"In the first experiment, the stabilization process of doubly excited states in Barium was examined for the case when a laser field was used to induce stimulated emission of the excited core electron. Stabilization is referred to all the atoms that form a singly excited neutral state after being in a doubly excited autoionizing state. Relative to pure fluorescence, the application of a laser pulse which was long relative to the autoionization lifetime was found to increase the number of atoms that were stabilized. Shake-up spectra in which the principal quantum number of both electrons changes during the stimulated emission process was also clearly demonstrated.
In the second experiment, a short laser pulse (short relative to the autoionization lifetime) was used to stimulate doubly excited Calcium atoms to form a stable configuration. Because the stimulated emission process happens on a fast time scale, more atoms were stabilized before they had a chance to autoionize. As a result, much larger enhancement factors were achieved.
In the third and final experiment, a direct measurement of the oscillations between degenerate bound state configurations in a rapidly autoionizing system was clearly demonstrated. Because of the short pulse excitation, the atom was prepared in one of many accessible two-electron configurations. This state of the atom was not an energy eigenstate but a non-stationary wavepacket. The evolution of these wavepackets was monitored by changing the timing between the exciting "pump" laser and the stimulating "probe" laser"--Abstract, page iv.
Story, J. Greg
DuBois, R. D. (Robert D.), 1951-
Schmitt, John L.
Watkins, Steve Eugene, 1960-
Ph. D. in Physics
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- Laser induced stabilization of autoionizing states
- Short pulse laser induced stabilization of autoionizing states
- A direct measurement of oscillations between degenerate two-electron bound state configurations in a rapidly autoionizing system
x, 77 pages
© 2000 Heider Naim Ereifej, All rights reserved.
Dissertation - Restricted Access
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b4496739~S5
Ereifej, Heider Naim, "Stabilization of autoionizing states" (2000). Doctoral Dissertations. 1348.
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