Origins of Very-Low and Zero-Energy Electron Structures in Strong-Field Ionization with Intense Mid-IR Pulses

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

Wolter, B.^1 ; Lemell, C.^2 ; Baudisch, M.^1 ; Pullen, M.G.^1 ; Tong, X.-M.^3 ; Hemmer, M.^1 ; Senftleben, A.^4 ; Sclafani, M.^1 ; Schröter, C.D.^5 ; Ullrich, J.^5,6 ; Moshammer, R.^5 ; Burgdörfer, J.^2 ; Biegert, J.^1,7

ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, Castelldefels (Barcelona), Spain^1

Institute for Theoretical Physics, Vienna University of Technology, Vienna, Austria^2

Center for Computational Sciences, University of Tsukuba, Ibaraki, Japan^3

Universitat Kassel, Institut für Physik and CINSaT, Kassel, Germany^4

Max-Planck-Institut für Kernphysik, Heidelberg, Germany^5

Physikalisch-Technische Bundesanstalt, Braunschweig, Germany^6

ICREA-Institució Catalana de Recerca i Estudis Avancats, Barcelona, Spain^7

关键词: Classical simulation;    Coincidence detection;    Electron energies;    Electron structures;    Low energy structures;    Strong field ionization;    Strong-field approximations;    Tunneling ionization;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/5/052055/pdf
DOI  :  10.1088/1742-6596/635/5/052055

来源: IOP

【 摘 要 】

Intense long wavelength (λ ≥ 2 μm) laser pulses enable experiments in the tunneling ionization regime (γ1) and reveal surprising low electron energy features, which can not be described with the strong-field approximation (SFA). These features, universal for all target species, include the low-energy structure (LES), the very-low-energy structure (VLES) and the zero-energy structure (ZES). Using full 3D electron-ion coincidence detection in combination with our ultrafast 160 kHz mid-IR source, we reveal the entire 3D momentum spectrum well below 1 eV. Quantum and classical simulations allow for an interpretation of the LES, VLES and of the newly identified ZES.