Zeros in the photoionization partial cross sections of H2+

DELLA PICCA, R.; FAINSTEIN, P. D.; MARTIARENA, M. L.; DUBOIS, A.

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

AMER PHYSICAL SOC

Año: 2008 vol. 77 p. 2270 - 2270

1050-2947

The partial cross sections for photoionization of H2+ presentstructures which are usually called Cooper-like minima. We analyze thephysical origin of these features to determine if they are associated tothe confinement of the target electron, as recently proposed byFérnandez , or to zero absorption as suggested here. A thoroughanalysis of the partial cross sections, the phase shifts, and thetransition amplitude clearly shows that the Cooper-like minimacorrespond to zero absorption. To demonstrate this we show that thephase shifts have a maximum and the transition matrix is exactly zero atthe electron momentum corresponding to where the Cooper-like minimaappear. Finally, we show that the existence of the Cooper-like minimasurvive when the vibrational degree of freedom of the target is takeninto account.