Asymmetry of Photoelectron Angular Distributions in Molecules by Intense Attosecond Extreme Ultraviolet Laser Pulses

• Published in: Chinese journal of chemical physics Vol. 27; no. 6; pp. 647 - 652
• Main Authors: Yu, Hua-ming, Yuan, Kai-jun, Sun, Zhi-gang
• Format: Journal Article
• Language: English
• Published: College of Sciences, Liaoning Shihua University, Fushun 113001, China%Laboratoire de Chimie Théorique, Faculté des Sciences, Université de Sherbrooke, Sherbrooke,Québec J1K 2R1, Canada%State Key Laboratory of Molecular Reaction Dynamics and Center for Theoretical and Computational Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China 27.12.2014
• Subjects: Photoelectron angular distribution; Coherent electron wave packet; Attosecond photoionization
• ISSN: 1674-0068; 2327-2244
• DOI: 10.1063/1674-0068/27/06/647-652

We present photoelectron angular distribution of the aligned molecular ion H2+ by intense ultrashort attosecond extreme ultraviolet laser pulses from numerical solutions of time-dependent Schrödinger equations. Photoionization from a superposition state of the ground 1sσg and the excited 2pσu states with pulses at photon energies above the ionization potential, ħω>Ip, and intensity 1014 W/cm2, yields pulse duration dependent asymmetry of photoelectron angular distributions. We attribute the asymmetry to the periodical oscillation of the coherent electron wave packets, resulting from the interference of the two electronic states. For the processes with long pulse durations, such duration dependence is absent and symmetric angular distributions are obtained.