Differential cross section measurements for electron impact on barium in ground and laser excited states
Abstract
A crossed electron-atom-laser beam geometry was employed and a new electron impact spectrometer was developed. Differential cross section (DCS) measurements for electron scattering by the ground 6s2s1 level of barium included elastic and inelastic processes. All of the DCS were extremely forward peaked with the P1 DCS often exceeding the elastic DCS for scattering angles less than 10 deg. The excited 6s6p P1 level of barium was optically pumped utilizing a tunable, single frequency dye laser. Electron scattering from this polarized atomic beam provided information on the scattering amplitudes and their relative phase. Measurements of alpha and chi were made for superelastic electron scattering corresponding to the transition throughout the angular range from -15 deg to 15 deg at 30 eV electron impact energy.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1978
- Bibcode:
- 1978PhDT........15J
- Keywords:
-
- Barium;
- Cross Sections;
- Electron Scattering;
- Excitation;
- Ground State;
- Lasers;
- Dye Lasers;
- Elastic Scattering;
- Inelastic Scattering;
- Polarized Light;
- Atomic and Molecular Physics