ALTERATION OF THE LIFETIMES OF AUTOIONIZING RYDBERG STATES BY A CIRCULARLY-POLARIZED MICROWAVE FIELD

Autoionizing Rydberg states in zero field exhibit lifetimes scaling as the cube of the principal quantum number, n(3), but in a linearly pol arized static or microwave field the lifetimes scale as n(4) due to l mixing. To mimic the effects of collisions with charged particles we h ave examined the effect of a circularly polarized field on the decay r ate and find longer lifetimes than in a linearly polarized field, but not an n(5) dependence. (C) 1997 American Institute of Physics.