Abstract
The annihilation modes of positrons in two aromatic hydrocarbons, Acenaphtene and Guaiazulene, were investigated through lifetime spectroscopy and through a magnetic quenching experiment in the presence of a static magnetic field: by means of this technique we ascertained that the longest-lived component derives from ortho-positronium decay. Furthermore, the quenching experiment allowed us to measure the hyperfine structure interval of ground state positronium in both materials.
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