Slow Collisions Between Highly Charged Ions And C-60: Absolute Delta E Values And Cross Sections

We present energy-gain distributions for net one- and two-electron transfer in slow Ar-q+-C-60 collisions. The Delta E-spectra for the former peak at Delta E(1) = 12.9 +/- 0.4 (nl = 7s and 7p), 15.5 +/- 1.0 (n = 10), 15.1 +/- 0.5 (n = 11), and 13.8 +/- 0.4 eV (n = 12) for q = 8, 13, 14, and 15, respectively. The total reaction cross sections are sigma(tot) = 4.6 +/- 1.4 (q = 8), 10.1 +/- 2.8 (q = 13), 7.1 +/- 2.0 (q = 14), and 10.0 +/- 3.1 (q = 15) in units of 10(-14) cm(2). These results are discussed within a simple qualitative model in which the transient localization of the positive charge on the C-60(+) ion just after transfer of one electron is a free parameter.