Abstract
One-photon excitonic absorption spectra of the monoclinic ZnP2 (β-ZnP2) crystals are analysed. There exist four series characterized by the serial law En = Eg — Ry/n2 + Δ/n3 with the same value of energy gap Eg = 1.6026 meV. By variational calculations of the exciton energy dependence on the anisotropy parameter, we conclude an appearance of several hydrogen-like series caused by the splitting of excitonic states with different quantum numbers l and |m| due to the low symmetry of the crystal. Conclusions are made that two series with Δ = 0 can be attributed to the P-states of an exciton, and two others with Δ ≠ 0 to the S-states of an exciton. Calculations of e–h exchange interaction in an S-exciton are performed. Splitting of the series with Δ ≠ 0 is interpreted to have exchange origin (ortho–para-splitting). Its value is obtained to be 12.7 meV.
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