摘要
The transmission spectra of cubicβ-PbF_(2) crystals grown by non-vacuum Bridgman method were measured with a spectrophotometer.It was found that there are several optical absorption bands peaking at 300 nm,390-400 nm,as well as 460 nm.According to composition analysis,doping and annealing experiments,It is suggested that the absorption at 300 nm originate from the electron transition of Ce ions from 4f→5d.The absorption at 390-400 nm may result from the color centers related to oxygen impurities.In addition,the sample recrystallized from the coloredβ-PbF2 crystal exhibits a new absorption band at 460 nm,which might be caused by trace lead vacancies.
基金
Supported by the National Natural Science Foundation of China under Grant No.59732040.
