Feasibility study of a positron lifetime spectrometer for measurements of porous and polymer films with a DC positron beam
Abstract
Positron Annihilation Lifetime Spectroscopy (PALS) is an increasingly im- portant analysis technique that can be efficiently used to characterize the free volume sizes in porous
silica and polymer thin films. In this document a design of a non-expensive lifetime spectrometer to mea- sure positron annihilation lifetime spectra in thin films with a continuous (DC)
magnetically guided slow positron beam is described. The system uses sec- ondary electrons emitted from the surface of the sample by the primary positrons in order to generate a START timing
signal. Simulation results show that the time resolution can be expected to be . 300 ps at FWHM. Show more
Publication status
publishedJournal / series
LAPP-EXP-2004.07 and INR-HEP-2004.30Publisher
LAPPOrganisational unit
03503 - Rubbia, André / Rubbia, André
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