Absorption spectrum of Ni2+ doped in NH4Br single crystal |
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| Authors: | Griffiths Trevor R Lakshman S V J Varada Rajulu A |
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| Institution: | (1) Department of Inorganic and Structural Chemistry, University of Leeds, LS2 9JT Leeds, UK;(2) Department of Physics, S. V. University, 517 502 Tirupati, India;(3) Department of Physics, Sri Krishnadevaraya University, 515 003 Anatapur, India |
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| Abstract: | The optical absorption spectrum of Ni2+ doped in NH4Br single crystals has been studied at room and liquid-air temperatures. The observed ambient bands at 6300, 11,600, 13,400, 18,500, and 20,000 cm–1 have been assigned, respectively, to the transitions3
A
2(F)  3
T
2(F),3
T
1(F),1
E(D),1
T
2(D and3
T
1(P). The crystal field parameters evaluated areD
q=630 cm–1,B=850 cm–1, andC=3600 cm–1. In assigning the location of Ni2+ ions within the lattice, evaluations are made of the (limited) extant comparable data. It is then concluded that Ni2+ enters an octahedral interstitial, rather than a substitutional, site. It is surrounded by four bromide ions, in a plane, with two polarized water molecules at the opposing fifth and sixth positions. |
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