Zeros in the photoionization partial cross sections of H2+

DELLA PICCA, RENATA; FAINSTEIN, PABLO DANIEL; MARTIARENA, MARÍA LUZ; DUBOIS, ALAIN

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

The American Institute of Physics

Lugar: New York; Año: 2008 vol. 77 p. 22702 - 22702

1050-2947

The partial cross sections for photoionization of H2+ present structures which are usually called Cooper-like minima. We analyze the physical origin of these features to determine if they are associated to the confinement of the target electron, as recently proposed by Férnandez et al., or to zero absorption as suggested here. A thorough analysis of the partial cross sections, the phase shifts, and the transition amplitude clearly shows that the Cooper-like minima correspond to zero absorption. To demonstrate this we show that the phase shifts have a maximum and the transition matrix is exactly zero at the electron momentum corresponding to where the Cooper-like minima appear. Finally, we show that the existence of the Cooper-like minima survive when the vibrational degree of freedom of the target is taken into account.