Experimental study of interactions of highly charged ions with atoms at keV energies
Abstract
This Progress Report describes the experimental work carried out, and the work in progress, at the Cornell EBIS Laboratory during the period 2/16/1990 to 6/30/1991. During this period, the absolute values of the total, one and two electron transfer cross sections for highly charged argon ions (8 less than or = q less than or = 16) colliding with helium and molecular hydrogen at 2.3 qkeV laboratory energy were measured. Although the cross sections exhibit a monotonic increase with charge or in this case with decreasing occupation number of the L shell, the detailed variations are not accounted for by current theories. These measurements are currently being extended down to 0.1 qkeV incident ion energies. In order to gain a better understanding of two and more electron capture processes, electron-recoil ion and projectile-recoil ion coincidence experiments are under way. The spectra of electrons emitted in Ar(q+)+Ar(12 less than or = q less than or = 15) collisions at 2.3 qkeV in the energy range 40 to 320 eV were recorded using a 127 degs cylindrical analyzer. These are the first electron spectra ever obtained using an EBIS as a source of low energy, highly charged ions. The fact that we were able to obtain such spectra can be attributed to the remarkably stability and reliability of our superconducting solenoid, cryogenic electron beam ions source CEBIS. Work is in progress to extend the spectral range of electrons down to a few eV and to interpret all of the observed spectral features.
- Publication:
-
Unknown
- Pub Date:
- July 1991
- Bibcode:
- 1991esih.rept.....K
- Keywords:
-
- Argon;
- Electron Transfer;
- Electronic Spectra;
- Ion Atom Interactions;
- Ionic Collisions;
- Molecular Collisions;
- Electron Capture;
- Helium;
- Hydrogen;
- Ions;
- Magnetic Coils;
- Superconductors;
- Atomic and Molecular Physics