Published in Physical Review A, Volume 68, Issue 033401, September 5, 2003, pages 033401-1-033401-9.
Copyright © 2003 American Physical Society. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society. The following article appeared in Physical Review A and may be found at http://dx.doi.org/10.1103/PhysRevA.68.033401.
NOTE: At the time of publication, the author Glen Gillen was not yet affiliated with Cal Poly.
Using high-resolution photoelectron spectroscopy and 120-fs, 800-nm Ti:sapphire laser pulses, we observe and analyze intensity-dependent resonant population of specific intermediate excited states of neutral magnesium atoms and their subsequent photoionization in the laser field. Various participating states are identified using angular-momentum selection rules, partial yields, and angular distributions. Several unexpected results are observed and discussed, including peaks that do not correspond to expected resonant processes, and order-to-order variations in the photoelectron spectra.