50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 64, Number 4
Monday–Friday, May 27–31, 2019;
Milwaukee, Wisconsin
Session S01: Poster Session III (4:00pm-6:00pm)
4:00 PM,
Thursday, May 30, 2019
Wisconsin Center
Room: Hall A
Abstract: S01.00022 : Negative ion formation in fullerene molecules C$_{\mathrm{44}}$, C$_{\mathrm{74,\thinspace }}$C$_{\mathrm{100}}$ and C$_{\mathrm{136}}$: determination of their electron affinities
Preview Abstract
Abstract
Authors:
Alfred Z Msezane
(Clark Atlanta University)
Zineb Felfli
(Clark Atlanta University)
In the context of fullerene negative ion catalysis, fullerenes for organic
solar-cells, sensor technology, etc. here we investigate the variation of
the electron affinity (EA) with the fullerene size from C$_{\mathrm{44}}$ to
C$_{\mathrm{136}}$ and contrast their EAs with that of C$_{\mathrm{60}}$. In
fullerene molecule negative ion formation, it has been demonstrated for the
first time that the ground state anionic binding energies (BEs) extracted
from our Regge-pole calculated electron elastic scattering total cross
sections (TCSs) for the C$_{\mathrm{20}}$ through C$_{\mathrm{92}}$
fullerenes matched excellently the measured EAs of these fullerenes [1, 2].
The Regge-pole methodology requires no assistance whatsoever from either
experiment or other theory for the remarkable feat. This provides a novel
approach to the determination of reliable EAs for complex heavy systems.
Here we have used the robust Regge-pole methodology to investigate negative
ion formation in the fullerenes C$_{\mathrm{44}}$, C$_{\mathrm{74}}$,
C$_{\mathrm{100}}$ and C$_{\mathrm{136}}$ through the low-energy electron
elastic TCSs calculations. The TCSs are found to be characterized generally
by Ramsauer-Townsend minima, shape resonances and dramatically sharp
resonances manifesting ground and metastable anionic formation during the
collisions. The extracted ground state anionic binding energies (BEs) from
the TCSs for C$_{\mathrm{44}}$, C$_{\mathrm{74}}$, C$_{\mathrm{100}}$ and
C$_{\mathrm{136}}$ are 3.25eV, 4.03eV, 3.67eV, 3.75eV, respectively. These
correspond to the EAs of the fullerene molecules and demonstrate the wide
variation from fullerene to fullerene. The BEs will be contrasted with those
of the standard C$_{\mathrm{60}}$ and other fullerenes as well. 1. A. Z.
Msezane and Z. Felfli, Chem. Phys. \textbf{503}, 50 (2018); 2. Z. Felfli and
A. Z. Msezane, Euro Phys. J. D \textbf{72,} 78 (2018)