Investigation of hole centers in KDP crystals

Oxygen hole paramagnetic centers in γ-irradiated DKDP single crystals

“…As it was mentioned above, in the DKDP crystal investigated in this work the ESR signals from the hole centers have a doublet hyperfine structure with almost the same distance between the lines, as in KDP [2,3,[5][6][7][8][9]. There are two assumptions concerning the nature of the hyperfine structure in the ESR spectra of the hole centers.…”

“…O centers didn't exceed 0 0007 b The powder ESR spectra of the hole centers in DKDP were investigated in work [10] The disappearance of this radical may be caused by the electron capture: Valence band holes tend to be trapped at negatively charged acceptor defects. The oxygen B O center is probably formed near 3 3 PO ion or near 3 3 XO defect, where X is, e.g.…”

“…The hyperfine line splitting into two components observed in ESR spectra was attributed to the interaction of unpaired spin with a proton spin ( ). However, the hyperfine line splitting typical for the hyperfine interaction of unpaired spin of the hole center with a deuteron spin ( ) isn't observed in the ESR spectra of the deuterium version of the hole centers [4,5,7,8] formed in DKDP. This result shows that hyperfine structure of the hole centers have another nature.…”

“…Paramagnetic properties of the two types of the hole centers arising in KDP under various kinds of irradiation and optical characteristics of the crystals containing these centers have been studied in work [8]. The observed centers are refereed to a hole localized in a p-orbital of the O hole centers.…”

“…Two types of the hole centers slightly different from one another in spin-Hamiltonian constants have been investigated in works [6][7][8][9][10]. It is found that the hole centers formed under various kind of irradiation (x-, -, UV, neutron, electron irradiations) have the same structure [5][6][7][8][9][10]. Their stabilization at the temperatures close to room one is connected with crystal lattice imperfections.…”