Core-level photoionization dynamics with vibronic resolution from fixed-in-space molecules

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Interaction of the soft x-ray with molecules can lead core-level photoionization. We investigated the core-level photoionization of typical and simple molecules in gas phase by means of a coincidence technique. Molecular-frame photoelectron angular distributions and recoil-frame photoelectron angular distributions were obtained for gaseous molecules. We compared between experimental results and calculated ones with x-ray photoelectron diffraction theory to discuss feasibility of new method to determine geometrical structures of gaseous molecules.