Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)

A 5.17: Poster

Dienstag, 3. April 2001, 12:30–15:00, AT3

Laser Plasma Sourced VUV Photoabsorption Imaging System: A Progress Report — •John T. Costello¹, Eugene T. Kennedy¹, John S. Hirsch¹, Luca Poletto², and Piergiorgio Nicolosi² — ¹NCPST, School of Physical Sciences, Dublin City University, Dublin 9, Ireland — ²Department of Electronics and Informatics, University of Padua,Via Gradenigo 6/a, 35131 Padova, Italy

We have recently completed the design phase of a system based on a 1m normal incidence vacuum monochromator with corrected (toroidal) optics and intended to produce a wavelength tuned and collimated Vacuum-UV beam (30 - 100 nm). The VUV source is a laser generated rare earth plasma. The primary function of this system (under construction at the time of writing) will be the measurement of time resolved ’images’ or spatial distributions of photo-absorption/ionization. Our new system design is significantly improved over that used in [1]. We will present the results of ray tracing calculations for various options, e.g., collimated beam and projection imaging of the sample plasma. We also expect to present first measurements from the commissioning phase of the project and if as expected at the time of writing, data are available we will present first photoasorption images of laser produced calcium plumes. These data can be compared with the results obtained in [1] from which an assessment of the system performance enhancement can be made. 1. Hirsch J S, van Kampen P, Meighan O, Mosnier J-P, Costello J T, Lewis C L S, MacPhee A, Hirst G, Westhall J and Shaikh W, J.Appl.Phys 88, 4953 (2000)