Session L1: Poster Session II (4:00 pm - 6:00 pm)
4:00 PM–4:00 PM, Wednesday, June 15, 2011
Room: Atrium Ballroom BC
Abstract ID: BAPS.2011.DAMOP.L1.141
Abstract: L1.00141 : Photo-multidetachment and Fragmentation of C$_{60}^-$
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Abstract 
Authors:
R.C. Bilodeau
(Western Michigan U., Kalamazoo MI)
M. Hoener
(Western Michigan U., Kalamazoo MI)
N. Berrah
(Western Michigan U., Kalamazoo MI)
S. Schippers
(Justus-Liebig-Universitat, Giessen)
A. M\"{u}ller
(Justus-Liebig-Universitat, Giessen)
D.A. Esteves
(U. of Nevada, Reno NV)
R. Phaneuf
(U. of Nevada, Reno NV)
N.D. Gibson
(Denison U., Granville OH)
C.W. Walter
(Denison U., Granville OH)
A. Aguilar
(LBNL-ALS, Berkeley CA)
J.M. Rost
(Max-Planck-Institut, Dresden)
Absolute single-photon multi-detachment and fragmentation cross sections of C$_{60}^-$ fullerene anions have been measured as a function of energy with the merged ion-photon beam apparatus at the ALS. Multiple electron ejection was substantial at all photon energies, allowing product charge states up to C$_{60}^{3+}$ to be measured. We argue that $q$-fold detachment spectra of C$_{60}^-$ relate directly to $q$-fold ionization of neutral C$_{60}$, except the loosely bound excess electron of C$_{60}^-$ results in a significant change of the energy scale and increase of the absolute cross section, with otherwise little change in the structure. Fragmentation into cations of C$_{58}$ and C$_{56}$ was also studied. We conclude from the determination of appearance thresholds that fragmentation occurs at significantly lower photoexcitation energies in C$_{60}^-$ than in C$_{60}$.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DAMOP.L1.141