Photoelectron spectroscopy of laser-dressed atomic helium
Abstract
Photoelectron emission from excited states of laser-dressed atomic helium is analyzed with respect to laser intensity-dependent excitation energy shifts and angular distributions. In the two-color XUV (exteme ultra\-violet) -- IR (infrared) measurement, the XUV photon energy is scanned between 20.4 and the ionization threshold at 24.6, revealing electric dipole-forbidden transitions for a temporally overlapping IR pulse (\!e12 ). The interpretation of the experimental results is supported by numerically solving the time-dependent Schr\"odinger equation in a single-active-electron approximation.
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