DECAY CHANNELS FOLLOWING 1S PHOTOEXCITATION OF NEON

The decay channels after 1s --> 3p and 1s --> 4p excitation of Ne were studied by combining two experiments using (i) time-of-Right mass spe ctrometry and (ii) threshold electron-ion coincidence measurements. Fr om the ion-yield spectra observed by these experiments, the decay chan nels for the 1s-(1)3p resonance (two-step and resonant Auger shake-off ) were estimated to be in the ratio 91%:9%; while for the 1s-(1)4p res onance the ratio was 68%:32%. It is found that the two-step channel pl ays an important role in the decay of these resonances.