Transversal‐longitudinal splittings of the components of the quadrupole‐active exciton level characterized by irreducible representation Γ+5 in Cu2O crystal were deduced. They arise due to long‐range dipole–dipole interaction. The transition dipole moments are proportional to the components of the exciton wave vector and essentially depend on the direction of light propagation in the crystal as regards the crystallographic directions. These transversal–longitudinal splittings unlike the case of dipole‐active exciton levels, turn to be zero when the exciton wave vector tends to zero.

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Transversal-longitudinal splittings of the components of the quadrupole-active exciton level characterized by irreducible representation G 5 in Cu 2 O crystal were deduced. They arise due to longrange dipole±dipole interaction. The transition dipole moments are proportional to the components of the exciton wave vector and essentially depend on the direction of light propagation in the crystal as regards the crystallographic directions. These transversal±longitudinal splittings unlike the case of dipole-active exciton levels, turn to be zero when the exciton wave vector tends to zero.

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