Measurements of Selected Charge Transfer Processes at Low Energies.
Abstract
Measurement of the charge transfer cross section for the process N+ + O yields N + O+ was completed during the contract year. The experiment was conducted using a crossed beam apparatus. The O atoms were formed in a microwave or rf discharge using pure O2 with traces of H2O present. Varying the amount of H2O present allowed the dissocation fraction in the O2 to the varied. This variation was needed to allow determination of the effects of other competing processes. The cross section for the above reaction was determined in the energy range from 0.5 eV to 12 eV in the center-of-mass system. The signals obtained indicated that this process does not vary rapidly with energy. The cross section was determined to be 1.2 x 10 to the -17th power sq cm at the lowest energies studied and increases to approximately 2.5 x 10 to the -17th power sq cm at 12 eV in the center-of-mass. Cross sections for the reactions Al+ + O2 yields AlO+ + O and Al + O2(+) and Al+ + N2 yields AlN+ + N and Al + N2(+) were measured during the contract period. The values determined for these processes were essentially the same as those measured previously. In addition, the upper limits determined at energies where these processes have very small probabilities were pushed to lower values. The measurements were undertaken to resolve a conflict between our data and cross section values postulated to explain results obtained in another experiment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1978
- Accession Number
- ADA069046
Entities
People
- D. A. Vroom
- J. A. Rutherford
- R. H. Neynaber