Sharp Absorption Lines of V^3+-Al_2O_3 in the Near Infrared Region

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概要

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• The absorption spectra of V^3+-Al_2O_3 in the visible and near infrared regions were examined experimentally by Pryce and Runciman. The two lines (8,770 cm^<-1> and 9,660 cm^<-1>) in the near infrared region were observed at liquid nitrogen temperature by the use of a glass-prism spectrograph. We have observed two absorption lines I_1 (9,740.0 cm^<-1>) and I_2 (9,748.3 cm^<-1>) at 4.2°K, using a grating spectrograph with 2.5Å/mm dispersion. The spectral width of these lines is very narrow, which is about 0.8 cm^<-1>. Any line has not been observed in the region between 8,400 cm^<-1> and 9,800 cm^<-1>. These results are different from those by pryce and Runciman. Experiments have been made with the polarized lights of E⊥C_3 and of E//C_3 at 20°K, 4.2°K and 1.2°K (E is the electric vector of light and C_3 the trigonal axis of crystal), Zeeman effect has also been studied in a magoetic field H_0=23,400 Oe. The sample is a svnthetic vanadium corundum of 5 mm thickness which contains about 1 weight percent V_2O_3. The results in the case of E⊥C_3 and H_0=0 are schematically shown in Fig. 1(a). The relactive absorption intensity of I_1 and I_2 depends strongly on temperature. An apparent disappearance of I_1 at 1.2°K shows that the observed spacing 8.3 cm^<-1> of these lines corresponds to an initial splitting of the ground states, since the decrease of the number of ions populated in the upper level of the ground states due to the lowering of temperature makes I_1 weak. Fig. 1(b) shows the observed Zeeman patterns in the case of E_C_3 and H_0//C_3. The Zeeman patterns of I_1 and I_2 can well be accounted for, if it is assumed that both the excited state and the upper level of the ground states split into two Zeeman components in the case of H_0//C_3. The Zeeman spliting of I_2 corresponds to the Zeeman splitting of the excited state itself. Quantum number of the excited state may resonably be taken to be M==1. Then, g_0^k,〜1.35 is obtained. The observed spacing of the two components of I_2 in the case of E⊥C_3 and H_0//C_3 is interpreted as a sum of the Zeeman splitting of the ground and excited state, assuming g_g//〜1.98. This g_c// agrees well with the one obtained from the paramagnetic resonance experiment.

• 社団法人日本物理学会の論文
• 1964-06-05

著者

• Sakatsume Shinichi

  Research Institute Of Electrical Communication Tohoku University

• TSUJIKAWA Ikuji

  Research Institute for Iron, Steel and Other Metals Tohoku University

• Tsujikawa Ikuji

  Research Institute For Iron Steel And Other Metals Tohoku University

• Tsujikawa Ikuji

  Research Institute For Iron Steel And Other Metals Tohoku University:(prsent) Faculty Of Science Kyoto University

関連論文

• Sharp Absorption Lines of V^3+-Al_2O_3 in the Near Infrared Region
• Absorption Spectra of Cr^ in Al_2O_3 : Part B. Experimental Studies of the Zeeman Effect and Other Properties of the Line Spectra
• Anomalous g-shifts of Excited States of Cr^ in Ruby
• Possibility of Optical Cooling of Ruby

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