Fundamental processes of low-kinetic-energy-photoelectron diffraction for gaseous molecules.

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We investigated core-level photoionization from the viewpoint that it can serve as a low-energy-photoelectron diffraction method. For typical and simple molecules in the gas phase, we measured the molecular frame photoelectron angular distributions and recoil frame photoelectron angular distributions using a coincidence technique. The results for CO molecules showed that the back-scattered intensities depend on the kinetic energy of the photoelectron, which can, in one of the simplest cases, be attributed to a mechanism that leads an extended X-ray absorption fine structure. We compared experimental results with calculations based on X-ray photoelectron diffraction theory and found that the angular distribution comes from the interference be tween the direct photoelectron wave and the scattered waves.