An investigation of the triplet state dynamics of p-chloroaniline by microwave induced changes in the phosphorescence intensity and by triplet .LAR. singlet absorption.
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概要
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The phosphorescent triplet state T<SUB>1</SUB> of <I>p</I>-chloroaniline (PCA) in a <I>p</I>-xylene host, in a neat crystal (n-trap), and in a PCA crystal doped with <I>p</I>-dichlorobenzene (x-trap) has been studied with the aid of phosphorescence spectra, optically detected zero-field magnetic resonance, and T<SUB>1</SUB>←S<SUB>0</SUB> absorption spectra at temperatures below 4.2 K. The dynamic properties, particularly the radiative properties, of the individual spin states of T<SUB>1</SUB> are discussed in detail using the emission spectra for each spin state obtained with microwave techniques. For the x-trap system, the emissions from the T<I><SUB>y</SUB></I> and T<I><SUB>z</SUB></I> sublevels are found to be coincident in contrast to the other two systems. From this observation, it is suggested that the characters of the T<I><SUB>y</SUB></I> and T<I><SUB>z</SUB></I> states of normal PCA are mixed together in the x-trap.<BR>The populating rates for the individual spin states were examined for the PCA crystal systems as a function of the excitation energy, when the excitation was induced by light having wavelengths in the T<SUB>1</SUB>←S<SUB>0</SUB> absorption region. The relative populating rates thus obtained are dependent on the excitation energy. Therefore, it is concluded that the spin alignment produced by direct optical pumping from the ground state to the triplet manifold of the crystal is conserved during the vibrational relaxation and energy transfer processes. By using this unique wavelength dependence of the populating rates, the nature of the n- and x-traps is discussed and the vibrational structure of the T<SUB>1</SUB>←S<SUB>0</SUB> spectrum is analyzed.
著者
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Nishi Nobuyuki
The Institute For Solid State Physics The University Of Tokyo
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KINOSHITA Minoru
The Institute for Solid State Physics, The University of Tokyo
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Kinoshita Minoru
The Institute For Solid State Physics The University Of Tokyo
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