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The excess energy emitted during the positronium (Ps) formation in condensedmatter may be released as light. Spectroscopic analysis of this light can be anew method of studying the electronic properties of materials. We report thefirst experimental attempt, according to our knowledge, to verify the existenceof this emission process. As a result, the possibility of the emission ofphotons during Ps formation is within the experimental uncertainty in twodifferent solids: an n-alkane and porous silica. However, it seems that the Psformation on the alkane surface is not accompanied by the emission of photonswith energy in the detection range of 1.6 - 3.9 eV. Various processes that caninfluence the energy of the photon emitted during the Ps formation arediscussed to elucidate this issue. To aid future experiments, equations weredeveloped to estimate the expected ratio of light emission events toannihilation events with the presence or absence of a photon during the Psformation.

Detection of light emission produced in the process of positronium formation