Physics & Astronomy ETDs

Publication Date



We have measured the H photodetachment cross section in the photon energy range from 1.5 to 10.5 eV, using a colliding beam method. The H beam with an energy of 800 MeV, at Los Alamos Linear Accelerator, was intersected by a nitrogen laser beam with a photon energy of 3 .678 eV in the lab frame. We changed the energy of the pho"ton in the H rest frame, through the Doppler effect, by varying the angle between the laser and the H beams. The magnitude of the Doppler shift was enough to cover the entire range from 1.5 to 10.5 eV with a single photon energy.

We have normalized our relative continuum cross section with the results of Smith and Burch which in turn were put on an absolute basis by S. Geltman. We have also compared our results with the theoretical calculations of Armstrong and of Broad and Reinhardt and found good agreement.

Degree Name


Level of Degree


Department Name

Physics & Astronomy

First Committee Member (Chair)

Howard Carnes Bryant

Second Committee Member

Christopher Dean

Third Committee Member

Christopher Pratt Leavitt

Fourth Committee Member

Joe B. Donahue

Document Type