Branching ratio of the H sup minus ( n =2) shape resonance

• Published in: Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 1992-12, Vol.46:11
• Main Authors: Halka, M., Bryant, H.C., Johnstone, C., Marchini, B., Miller, W., Mohagheghi, A.H., Tang, C.Y., Butterfield, K.B., Clark, D.A., Cohen, S., Donahue, J.B., Gram, P.A.M., Hamm, R.W., Hsu, A., MacArthur, D.W., MacKerrow, E.P., Quick, C.R., Tiee, J., Rozsa, K.
• Format: Article
• Language: English
• Subjects: ANIONS; ATOMIC AND MOLECULAR PHYSICS; BEAMS; CHARGED PARTICLES; CROSS SECTIONS; DATA; ENERGY LEVELS; EXCITED STATES; EXPERIMENTAL DATA; HYDROGEN 1 MINUS BEAMS; HYDROGEN IONS; HYDROGEN IONS 1 MINUS; INFORMATION; ION BEAMS; IONIZATION; IONS; NUMERICAL DATA 664200 > Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-); PHOTOIONIZATION; RESONANCE
• ISSN: 1050-2947; 1094-1622
• DOI: 10.1103/PhysRevA.46.6942

The relative photodetachment cross section for decay into the H({ital N}=2) channel by the {sup 1}{ital P}{degree} shape resonance in H{sup {minus}} was measured, as well as that for decay into all channels. The branching ratio {sigma}({ital N}=2)/{sigma}(total) was computed for a series of energies between 10.95 and 11.3 eV after normalizing the cross sections to theoretical peak amplitudes. The maximum branching ratio ({approx}0.8) appears at an energy about 20 meV higher than the central energy of the resonance. Results are compared with recent theoretical calculations.