Abstract
Photoelectron imaging technique has been applied to study (2 + 1) REMPI of atomic iodine through 8p Rydberg states around 253 nm. Full three-dimensional state-specific speed and angular distributions of the photoelectrons were recorded. The branching ratios among the different I + levels revealed that the perturbation on ( 3P 2)8p series is particularly large among the ( 3P 2)np series. The violation of core-conserving ionization is attributed to the interactions between the ( 3P 2)8p and ( 1D 2)6p series. The photoelectron angular distributions were found to be well characterized by P 2(cos θ) and P 4(cos θ). A relatively high positive β 2 and a relatively low β 4 observed in (2 + 1) REMPI process indicated that the ionization process can be approximately considered as single-photon ionization via the weakly aligned ( 3P 2)8p intermediate states.
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