2-DIMENSIONAL STATE-RESOLVED IMAGING AFTER UV-LASER INDUCED DESORPTION - NO NIO(111)/

We present an experimental set-up which can image state selectivity th e two-dimensional angular distribution of neutrals or ions desorbing f rom a surface after UV-laser excitation together with the velocity flu x distribution of a single rovibronic state in a single experiment. Th e method combines a state selective detection method like resonance en hanced multiphoton ionization (REMPI) with an imaging technique. This method is particularly fast in comparison to other one-dimensional met hods and ideal for systems where the substrate is modified via irradia tion with laser light. The normally used set-up in state resolved lase r desorption experiments for two-dimensional imaging [1] is limited to look at the azimuthal distribution. We report on results of the deter mination of angular distributions of NO desorbing from NiO(111) after excitation with 193 nm (6.4 eV) laser light. The velocity flux distrib utions also obtained are compared to former one-dimensional experiment s performed in our laboratory.