FRAGMENT-ION DESORPTION FROM SULFUR-CONTAINING AMINO ACIDS BY LOCALIZED CORE-LEVEL EXCITATION

Yuji Baba, Tetsuhiro Sekiguchi and Iwao Shimoyama
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Yuji Baba: Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken, 319-1195, Japan
Tetsuhiro Sekiguchi: Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken, 319-1195, Japan
Iwao Shimoyama: Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki-ken, 319-1195, Japan

Surface Review and Letters (SRL), 2002, vol. 09, issue 01, 77-83

Abstract: The desorption of fragment ions from sulfur-containing amino acids following the sulfurK-edge photoexcitation has been investigated using monochromatized synchrotron radiation. The samples investigated are pellets of neutral L-cystine, L-cysteine and L-methionine. It was found that only atomic S+ions are desorbed following the S1s→ σ*resonant excitations, while various kinds of molecular fragment ions containing carbon, nitrogen and oxygen atoms are desorbed by the low-energy electron irradiation. The photon-energy dependencies of theS+yields approximately resemble those of the total electron yields (TEY's). On the other hand, the edge-jump ratios, defined asIon/Ioff, whereIonis the intensity at the core-to-valence resonance energy andIoffis that at off-resonance energy, for theS+-yield curves are by more than ten times higher than those of the corresponding TEY curves. The edge-jump ratios and the partial electron yield spectra revealed that the low-energy electrons produced following the Auger decays scarcely contribute to the ion desorption. Also, it was elucidated that theS*desorption is induced by the direct core-to-valence excitation which is followed by the SKLLAuger decay. It was concluded that the core-to-valence resonant photoexcitation and succeeding specific S–S and S–C bond scissions play a major role in the ionic fragmentation in the present amino acids.

Date: 2002
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DOI: 10.1142/S0218625X02002130

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