Exponential Projectile Charge Dependence ofAr KandNe KX-Ray Production by Fast, Highly Ionized Argon Beams in Thin Neon Targets

Abstract

Yields of projectile and target $K$ x rays from collisions between ∼ 80-MeV argon ions and thin neon targets increase dramatically as the projectile charge is increased from +6 to +17. Although incrementing the projectile charge state amounts to "tuning" projectile $L$-shell energy through target $K$-shell energy, the 60-fold (∼exponential) increase in target yield and the more than 1000-fold (>exponential) increase in projectile yield can be partially understood as the effect of a rapidly changing fluorescence yield, but not as an energy-level-matching effect.