Spectroscopic study of the low‐dimensional (C3H7NH3)2CdCl4 crystal irradiated with X‐rays

The optical absorption spectra of the two‐dimensional crystals of n ‐(C3H7NH3)2CdCl4 induced by X‐ray irradiation at 20 K were studied and compared with those for the as‐received sample. It has been found that X‐irradiation causes effects similar to those observed in the related crystals of (Cn H2n +1NH3)2CdCl4 (n = 1, 2). New optical absorption bands (IR bands) were found in the region 10–17 kcm–1, besides the absorption band of the Cl2– molecular center characteristic of this compound. The absorption intensities of these bands decrease at temperatures higher than 40 K accompanying the decrease of the Cl2– concentration in n‐ (C3H7NH3)2CdCl4 crystals. These IR bands are assigned to the electron‐trapped center where an electron is trapped by an alkylammonium head in the neighborhood of a Cl– vacancy. Such a model was found to be in good agreement with the results of the X‐ray luminescence and thermoluminescence study. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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