Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.5: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Attosecond Time Delays in Photoionization of Noble Gas and Halogen Atoms — •Liang-Wen Pi and Alexandra S. Landsman — Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany

Ultrafast processes are now accessible on the attosecond time scale due to the availability of ultrashort XUV laser pulses. Noble gas and halogen atoms remain interesting targets due to their giant dipole resonance and Cooper minimum. We have calculated photoionization cross section, asymmetry parameter and Wigner time delay using the time-dependent local-density approximation (TDLDA), which includes electron correlation effects and generates qualitatively good agreement with experimental data and other theoretical calculations. The asymmetry parameter provides additional information on the electron phase in the photoionization process. We find that halogen atoms bear a strong resemblance on cross section, asymmetry parameter and time delay to their noble gas neighbors. Our predicted time delay can be tested in future attosecond experiments on these atoms and related molecules.