| Summary: | 碩士 === 國立交通大學 === 物理研究所 === 106 === Tunneling and multiphoton absorption are two prominent mechanisms of atomic photoionization under stong field.
Photoelectron spectra, transition mechanisms of a Helium ion in 3P state under linerily polarized pulses in the barrier suppression ionization (BSI) regime are presented in detail by solving the time-dependent Schrodinger equation with stong filed approximation. In BSI, the initial state energy level lies above the effective Coulomb barrier suppressed by the field. The photoelectron peak emerges from small energy in contrast to being centered at higher energy as the case of ionization from the ground state.We will focus on the case of linearly polarized pulse in the BSI regime.
Keywords: Strong-field approximation, Multiphoton ionization, Tunneling ionization, Above-thershold ionization, Barrier suppression ionization
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