| Affiliation: | (1) CCAST (World Laboratary), P.O. Box 8730, 100080 Beijing, P.R. China;(2) Laboratory for High Intensity Optics, Shanghai Institute of Optical and Fine Mechanics, Chinese Academy of Sciences, 201800 Shanghai, P.R. China;(3) Department of Physics, Shantou University, 515063 Shantou, P.R. China |
| Abstract: | Photoelectron angular distribution (PAD) of atoms irradiated by a train of identical, circularly polarized few-cycle laser pulses is studied in the frame of a nonperturbative scattering theory. Our study shows that the PADs vary with the kinetic energy of photoelectron, the carrier-envelope phase, and the pulse duration. We find that along with increasing of the kinetic energy of photoelectron or with decreasing of the pulse duration or the both, the original one maximum of PAD splits into two maxima; the newly produced two maxima evolve to the opposite pole of the symmetric axis, and finally incorporate as a new maximum located in the symmetric axis.Received: 26 February 2004, Published online: 10 August 2004PACS: 32.80.Rm Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states) - 42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift - 42.65.Re Ultrafast processes; optical pulse generation and pulse compression |
