Femtosecond photoelectron imaging of N2 at 410 nm

Bulletin of the Korean chemical society

Wei Guo¹  Li Wang¹  Xingqiang Lu¹  Shanshan Wei¹ 

关键词: Multiphoton ionization;    Two-step model;    Rydberg states;    Ponderomotive potential;    Resonant/ nonresonant population transfer;    Channel closure;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

We experimentally measure the kinetic energy and angular distributions of photoelectrons of N2 as a function of 410 nm femtosecond laser intensity by using velocity map imaging technique. The strong-field multiphoton ionization of molecules shares many of the characteristics with those of atoms. Electron kinetic energies are nearly independent of laser intensities. The independence suggests that the electron peaks in the photoelectron spectrum actually result from a twostep process, indicative of the occurrence of real population in the intermediate states. The relative amplitudes of electron peaks indicate that in the two-step process, nonresonant population transfer dominates for low intensities, while resonant population transfer dominates for higher intensities.

【 授权许可】

Unknown