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Natural ultramarine and alkali borate glasses doped with sulphur are investigated by means of ESR and optical spectroscopy. A comparison of optical and ESR spectra makes it possible to conclude that the blue colouring (absorption band within the range 585 nm) and the anisotropic ESR signal (gl = 2.003, g2 = 2.032, g3 = 2.051) observed both in ultramarine and alkali borate glasses doped with sulphur are conditioned by the same centres, viz. polysulphide RS, radicals. ESR studies of samples synthesized with addition of the magnetic isotope of sulphur 88S (I = 3/2) and computer calculations demonstrate that the best agreement of the theoretical spectra with experimental ones is achieved for a spin-Hamiltonian which presupposes the interaction of the unpaired electron with three magnetic nuclei. It is shown using the MO LCAO method that the model of XAB radicals with nineteen valence electrons describes satisfactorily the results obtained. MeTOnaMM 3nP €3 OIITHseCKOB CIIeKTPOCKOIIElH HCCJIenOBaHbl IIPHPOAHbIfi YJIbTpaMapkiH H Irp?JIOsH06OpaTHbIe CTeKJIa C CepOfi. CpaBHeHEle OIITHqeCKHX CneKTpOB II CneKTpOB 3nP nO3BOJIHeT 3aKJIH)YEITb, lITO ~a6nmnae~b1e KaK B YJIbTpaMapHHe, TaK II B UeJIO-9HO6OpaTHbIX cTeKnax c cepoB CHHHFI oxpama (nonoca nornoqemn B 06naCT~i 585 nm) EI aHH30TpOnHbIfi CurHan 3nP (gl = 2,003, gn = 2,032, ga = 2,051) 06ycno~ne~b1 OAHUMEl II TeMEi Hce UeHTpaMM, a EIMeHHO IlOJIACYJIb@HHHbIMH PaAuHaJlaMEl RS,. Hay-WHHe CneKTpOB 3nP obpaauo~, CHHTe3HPOBaHHbIX C n o 6 a~~a~u MarHHTHOrO H30TOna COrJIaCHe TeOPeTHqeCKHX CneKTpOB C 3KCnepHMeHTaJIbHbIMki UMeeT MeCTO EJIH CnEiN-MarHHTHbIMEi HApaMII "S. klCIIOJIb3yH MeTOA MO nKAO IIOKa3aH0, 9TO MOReJIl PanH-KaJIOB XAB C HeBHTHaHUaTbH) BaJIeHTHblMII 3JIeKTpOHaMEi ynOBJIeTBOpHTeJIbH0 OIIIICbl-BaeT IIOJlyseHHbIe Pe3YJIbTaTbI.(1 = 3/2), II npoBeneHHbIe c noMoqbH) 3BM pacseTbI ~O K~~~J I I I , TO Haunysmee raMmbTomaHa, npennonaramqero s s a u~o n e i c~s u e Hecnapemoro a n e~~p o~a c TpeMrr

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