All remarks and questions put by referees were accepted and treated adequately. We are indebt to the referees for their comments and suggestions that improved a quality of the paper.The general quality of the figures was checked. Also the picture of alanine molecules was included in the manuscript. References were improved. The figure captions were made clearer. The Tables were checked and only at one point it was found the mismatch with the error value presented in Figure (this was value at 60 eV and 150 deg.). The error value in Table 1 was corrected.The relation between the inelastic cross section shown in previous Figure 2 and now Figure 3 and the absorption potential contribution Va(r) to the electron-atom interaction approximate optical potential was more clearly stated.We defined more explicitly few physical quantities: the f i () function of formula (4) & (6), and the dispersion functions evoked in the 2 nd § of the page 5.We discussed the dependence of the IAM approximation (p4) on the type of bond and on delocalization of electrons.In the experimental part we have explained the procedure used for the calibration of the electron energy scale.We compared the absolute elastic cross sections of alanine to those of smaller organic systems such as THF and THFA.
AbstractDifferential cross sections (DCSs) for elastic scattering of electrons from alanine, have been measured using a crossed beam system for incident energies between 20 eV and 80 eV and scattering angles from 10 o to 150 o . The experimental data were placed upon an absolute scale by normalisation to calculated absolute integral cross sections obtained using the corrected independent atom method incorporating an improved quasifree absorption model. The calculated data-set includes DCSs and integral elastic and inelastic cross sections in the incident energy range between 1 eV and 10000 eV. These theoretical results are found to agree very well with the experimental data both in the shape and magnitude of DCSs except at the smallest scattering angles.
Here we report how interference and scattering-enhanced absorption act together to produce the golden wing patches of the burnished brass moth. The key mechanism is scattering on rough internal surfaces of the wing scales, accompanied by a large increase of absorption in the UV-blue spectral range. Unscattered light interferes and efficiently reflects from the multilayer composed of the scales and the wing membranes. The resulting spectrum is remarkably similar to the spectrum of metallic gold. Subwavelength morphology and spectral and absorptive properties of the wings are described. Theories of subwavelength surface scattering and local intensity enhancement are used to quantitatively explain the observed reflectance spectrum.
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