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Tracking ground state Ba+ ions in an expanding laser–plasma plume using time-resolved vacuum ultraviolet photoionization imaging

  • J.S. HIRSCH (a1), K.D. KAVANAGH (a1), E.T. KENNEDY (a1), J.T. COSTELLO (a1), P. NICOLOSI (a2) and L. POLETTO (a2)...

We report results from a study of the integrated column density and expansion dynamics of ground-state-selected Ba+ ions in a laser–plasma plume using a new experimental system—VPIF (vacuum-ultraviolet photoabsorption imaging facility). The ions are tracked by recording the attenuation of a pulsed and collimated vacuum ultraviolet beam, tuned to the 5p–6d inner-shell resonance of singly ionized barium, as the expanding plasma plume moves across it. The attenuated beam is allowed to fall on a CCD array where the spatial distribution of the absorption is recorded. Time-resolved ion velocity and integrated column density maps are readily extracted from the photoionization images.

Corresponding author
Address correspondence and reprint requests to: John T. Costello, National Centre for Plasma Science and Technology (NCPST) and School of Physical Sciences, Dublin City University, Dublin 9, Ireland. E-mail:
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Laser and Particle Beams
  • ISSN: 0263-0346
  • EISSN: 1469-803X
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