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27 August 2003 Vacuum-UV photoabsorption imaging of laser-ablated plumes
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We describe a new system based on a 1m normal incidence vacuum monochromator with corrected optics that produces a wavelength tunable and collimated vacuum-UV beam. The VUV source is a laser-generated plasma high-Z metal. The primary functin of the system is the measuremtn of time resolved 'images' or spatial distributions of photo-absorption/photoionization in expanding laser plasma plumes. This is achieved by passing the beam through the sample of interest and recording the 'footprint' of the attenuated beam on a CCD. Using the 'photoabsorption imaging' technique we track and extrat column density distriubtions in the expanding plasma plumes. We can also mesaure the plume front velocity. We have characterized the system, particulary in relation to spectral and spatial resolution and the experimental results meet very well expectations from the ray tracing done at the design phase. We present first photoabsorption images of laser produced Ca polumes from the system.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John S. Hirsch, Piergiorgio Nicolosi, Luca Poletto, Eugene T. Kennedy, Jean-Paul Mosnier, Amit Neogi, and John T. Costello "Vacuum-UV photoabsorption imaging of laser-ablated plumes", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003);


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