Electronic transitions of nickel(II) ions in cadmium ammonium sulphate hexahydrate single crystals
TL;DR: In this paper, the optical absorption spectra of Cd(NH 4 ) 2 (SO 4 2 ·6H 2 O doped Ni 2+ at 300 and 80 K was recorded and the transitions were assigned.
About: This article is published in Solid State Communications.The article was published on 1987-10-01. It has received 1 citations till now.
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TL;DR: In this paper, the optical absorption spectrum of Cr3+ ions doped in sodium ammonium sulphate dihydrate single crystal has been studied both at room and liquid nitrogen temperatures.
Abstract: Optical absorption spectrum of Cr3+ ions doped in sodium ammonium sulphate dihydrate single crystal has been studied both at room and liquid nitrogen temperatures The observed bands were explained satisfactorily assuming octahedral symmetry for the Cr3+ ion in the crystal The crystal field parameters Dq = 1750 cm−1, B = 735 cm−1 and C = 3220 cm−1 are found to give a good fit to the observed band positions
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TL;DR: In this paper, the authors applied crystal field theory in conjunction with spectroscopic data to give quantitatively the d-shell splitting and the resulting stabilization of a transition metal ion in a crystal site of given symmetry.
423 citations
TL;DR: In this paper, the absorption spectra of crystalline hydrates of the first transition group ions have been measured with polarized light at room temperature, and with unpolarized light at a series of lower temperatures.
Abstract: The absorption spectra of crystalline hydrates of the first transition group ions have been measured with polarized light at room temperature, and with unpolarized light at a series of lower temperatures. Some new data on solution spectra have also been obtained. The values of Dq for these compounds are obtained, and are used to explain irregularities in the heats of hydration of the ions. The temperature dependence of the spectra shows that the transitions are vibration‐induced electric‐dipole transitions for the most part. The dichroism has been used to resolve some of the bands and to determine the effect of noncubic components of the crystal field.
353 citations
TL;DR: In this paper, the infra-red spectra of thin non-scattering films of NH4Cl and ND4Cl were obtained at 28°, −78° and −190°C.
Abstract: The infra‐red spectra of thin non‐scattering films of NH4Cl and ND4Cl were obtained at 28°, −78° and −190°C. A convenient low temperature transmission type cell usable for such films is described. No indication of fine structure due to free rotation of the NH4+ ions was found. Instead, evidence is presented for the existence, both above and below the λ‐point, of a torsional lattice mode involving the NH4+ ions. The limiting frequencies of the torsional oscillations were observed at about 390 and 280 cm−1 for NH4Cl and ND4Cl, respectively. These values agree quite well with the frequencies calculated on the basis of a purely electrostatic potential function. The spectra of the low temperature modifications indicate strongly that the structures belong to the space group Td1 in which the NH4+ ion symmetry is Td. Of the eight observed bands, two are assigned to the triply degenerate fundamentals ν3 and ν4, one to the overtone 2ν4, one to the combination ν2+ν4 which resonates strongly with ν3, one to the combi...
322 citations
274 citations
TL;DR: In this article, the generalized crystal field theory of Finkelstein and Van Vleck is augmented by the introduction of spin-orbit coupling and an attempt is made to account for both the spin-allowed and spin-forbidden dn, (n = 2, 8), spectral transitions of Ni(II) and V(III) complexes.
217 citations