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(a) Schematic representation of sample scanning and spot size. (b) C K x-ray emission spectra, taken at a resonant energy of hνexc = 288.5 eV using five different scanning speeds. (c) XPS C 1s detail spectrum and Voigt-profile fit analysis of an evaporated cysteine layer, revealing the spectral contributions from three different chemical carbon environments. The residual of the fit is shown just above the abscissa, and the assignment of peak positions and chemical bonding follows Ataman et al. 8
C K RIXS map of evaporated cysteine. (a)–(g) label integration regions used to derive resonant x-ray emission spectra (a)–(c) and decay-channel-specific x-ray absorption spectra (d)–(g) shown in Fig. 3 . Vibrational losses at the Rayleigh line are marked “A.”
XAS and XES spectra of cysteine at the C K edge. The topmost panel shows a non-resonant emission spectrum excited with hνexc = 320 eV (black), compared to an XES spectrum obtained by the summation of regions (a)–(c) in Fig. 2 (red). Also, the PFY-XAS spectrum obtained by the summation over the regions (f) and (g) is shown. (a)–(c) denote resonantly excited emission spectra obtained by integration over regions (a)–(c) in the RIXS map in Fig. 2 . (d)–(g) DCS-XAS spectra obtained by summation over regions (d)–(g) in the RIXS map, respectively.
Combined graph of C K XAS (black) and C 1s XPS (red) spectra of solid cysteine. In gray, fit results for the XPS peak analysis are also shown. All peaks/resonances are labeled according to the association with one of the non-equivalent carbon atom environments.
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