Multi-channel Ionization Process, The Photoelectron Angular Distribution Analysis

Based on fundamental principles of quantum mechanics, such as the partial-wave expansion of the continuum wave function and the theory of angle momentum, the photoelectron angle distributions ionized from double-level energy state 4D of atomic Na through different ionization channels are studied. The angle distribution of the photoelectron ionization probability is analyzed numerically. The influence of the interference on the photoelectron distribution state is investigated. The relation between the population distribution of the atomic Na excited by light field and ionization rate is described by the density matrix equation. Based on the fundamental principles of the photoelectron imaging spectrum technology the imaging spectrum of ionization photoelectron simulated numerically. It is discovered that the photoelectron angle distribution can be controlled by modulating population distribution of the excited state via light field under some conditions. Using of this method the ionization process and photoelectron spatial distributions can be reduced. It is also useful to understand photoelectron imaging spectrum.