Asymmetries in production of He⁺(n = 2) with an intense few-cycle attosecond pulse

Authors

Jean Marcel Ngoko Djiokap, University of Nebraska-LincolnFollow
S. X. Hu, University of Rochester
Wei-Chao Jiang, Peking University
Liang-You Peng, Peking University
Anthony F. Starace, University of Nebraska-LincolnFollow

Date of this Version

7-2013

Citation

PHYSICAL REVIEW A 88, 011401(R) (2013); DOI: 10.1103/PhysRevA.88.011401

Comments

Copyright © 2013 American Physical Society. Used by permission.

Abstract

By solving the two-electron time-dependent Schrödinger equation, we study carrier-envelope-phase (CEP) effects on ionization plus excitation of He to He⁺(n = 2) states by a few-cycle attosecond pulse with a carrier frequency of 51 eV. For most CEPs the asymmetries in the photoelectron angular distributions with excitation of He⁺(2s) or He⁺(2p) have opposite signs and are two orders of magnitude larger than for ionization without excitation. These results indicate that attosecond pulse CEP effects may be significantly amplified in correlated two-electron ionization processes.