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On the gross structure of sidebands in the spectra of laser-assisted Auger decay

The sidebands arising in the electron spectra of laser-assisted Auger decay of atoms are theoretically analysed for femtosecond infrared laser pulses. It is shown that in angle-resolved measurements the sideband spectra exhibit a rather robust gross structure which depends on the laser wavelength and intensity, but is practically independent of the laser pulse duration and of the delay time between the laser pulse and the x-ray pulse which induces the Auger transition. While the origin of the sidebands is the interference between the Auger electrons emitted at the same phase but at different periods of the laser field, the gross structure appears due to interference between electrons emitted during one period. The gross structure strongly varies with the observation angle. It disappears in angle integrated measurements.