Time-resolved momentum distributions of positron−electron annihilation photons were investigated for various polymers by means of positron age−momentum correlation (AMOC) spectroscopy. The momentum distribution exclusively associated with orthopositronium (o-Ps) pick-off annihilation is found to be element-specific and can sensitively probe different light atoms such as C, O, F, and Si that constitute the surface of nanometer-sized free volumes. It is demonstrated that the chemical environment around free volumes in polymers for practical use can be probed by positron annihilation AMOC spectroscopy.
No takes yet. Share an insight, caveat, or question.
Sato et al. (2009) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: