Abstract: In this paper, the electron spin resonance spectroscopy was used to investigate the free electrons under different temperature for 2,4-Di[α-(thiocar-boxymethyl) ethyl] deuteroporphyrin Ⅸ and 2,4-Di{α-[3-(4-carboxyl thiazo-lidinyl)] ethyl}-deuteroporphyrin Ⅸ after irradiation with ultraviolet-visible light.
The samples were irradiated in air and in vacuum, the concentration of spin (N) were found to be 10¹⁶-10¹⁷ spin/g.
Also, the Kinetic behaviour under radiation were discussed.