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We theoretically investigate the strong-field ionization of H+2 molecules in four different electronic states by calculating photoelectron angular distributions in circularly polarized fields. We find that the structure of photoelectron angular distribution depends on the molecular orbital as well as the energy of the photoelectron. The location of main lobes changes with the symmetric property of the molecular orbital. Generally, for molecules with bonding electronic states, the photoelectron's angular distribution shows a rotation of π/2 with respect to the molecular axis, while for molecules with antibonding electronic states, no rotation occurs. We use an interference scenario to interpret these phenomena. We also find that, due to the interference effect, a new pair of jets appears in the waist of the main lobes, and the main lobes or jets of the photoelectron's angular distribution are split into two parts if the photoelectron energy is sufficiently high.  相似文献   
2.
Electron collision as well as its controlling lies in the core of study on nonsequential double ionization(NSDI).A single collision occurred in a convergent time is important to disclose the essential features of the electron correlation.However,it is difficult to form such a collision.By using counterrotating circular two-color(CRTC)laser fields,we show that a single electron collision can be achieved in a convergent time and a net electron correlation is set up within the sub-femtosecond time scale in the NSDI process of Ar atoms.The proposed method is also valid for other atoms,provided that one chooses the frequency and intensity of the CRTC field according to a scaling law.  相似文献   
3.
This paper uses a nonperturbative scattering theory to study photoelectron angular distributions of homonuclear diatomic molecules irradiated by circularly polarized laser fields. This study shows that the nonisotropic feature of photoelectron angular distributions is not due to the polarization of the laser field but the internuclear vector of the molecules. It suggests a method to measure the molecular orientation and the internuclear distance of molecules through the measurement of photoelectron angular distributions.  相似文献   
4.
王懿  张敬涛  任向河  徐至展 《中国物理 B》2009,18(11):4815-4822
The photoelectron angular distributions (PADs) of hydrogen atoms in an intense laser field of linear polarization are studied using the S-matrix theory in the length gauge.The PADs show main lobes along the laser polarization and jet-like structures sticking from the waist of main lobes.Our previous prediction,based on a nonperturbative scattering theory of photoionization developed by Guo et al,showing that the number of jets on one side of PADs may increase by one,three,or other odd numbers and may decrease by one when one more photon is absorbed,is confirmed by this treatment.Within the strong-field approximation,good agreement is obtained between these two quite different treatments.We further study the influence of the Coulomb attraction to PADs,by taking a Coulomb–Volkov state as the continuum state of photoelectrons.We find that under the influence of the Coulomb attraction,the PADs change greatly but the predicted phenomena still appear.This study verifies that the jet-like structures have no relation with the angular momentum of photoelectrons.  相似文献   
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