Low‐energy measurements of electron capture by multicharged ions from excited hydrogen atoms
- Conference date: 28 Sep − 2 Oct 1992
- Location: Manhattan, Kansas (USA)
For very low collision energies electron capture from excited hydrogen by multicharged ions is characterized by enormous cross sections, the predicted maximum being comparable to the geometric size of the Rydberg atom. The ion‐atom merged‐beams technique is being used to study these collisions for the variety of charge states and the wide range of energies (0.1 to 1000 eV/amu) accessible to the apparatus. A neutral D beam containing a Rydberg atom population proportional to 1/n3 is produced by collisional electron detachment of 8 keV D− in N2 gas. An applied electric field results in the range (n=24–11) depending on the strength of the field applied. This beam is then merged with O3 + or O5 + ion beams at low relative collision velocities where the resultant beam‐beam signal of D+ due to electron loss is dominated by electron capture. From the sharp decrease in the observed beam‐beam signal as the electric field increases it is inferred that the electron capture cross section scales as n4 increasing towards in n5 for collision energies below 1 eV/amu.
- Electron capture
- Electric fields
- Rydberg states
- Atomic and molecular beams
- Ion beams
MOST READ THIS MONTH
MOST CITED THIS MONTH
Article metrics loading...