Faraday Parameters of the Magnetic Circular Dichroism of Praseodymium Trichloride and Thulium Trichloride in Poly (vinyl alcohol) Film
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概要
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The magnetic circular dichroism and absorption spectra of PrCl<SUB>3</SUB> and TmCl<SUB>3</SUB> in polyvinylalcohol film are measured in the range of 300–700 nm. The absorption bands observed are five for PrCl<SUB>3</SUB>, the transitions from the ground state, <SUP>3</SUP>H<SUB>4</SUB>, to the excited states, <SUP>1</SUP>D<SUB>2</SUB>, <SUP>3</SUP>P<SUB>0</SUB>, <SUP>3</SUP>P<SUB>1</SUB>, <SUP>1</SUP>I<SUB>6</SUB>, and <SUP>3</SUP>P<SUB>2</SUB>, of Pr<SUP>3+</SUP>, and four for TmCl<SUB>3</SUB>, the transitions from the ground state, <SUP>3</SUP>H<SUB>6</SUB>, to the excited states, <SUP>3</SUP>F<SUB>3</SUB>, <SUP>3</SUP>F<SUB>2</SUB>, <SUP>1</SUP>G<SUB>4</SUB>, and <SUP>1</SUP>D<SUB>2</SUB>, of Tm<SUP>3+</SUP>. In order to separate the <I>C</I> term of the Faraday parameters, the temperature variation of the spectra is carried out at room temperature to 77 K. The Faraday parameters are derived from the experiment by the use of three methods; the method of moments, the graphical method, and curve fitting. The characteristics of these methods are discussed, and the uncertainty of the parameters obtained is estimated to be 30% or more. A group-theoretical consideration is applied for the interpretation of the results; this consideration fairly well explains the sign of the <I>C</I> terms obtained for PrCl<SUB>3</SUB>, but not for TmCl<SUB>3</SUB>.
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