What does PAL stand for?

Positron annihilation lifetime spectroscopy (PALS) as a sensitive nanoprobe to study the nanoscale microstructure has been widely used.

After subtraction of the random coincidence background, the positron annihilation lifetime spectra of inert gases would represent the sums of exponentials with characteristic annihilation rate constants [[lambda].

Topics of the 17 papers include glassy and rubbery polymers, highly permeable polymers, glassy polymers, substituted polyacetylenes, perfluoropolymers, polyimides, zeolite membranes, carbon membranes, polymer membranes for organic liquids, solid-state facilitated transport membranes for the separation of olefins/paraffins and oxygen/nitrogen, using a unified approach to membrane permeation using a solution-diffusion model, and using such methods as positron annihilation lifetime spectroscopy for free volume evaluation in polymers.

Positron Annihilation Lifetime Measurements A brief description of the positron method is in place before we describe how the lifetime measurements are made.

FTIR and positron annihilation lifetime spectroscopy were used to study the interaction of the two phases.

Positron Annihilation Lifetime Measurements Positron annihilation lifetime spectra were recorded for the pure polymers and their blends using Positron Lifetime Spectrometer.

w] materials investigated by means of positron annihilation lifetime spectroscopy (PALS) and gel permeation chromatography (GPC).