Controlling the atomic-orbital-resolved photoionization for neon atoms by counter-rotating circularly polarized attosecond pulses
Mao-Yun Ma, Junping Wang, Wen-Quan Jing, Zhong Guan, Zhi-Hong Jiao, Guo‐Li Wang, Jian-Hong Chen, Song-Feng Zhao
Abstract
We theoretically investigate the atomic-orbital-resolved vortex-shaped photoelectron momentum distributions (PMDs) and ionization probabilities by solving the two-dimensional time-dependent Schrödinger equation (2D-TDSE) of neon in a pair of delayed counter-rotating circularly polarized attosecond pulses. We found that the number of spiral arms in vortex patterns is twice the number of absorbed photons when the initial state is the ψ m =±1 state, which satisfy a change from c 2 n +2 to c 2 n ( n is the number of absorbed photons) rotational symmetry of the vortices if the 2p state is replaced by 2 p + or 2 p − states. For two- and three-photon ionization, the magnetic quantum number dependence of ionization probabilities is quite weak. Interestingly, single-photon ionization is preferred when the electron and laser field corotate and ionization probabilities of 2 p − is much larger than that of 2 p + if the proper time delay and wavelength are used. The relative ratio of ionization probabilities between 2 p − and 2 p + is insensitive to laser peak intensity, which can be controlled by changing the wavelength, time delay, relative phase and amplitude ratio of two attosecond pulses.