Cooperated with the researchers at Max-Planck Institute of Nuclear Physics, Heidelberg, the researchers of Atomic and Molecular Spectroscope Group at the Institute of Modern Physics, Chinese Academy of Sciences (IMP) have studied the electron transfer and rearrangement processes in slow Ar16+-Ne collisions.
The complete kinematics of single- and double-electron capture from neon to Ar16+ was measured with a reaction microscope at a projectile energy of 3.2 keV/u (velocity vp = 0.36 a.u.). In the case of auto-ionization double capture, the three-dimensional momentum vectors of the emitted electrons were determined. The experimental cross sections for Auger decay with the electron energy Ee plotted as a function of the Q value suggest the occurrence of target excitation accompanying the population of configurations (5,7) and (6,6). The results reveal that two-step processes dominate the double capture.
The related articles have been published in Phys. Rev. A 90, (2014) 052720.
Differential cross section for ADC as a function of the Q value and electron kinetic energy in the projectile frame in Ar16+-Ne collisions at 3.2 keV/u. The numbers in parentheses represent the main quantum numbers (n,n’) of the two transferred electrons in the doubly excited projectile state, while (n, n’)*and (n, n’) ** denote DEC associated with target excitation. Events around the dashed, solid and dashed-dot lines correspond to the projectile final state of Ar15+(1s24l) and recoil-ion configurations of Ne2+(1s22s22p4), Ne2+(1s22s12p5), and Ne2+(1s22s22p33l) , respectively.