TY - JOUR
T1 - A semi-empirical concept for the calculation of electron-impact ionization cross-sections of neutral and ionized fullerenes
AU - Deutsch, H.
AU - Scheier, Paul
AU - Becker, K.
AU - Märk, T. D.
N1 - Funding Information:
This work was partially supported by the Österreichischer Fonds zur Förderung der Wissenschaftlichen Forschung, Wien, Austria and the EU Commission network program, Brussels. One of us (K.B.) wishes to acknowledge partial financial support from the U.S. National Aeronautics and Space Administration (NASA) through award NAG5-8971.
PY - 2003/1/15
Y1 - 2003/1/15
N2 - We have developed a semi-empirical approach to the calculation of cross-section functions (absolute value and energy dependence) for the electron-impact ionization of several neutral and ionized fullerenes C60q+ (q=0-3), for which reliable experimental data have been reported. In particular, we propose a modification of the simplistic assumption that the ionization cross-section of a cluster/fullerene is given as the product of the monomer ionization cross-section and a factor ma, where "m" is the number of monomers in the ensemble and "a" is a constant. A comparison between our calculations and the available experimental data reveals good agreement for q=0, 1, and 3. In the case of the ionization of C602+ (q=2), our calculation lies significantly below the measured cross-section which we interpret as an indication that additional indirect ionization processes are present for this charge state.
AB - We have developed a semi-empirical approach to the calculation of cross-section functions (absolute value and energy dependence) for the electron-impact ionization of several neutral and ionized fullerenes C60q+ (q=0-3), for which reliable experimental data have been reported. In particular, we propose a modification of the simplistic assumption that the ionization cross-section of a cluster/fullerene is given as the product of the monomer ionization cross-section and a factor ma, where "m" is the number of monomers in the ensemble and "a" is a constant. A comparison between our calculations and the available experimental data reveals good agreement for q=0, 1, and 3. In the case of the ionization of C602+ (q=2), our calculation lies significantly below the measured cross-section which we interpret as an indication that additional indirect ionization processes are present for this charge state.
KW - Cluster
KW - Electron impact
KW - Fullerenes
KW - Ionization cross-sections
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U2 - 10.1016/S1387-3806(02)00775-3
DO - 10.1016/S1387-3806(02)00775-3
M3 - Article
AN - SCOPUS:0037437567
SN - 1387-3806
VL - 223-224
SP - 1
EP - 8
JO - International Journal of Mass Spectrometry and Ion Processes
JF - International Journal of Mass Spectrometry and Ion Processes
ER -