Research Papers in Physics and Astronomy

 

Date of this Version

9-11-2015

Citation

PHYSICAL REVIEW LETTERS 115, 113004 (2015)
DOI: 10.1103/PhysRevLett.115.113004

Comments

© 2015 American Physical Society. Used by permission.

Abstract

Single ionization of He by two oppositely circularly polarized, time-delayed attosecond pulses is shown to produce photoelectron momentum distributions in the polarization plane having helical vortex structures sensitive to the time delay between the pulses, their relative phase, and their handedness. Results are obtained by both ab initio numerical solution of the two-electron time-dependent Schrödinger equation and by a lowest-order perturbation theory analysis. The energy, bandwidth, and temporal duration of attosecond pulses are ideal for observing these vortex patterns.

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