Abstract
Films of a polypeptide, polyglutamic acid, were cast onto silver foil backing and exposed to aqueous solutions containing, variously, tin, chlorine, bromine, and phosphorus in ionic form. After thorough rinsing and drying, the films were examined by Auger Emission Spectroscopy (AES) in a vacuum of 10 −8 torr. The film exposed to tin and chlorine ions revealed large concentrations, totaling at least 50% of a monolayer, of those elements at the surface, whereas the film exposed to the solution containing bromine and phosphorus showed virtually no traces of them at all. However, the bromine-phosphorus-treated film showed a much higher stability to the electron beam than the stannous chloride-treated film, and there was also much less oxygen at the surface of the former. The investigation confirmed that Auger Emission Spectroscopy could be a powerful tool in this type of work.
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