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Development of S K-edge NEXAFS spectroscopy using soft x-ray in the atmosphere and solution conditions

Introduction The interface between metal and organic molecule plays the central role in developing new bio-related devices as has been extensively studied. For example, metal-molecular interface between gold and sulphur (SAu) atoms has received considerable attention over the years because of its strong chemical bond; thus, we pay attention to this strong bond in the present work. NEXAFS spectroscopy using vacuum ultraviolet and soft x-ray is a powerful tool to reveal the electronic structures for bio-molecules such as DNA and Proteins because the K shells of the atoms of bio-molecules exist in this energy region (from 100eV to 3000eV). However, the problem lies in the fact that most of soft x-ray spectroscopy usually work under vacuum condition. For the development of bio-molecular devices, it is significant to reveal the molecular dynamics under atmospheric environments. Accordingly, we have recently developed the instrumental system that allows us to measure wet samples under atmospheric conditions using fluorescence yield method. In the present report, we describe the results for the measurement of the S K-edge NEXAFS spectroscopy for L-cysteine [HSCH2CH (NH2) COOH] molecule of adsorbed state and in aqueous solution.