X-Ray emission following low-energy charge exchange collisions of highly charged ions
K-shell x-ray emission following low-energy charge exchange collisions ( </=11 eV/amu) has been measured for ten bare and hydrogenic ions up to U91+. The data resolve capture into angular momentum states with l = 1 and provide a stringent test of theory. The assumption of Stark mixing of angular momentum states is inappropriate at such energies. Results from detailed calculations give a better description of the data, but significant discrepancies are noted. The measurements show that the hardness ratio of charge-exchange induced K-shell x-ray emission represents a diagnostic of the dynamics of ion-atom interactions in situations where the energy is below 1 keV/amu, e.g., in solar wind collisions.
Beiersdorfer
P
Department of Physics, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Olson
RE
Brown
GV
Chen
H
Harris
CL
Neill
PA
Schweikhard
L
Utter
SB
Widmann
K