Observation of high-lying resonances in the H sup minus ion

Technical Report · Tue May 01 00:00:00 EDT 1990

DOI:https://doi.org/10.2172/6903110· OSTI ID:6903110

Harris, P G ^[1]

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1. Los Alamos National Lab., NM (USA) New Mexico Univ., Albuquerque, NM (USA). Dept. of Physics and Astronomy

This dissertation reports the observation of several series of resonances, for which both electrons are in excited states, in the photodetachment cross section of H{sup {minus}}. These {sup 1}P doubly-excited states interfere with the continuum in which they are embedded, and appear as dips in the production cross section of excited neutral hydrogen. The experiment was performed by intersecting an 800 MeV H{sup {minus}} beam with a (266 nm) laser beam at varying angles; the relativistic Doppler shift then tuned'' the photon energy in the barycentric frame. The process was observed by using a magnet strong enough the strip the electrons from the excited hydrogen atoms in selected states n and detecting the resulting protons, which allowed the isolation of the individual n channels. Three resonances are clearly visible in each channel. The data support recent theoretical calculations for the positions of doubly-excited {sup 1}P resonances, and verify a new Rydberg-like formula for the modified Coulomb potential.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6903110
• Report Number(s): LA-11843-T; ON: DE90012239
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
BEAMS
CALCULATION METHODS
CHARGED PARTICLES
CROSS SECTIONS
DATA
ELECTRIC FIELDS
ELECTRON DETACHMENT
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HYDROGEN 1 MINUS BEAMS
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
INFORMATION
ION BEAMS
IONS
NUMERICAL DATA
RESONANCE