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Citation: Yao Shibing*, Zhou Shaomin,
Fang Jiangling. POSITRONIUM AS A PROBE FOR CONCENTRATION CHANGES OF PHOTO-EXCITED TRIPLET STATES OF CHLOROPHYLL[J]. Acta Physico-Chimica Sinica, ;1988, 4(02): 136-140. doi: 10.3866/PKU.WHXB19880205 shu

POSITRONIUM AS A PROBE FOR CONCENTRATION CHANGES OF PHOTO-EXCITED TRIPLET STATES OF CHLOROPHYLL

1.
Department of Chemistry; Institute of Physical Chemistry; Xiamen University
Department of Physics; Xiamen University

Received Date: 20 September 1986
Available Online: 15 April 1988

The measurements of positron annihilation lifetime spectrum for chlorophyll in cyclohexane (77 K) and in alcohol (296 K) were carried out under illumination at different light intensity. A photomagnetic positronium annihilation model was proposed to explain the experimental facts. The changes of annihilation parameters I_2 and Λ_2 for frozen chlorophyll cyclohexan solution at 77 K with relative light intensity suggest that the photomagnetic quenching effect of positronium can serve to trace the concentration changes of photo-excited triplet states in photosensitive material.
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