B. Borca et al., Threshold effects on angular distributions for multiphoton detachment by intense elliptically polarized light - art. no. 133001, PHYS REV L, 8713(13), 2001, pp. 3001
Unusual threshold effects are found theoretically in the frequency and inte
nsity dependence of angular distributions produced by an elliptically polar
ized laser as well as in the elliptic dichroism parameter, which measures t
he asymmetry of the angular distribution.