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Observation of high-lying resonances in the H- ion


Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/6907

Observation of high-lying resonances in the H- ion

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Title: Observation of high-lying resonances in the H- ion
Author: Harris, Philip G.
Advisor(s): Bryant, Howard
Committee Member(s): Donahue, Joey
Finley, J. Daniel III
McNeil, Bob
Bassalleck, Bernd
Department: University of New Mexico. Dept. of Physics & Astronomy
Subject: Hydrogen ion
High-lying resonances
LC Subject(s): Electron nuclear double resonance.
Hydrogen ions.
Degree Level: Doctoral
Abstract: 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-. These ‘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- 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 to 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 ‘P resonances, and verify a new Rydberg-like formula for the modified Coulomb potential.
Graduation Date: May 1990
URI: http://hdl.handle.net/1928/6907

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