ケイ皮酸のリン光および励起スペクトル
1972 年 35 巻 2 号 p. 90-93
詳細
1972 年 35 巻 2 号 p. 90-93
Experimental studies were carried out in order to obtain the true phosphorescence and excitation spectra of cinnamic acid. The phosphorescence spectrum measured at 77°K has three peaks, 19600, 18300 and 16950 cm-1, having intervals of 1350 cm-1. The value is very near to the intervals of 1500 cm-1 obtained in the S-T absorption spectrum at room temperature. The excitation spectrum is consistent with the absorption spectrum of the same concentration. The fact means that quantum yield of the phosphorescence of cinnamic acid does not depend on the wave length of excitation light.
An experimental device using a vacuum thermocouple was made in order to measure the number of photon of monochromatic light. The measurement using the device has a good reproducibility, compared with a quantum counter using standard fluorescent materials in which a trace of impurities disturbs the reproducibility.
