Double-ionization Compton profile of two-electron systems

M. A. KORNBERG; V. D. RODRÍGUEZ; J. E. MIRAGLIA

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

AMER PHYSICAL SOC

Año: 1998 vol. 57 p. 4490 - 4497

1050-2947

The double-ionization Compton profile J2+ of a two-electron system is studied using highly correlated configuration-interaction-type wave functions for the initial state. For the case of helium we calculate the double-ionization profile using an uncorrelated double-continuum final state, which is a good approximation for the kinematic conditions of high-momentum transfer. Excellent agreement with the predictions of the impulse approximation (IA) is obtained. However, the use of a double-continuum wave function accounts for an asymmetry in the profile, in contrast with the symmetric peak predicted by the IA. Results for other two-electron systems are presented within the IA, and the high-Z scaling property of the profile is found. The different momentum regions of the profile are discussed in terms of the physical mechanism of double ionization.