Charge Changing and Excitation Cross Sections for 1-25 KEV Hydrogen Ions and Atoms Incident on Sodium.
We report measurements of charge changing and excitaton cross sections for 1-25 keV beams of hydrogen atoms and ions incident on a sodium vapor target. The charge changing cross sections are for reactions in which the incident H ion or atom gains or loses an electron during a collision with a Na atom to form a hydrogen ion or atom in a different charge state. The six cross sections measured are (sigma)(,+0) and (sigma)(,+-) for incident protons, (sigma)(,-0) and (sigma)(,-+) for incident H('-) ions, and (sigma)(,g-) and (sigma)(,g+) for incident H(1s) atoms. Measurements are also reported for the negative, neutral, and positive equilibrium fractions for H beams in thick Na targets. The excitation cross sections are for reactions in which the Na target atom is excited to the 3p level by a collision with a H atom or ion. The five cross sections measured are for incident H('+), H(,2)('+), H(,3)('+), and H('-) ions, and for H(1s) atoms. These cross sections are measured using a new technique that compares them directly to the known cross section for excitation by electron impact.
- Pub Date:
- Physics: Atomic