Ionization of atoms and molecules in a strong two-color field

29th International Conference on Photonic, Electronic, and Atomic Collisions

Mi, Yonghao^1 ; Camus, Nicolas^1 ; Laux, Martin^1 ; Fechner, Lutz^1 ; Moshammer, Robert^1 ; Pfeifer, Thomas^1

Max-Planck-Institute for Nuclear Physics, Saupfercheckweg 1, Heidelberg

69117, Germany^1

关键词: Ionization of atoms;    Laser fields;    Low energy electrons;    Momentum spectra;    Nitrogen gas;    Two-color;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/9/092093/pdf
DOI  :  10.1088/1742-6596/635/9/092093

来源: IOP

【 摘 要 】

We experimentally investigated the asymmetry of photo-ion and photoelectron momentum spectra of argon and nitrogen by ionizing an argon-nitrogen gas mixture in a strong two-color (400 nm + 800 nm) laser field. By changing the time delay between the 400 nm laser pulse and the 800 nm pulse, the fan-like stripes in low-energy electron momentum shift from negative momentum to positive for both argon and nitrogen. A clear difference of asymmetric electron emission between Ar and N2is observed.