Modeling positronium beyond the single particle approximation. (29th February 2016)

• Record Type: Journal Article
• Authors: Zubiaga, A; Ervasti, M M; Makkonen, I; Harju, A; Tuomisto, F; Puska, M J
• Is Part Of: Journal of physics. Volume 49:Number 6(2016:Mar. 15)
• Publication Date: 2016-02-29
• Subjects: positronium -- positron annihilation spectroscopy -- correlated electron–positron systems; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/0953-4075/49/6/064005
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: Understanding the properties of the positronium atom in matter is of interest for the interpretation of positron annihilation experiments. This technique has a unique capability for the investigation of nanometer sized voids and pores in soft molecular materials (polymers, liquids or biostructures) and porous materials. However, detailed interpretations of the experimental data rely on modeling of the annihilation properties of positronium in the host material. New applications of the technique are being developed but the computational models still are based on single particle approaches and there is no way to address the influence of the electronic properties of the host material. In this work we discuss new directions of research.