Photoemission in the NO molecular frame induced by soft-x-ray elliptically polarized light above the N(1s)(-1) and O(1s)(-1) ionization thresholds
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abstract
Complete experiments in inner-shell photoionization of linear molecules are achieved by combining the velocity vector correlation method, based on imaging and time-of-flight-resolved electron-ion-ion coincidence technique, with the use of elliptically polarized light. We report here on the molecular frame photoelectron angular distributions (MFPADs) obtained using this method in a single experiment performed with elliptically polarized light, for a site selective K -shell ionization of the NO molecule in the region of the N (1s)-1 and O (1s)-1 shape resonances. For a comparable photoelectron energy the N (1s)-1 and O (1s)-1 MFPADs display a remarkable symmetry in the inversion with respect to the emission center of the NO molecule, while revealing common features such as, in particular, the dominant role of p and f partial-wave channels in the photoelectron emission. A large molecular frame circular dichroism is observed. These results are well predicted by multichannel Schwinger configuration interaction calculations (MCSCI), which provide additional information for N O+ (3) and N O+ (1) multiplet specific photoionization reactions. The analysis of the photoelectron-ion-ion kinetic energy correlation characterizes the ionic fragmentation channels populated after Auger decay of the N O+ (1 s O) -1 ionic states. 2007 The American Physical Society.
