| Title | Comparative study of H(2s) and H(2p(0)) ionization dynamics in the over-barrier regime |
| Authors | Song, Shu-Na Geng, Ji-Wei Jiang, Hong-Bing Peng, Liang-You |
| Affiliation | Peking Univ, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China. Peking Univ, Dept Phys, Beijing 100871, Peoples R China. Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China. |
| Keywords | TUNNELING IONIZATION SUPPRESSION REGIME LASER FIELD NOBLE-GASES ATOMS RATES TIME RADIATION ENERGY |
| Issue Date | 2014 |
| Publisher | physical review a |
| Citation | PHYSICAL REVIEW A.2014,89,(5). |
| Abstract | We investigate theoretically the ionization dynamics of H(2s) and H(2p(0)) by short midinfrared laser pulses in the over-barrier ionization (OBI) regime. Through the numerical solution to the time-dependent Schrodinger equation, we calculate the differential and angular distributions of photoelectrons as well as the total ionization probability. In a wide range of laser intensities and wavelengths, significant differences are found between the H(2s) and H(2p(0)) states in both the differential and total ionization yields. Analysis of the excitation dynamics reveals that both the low-lying excited states and the Rydberg states are significantly populated for a 1200-nm laser. As the laser wavelength gradually increases to 2100 nm, the population on the low-lying excited state drastically decreases. We observe the population of the Rydberg states oscillates as a function of the laser peak intensity, which gradually disappears when the Keldysh parameter. decreases. As the laser intensity increases further, the total ionization probability and the population of the Rydberg states stay almost the same, which is related to the partial stabilization phenomena recently confirmed in experiments. In the deep OBI regime, we find that this kind of ionization suppression is more obvious in the 2s state than in the 2p(0) state. We also compare the transverse momentum distributions of the electrons ionized from the two states and find the effect of the Coulomb potential is stronger in the 2p(0) state than that in the 2s state, which is due to the different initial electron distributions. |
| URI | http://hdl.handle.net/20.500.11897/296189 |
| ISSN | 1050-2947 |
| DOI | 10.1103/PhysRevA.89.053411 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 人工微结构和介观物理国家重点实验室 |
