-energy photoelectrons (Ekin = 3.6 eV) are emitted into an intense NIR laser field leading to sideband structures
Summary
P Johnsson, T J Kelly , B Manschwetus, T Mazza, M Meyer, C Passow, D Rompotis, L Varvarezos, A K Kazansky and N M Kabachnik.
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