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A paramagnetic Cl-O defect produced by x irradiation of KBr:ClO4

Ravi Sekhar, Y.
Published in Journal of Chemical Physics. 1986, vol. 85, no. 9, p. 4938-4942
Abstract Experimental results on KBrClO single crystals, before and after x irradiation at 77 K, are reported. Infrared and polarized Raman spectra show clearly that the perchlorate molecules are isolated in the KBr matrix and possess Td symmetry. EPR spectra, at 9.5 and 36 GHz, of irradiated crystals at 4.2 K indicate the formation of ClO in trigonal symmetry. The g and 35Cl hyperfine tensors are found to be strictly axial and collinear. Temperature variation of the EPR spectra presented no motional averaging while uniaxial stress applied to the crystals yielded negative results. The structure of the ClO molecule is discussed in terms of a trigonal Jahn–Teller effect and a probable dissociation into (ClO–O−) complex.
Keywords Matrix isolationPotassium bromidesRadiolysisX radiationCrystal defectsElectron spin resonancePerchloratesInfrared spectraRaman spectraJahn-Teller effectRadicals
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Research group Groupe Bill
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RAVI SEKHAR, Y., BILL, Hans. A paramagnetic Cl-O defect produced by x irradiation of KBr:ClO4. In: Journal of Chemical Physics, 1986, vol. 85, n° 9, p. 4938-4942. doi: 10.1063/1.451731 https://archive-ouverte.unige.ch/unige:3093

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Deposited on : 2009-09-21

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