Multiphoton double ionisation of Ba via Ba+ Article

cited authors

  • Eichmann, U; Zhu, Y; Gallagher, TF

fiu authors


  • In the spectral region 560-610 nm the multiphoton double ionisation of Ba is dominated by sharp resonances of incompletely determined origin. By selectively populating specific low lying states of Ba+ with a secondary laser system the authors show unambiguously that the multiphoton double ionisation of Ba proceeds via real Ba+ intermediate states. Specifically, by comparing multiphoton double ionisation spectra with and without the population of selected Ba+ states the authors can identify the initial Ba+ states for multiphoton double ionisation as the Ba+ 6s1/2, 5d3/2 and 5d5/2 states. The wavelengths of the observed Ba2+ features can be assigned with confidence as multiphoton resonances to Ba+ intermediate states, and these assignments are confirmed in some cases by the wavelength of the Ba2+ photoionisation threshold and the angular distributions of the electrons ejected in the production of Ba2+.

publication date

  • December 1, 1987

Digital Object Identifier (DOI)

start page

  • 4461

end page

  • 4471


  • 20


  • 17