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Communication: Near edge x-ray absorption fine structure spectroscopy of aqueous adenosine triphosphate at the carbon and nitrogen K-edges
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Near edge x-ray absorption fine structure(NEXAFS)spectroscopy at the nitrogen and carbon K-edges was used to study the hydration of adenosine triphosphate in liquid microjets. The total electron yield spectra were recorded as a function of concentration, , and the presence of sodium,magnesium, and copper ions . Significant spectral changes were observed upon protonation of the adenine ring, but not under conditions that promote -stacking, such as high concentration or presence of , indicating that NEXAFS is insensitive to the phenomenon. Intramolecular inner-sphere association of did create observable broadening of the nitrogen spectrum, whereas outer-sphere association with did not.
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