<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>, Velocity, and Charge Dependence of Zero-Degree Electron "Cusps" from Charge Transfer to Continuum States of Bare and Highly Ionized Projectiles

Abstract

Data on continuum electron capture and loss for bare and highly ionized ${\mathrm{C}}^{q+}$, ${\mathrm{O}}^{q+}$ ions traversing Ar at energies 1.6-2.8 MeV/A reveal striking disagreements with corresponding theories. We demonstrate a velocity-independent ($\ensuremath{\sim}{Z}^{2.2\ifmmode\pm\else\textpm\fi{}0.2}$) scaling for continuum capture by bare ions, a $Z$-independent velocity scaling, and an approximately $q$-independent ($q=6, 7, 8$) equality of continuum electron-capture and-loss cross sections at velocities corresponding to \ensuremath{\sim}2 MeV/A.