Title

Separation of Recollision Mechanisms in Nonsequential Strong Field Double Ionization of Ar: The Role of Excitation Tunneling

Abstract

Vector momentum distributions of two electrons created in double ionization of Ar by 25 fs, 0.25PW/cm2 laser pulses at 795 nm have been measured using a “reaction microscope.” At this intensity, where nonsequential ionization dominates, distinct correlation patterns are observed in the two-electron momentum distributions. A kinematical analysis of these spectra within the classical “recollision model” revealed an (e,2e)-like process and excitation with subsequent tunneling of the second electron as two different ionization mechanisms. This allows a qualitative separation of the two mechanisms demonstrating that excitation-tunneling is the dominant contribution to the total double ionization yield.

Department(s)

Physics

Keywords and Phrases

Argon; Electric Field Effects; Electron Tunneling; Energy Transfer; Laser Pulses; Mathematical Models; Microscopic Examination; Polarization; Spectrum Analysis; Kinematical Analysis; Vector Momentum Distributions; Ionization

International Standard Serial Number (ISSN)

0031-9007

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2001 American Physical Society (APS), All rights reserved.

Share

 
COinS