Optical and Raman investigation of NH4Cl:Cu2+
- 20 September 1987
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 20 (26) , L641-L647
- https://doi.org/10.1088/0022-3719/20/26/002
Abstract
The authors have explored the centre II formed in NH4Cl:Cu2+ crystals by means of optical absorption and Raman spectroscopy. The crystal-field spectrum of centre II is shown to be composed of three bands, consistent with its D4h symmetry. An analysis of peak positions suggests NH3-Cu2+ and Cl--Cu2+ distances close to 1.9 and 2.4AA respectively. At 14K the crystal-field bands assigned as b2g(xy) to a1g and eg(xz;yz) to a1g show nice vibronic progressions corresponding to Omega =400+or-15 cm-1. Raman spectroscopy reveals the presence of a sharp peak corresponding to Omega O=445cm-1. Both Omega and Omega O frequencies are associated with the NH3-Cu2+ symmetric stretching of the (CuCl4(NH3)2)2- unit. This difference reflects higher NH3-Cu2+ distances for the excited states due to the promotion of an additional electron to the strongly anti-bonding a1g level.Keywords
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