TY - JOUR
T1 - A semi-empirical method for the calculation of cross sections for the electron-impact ionization of negatively charged fullerenes
AU - Scheier, Paul
AU - Deutsch, H.
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 programme, 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 extended our previously developed semi-empirical method for the calculation of cross section functions (absolute value and energy dependence) for the electron-impact ionization of the neutral fullerenes C60 and C70 and of the ionized fullerenes C60q+ (q=1-3) to the calculation of multiple ionization processes of the negatively charged fullerenes Cm- (m=60, 70, and 84). Systematic trends and tendencies are highlighted and a detailed comparison with available experimental data is made. Predictions are also made for cross sections for the ionization of the neutral fullerene C84 up to charge state z=6. An attempt is made to elucidate the origin of an experimentally observed scaling law that relates the ratio of the measured ionization cross sections of different fullerenes m and m′, σ-1,z(m)/σ-1,z(m′), where the subscript "-1" refers to the fact that the initial target is negatively charged and "z" denotes the charge state of the final ion, to the corresponding ratio of the geometric cross sections σgeom(m)/σgeom(m′) to the power "z".
AB - We extended our previously developed semi-empirical method for the calculation of cross section functions (absolute value and energy dependence) for the electron-impact ionization of the neutral fullerenes C60 and C70 and of the ionized fullerenes C60q+ (q=1-3) to the calculation of multiple ionization processes of the negatively charged fullerenes Cm- (m=60, 70, and 84). Systematic trends and tendencies are highlighted and a detailed comparison with available experimental data is made. Predictions are also made for cross sections for the ionization of the neutral fullerene C84 up to charge state z=6. An attempt is made to elucidate the origin of an experimentally observed scaling law that relates the ratio of the measured ionization cross sections of different fullerenes m and m′, σ-1,z(m)/σ-1,z(m′), where the subscript "-1" refers to the fact that the initial target is negatively charged and "z" denotes the charge state of the final ion, to the corresponding ratio of the geometric cross sections σgeom(m)/σgeom(m′) to the power "z".
KW - Cluster
KW - Electron impact
KW - Fullerenes
KW - Ionization cross sections
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U2 - 10.1016/S1387-3806(02)00943-0
DO - 10.1016/S1387-3806(02)00943-0
M3 - Article
AN - SCOPUS:0037437636
SN - 1387-3806
VL - 223-224
SP - 703
EP - 711
JO - International Journal of Mass Spectrometry
JF - International Journal of Mass Spectrometry
ER -