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. Author manuscript; available in PMC: 2013 Nov 4.

Published in final edited form as: J Chem Phys. 2010 Oct 21;133(15):155104. doi: 10.1063/1.3505301

Fig. 2 — (a) Electronic EEL spectra of one layer of cytosine deposited on a 3-layer spacer of Ar for different incident electron energies E₀ from 5 to 12 eV and (b) from 13 to 18 eV. The vertical scale is normalized so as the integral over an energy-loss range can be expressed in terms of a cross section value. The thin solid line passing through each spectrum results from curve fitting with of the multiple Gaussians obtained in Fig. 1 by varying only their amplitudes (i.e., keeping their energy positions and widths fixed), as shown in the bottom of Fig. 2(a).

Fig. 2 — (a) Electronic EEL spectra of one layer of cytosine deposited on a 3-layer spacer of Ar for different incident electron energies E₀ from 5 to 12 eV and (b) from 13 to 18 eV. The vertical scale is normalized so as the integral over an energy-loss range can be expressed in terms of a cross section value. The thin solid line passing through each spectrum results from curve fitting with of the multiple Gaussians obtained in Fig. 1 by varying only their amplitudes (i.e., keeping their energy positions and widths fixed), as shown in the bottom of Fig. 2(a).