Photoelectron angular distributions of H2+ and HHe2+ by intense circularly polarized extreme ultraviolet laser pulses

We present photoionization angular distributions of oriented symmetric (H-2(+)) and asymmetric (HHe2+) molecular ions from numerical solutions of two dimensionally reduced time-dependent Schrodinger equations as a function of ionized electron kinetic energies with intense circularly polarized attosecond extreme ultraviolet laser pulses. Simulations for the equilibrium H-2(+) show that for single-photon ionization, relative intensities of parallel and perpendicular (to the molecular axis) photoionizations are critically sensitive to laser and photoelectron wavelengths due to ionization rates strongly depending on molecular geometry. Photoionization angular distributions are rotated to particular angles indicating high-order angular momenta and strong molecular potential effects. High-energy E-e spectra show effects of laser-induced electron diffraction (LIED) as the ionized electron wavelengths approach the internuclear distance. For HHe2+, such laser parameter sensitivity is reduced due to strong localization of the electron on one atom, but strong asymmetric LIED patterns are obtained. Angular distributions for both H-2(+) and HHe2+ are also shown to be dependent on laser-pulse ellipticity and photoelectron energies.