Effect of the third π∗ resonance on the angular distributions for electron-pyrimidine scattering

Mašin, Zdeněk and Gorfinkiel, Jimena D. (2016). Effect of the third π∗ resonance on the angular distributions for electron-pyrimidine scattering. The European Physical Journal D, 70(7), article no. 151.

DOI: https://doi.org/10.1140/epjd/e2016-70165-x

Abstract

We present a detailed analysis of the effect of the well known third π ∗ resonance on the angular behaviour of the elastic cross section in electron scattering from pyrimidine. This resonance, occurring approximately at 4.7 eV, is of mixed shape and core-excited character. Experimental and theoretical results show the presence of a peak/dip behaviour in this energy range, that is absent for other resonances. Our investigations show that the cause of the peak/dip is an interference of background p-wave to p-wave scattering amplitudes with the amplitudes for resonant scattering. The equivalent resonance in pyrazine shows the same behaviour and the effect is therefore likely to appear in other benzene-like molecules.

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