Laser and Particle Beams



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 c1 , P.  NICOLOSI  a2 and L.  POLETTO  a2
a1 National Centre for Plasma Science and Technology (NCPST) and School of Physical Sciences, Dublin City University, Dublin 9, Ireland
a2 Istituto Nazionale per la Fisica della Materia, Universita di Padova, Via Granenigo, Padova, Italia

Article author query
hirsch js   [Google Scholar] 
kavanagh kd   [Google Scholar] 
kennedy et   [Google Scholar] 
costello jt   [Google Scholar] 
nicolosi p   [Google Scholar] 
poletto l   [Google Scholar] 
 

Abstract

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.

(Received November 1 2003)
(Accepted February 17 2004)


Key Words: Barium; Imaging; Laser plasma; Photoabsorption; Vacuum ultraviolet.

Correspondence:
c1 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: john.costello@dcu.ie


Related Content