On the Temperature Dependence of the Optical Spectrum of Cu²⁺ Ions Doped in ND₄Cl(Basic) and NH₄Cl(Acidic) Crystals

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Optical absorption spectra of Cu²⁺ ions doped in ND₄Cl(basic) and NH₄Cl(acidic) crystals have been studied in the temperature range from 300 K to 173 K. An abrupt red shift of the position of the band maxima assigned to the transition ²A_1g→²E_g is observed at 248 K in ND₄Cl and at 241 K in NH₄Cl crystals and this is attributed to the ordering of coordinated molecules ND₃ and H₂O respectively. The results are compared with Cu²⁺:NH₄Cl(basic) and Cu²⁺:NH₄Br(acidic) crystals.