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

Figure 10

(a) Temperature dependence of the Ps oxidation reaction rate constant (at an infinite time, 𝑡→∞) multiplied by the “initial” concentration of oxidizers 𝑐_ox(0) in the 𝑒⁺ blob (OH and H₃O⁺, see [13, 18] for details). 𝐷_ox is the sum of 𝐷_Ps and the diffusion coefficient of the oxidizer (OH radical, 𝐷_OH≈1.5⋅10⁻⁵ cm²/s). The obtained 𝑇-dependence agrees well with the Stokes-Einstein law, ∝𝑇/𝜂(𝑇). (b) 𝑇-dependences of the oxidation reaction radius, 𝑅_ox,Ps=𝑅_ox+𝑅_Ps, the Ps radius, 𝑅_Ps=𝑅_𝑈+1/𝜅, and the relative contact density parameter 𝜂_𝑐≈0.8 in Ps. 𝑅_ox is the radius of the oxidizer (approximately, the geometric radius of the OH radical, 1.4 Å).

(a)

(b)