https://doi.org/10.1140/epjd/e2016-70165-x
Regular Article
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
Berlin,
Germany
2 Department of Physical Sciences, The
Open University, Walton
Hall, Milton
Keynes, MK7 6AA,
UK
a
e-mail: masin@mbi-berlin.de
b
e-mail: J.Gorfinkiel@open.ac.uk
Received:
4
March
2016
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.
© The Author(s) 2016. This article is published with open access at Springerlink.com
This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
