Positronium in a Liquid Phase: Formation, Bubble State and Chemical Reactions

Figure 12

Dependence of the experimental pick-off annihilation rate constants [39] versus surface tension in different liquids. The solid curve shows the correlation given by the Tao-Eldrup at 𝜆₊=2ns⁻¹ and optimal value 𝛿=1.66Å (obtained from fitting of these data by means of (29)). The dashed curve illustrates the simplest approximation 𝜆_po∝𝜎^1/2.