Effect of the third π∗ resonance on the angular distributions for electron-pyrimidine scattering*
1 Max-Born Institute for Nonlinear
Optics and Short Pulse Spectroscopy, Max-Born-Strasse 2A, 12489
2 Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
b e-mail: J.Gorfinkiel@open.ac.uk
Received in final form: 19 May 2016
Published online: 12 July 2016
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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