论文部分内容阅读
本文用电子顺磁共振技术研究了光照条件下三十八种增感染料与溴化银之间发生的电子转移过程。增感染料和溴化银无论在黑暗处还是在光照下,均不产生ESR信号。当增感染料吸附在溴化银颗粒表面上时,如不加光照,仍看不到ESR信号。只有在光照条件下,才有可能观察到ESR信号,这主要取决于增感染料分子的最高占有能级与溴化银价带的相对位置。若染料分子的最高占有能级比溴化银价带顶部高0.7 eV,就可以观察到ESR信号,反之则观察不到。顺磁性中心是由染料正空穴Dye形成的。根据ESR信号的强度可以判断增感染料是否有较强的减感作用。
In this paper, electron paramagnetic resonance technology was used to study the electron transfer process between thirty-eight sensitizing dyes and silver bromide under light irradiation. The sensitizing dye and silver bromide did not produce ESR signals either in the dark or in the light. When the sensitizing dye is adsorbed on the surface of silver bromide particles, no ESR signal can be seen without illumination. The ESR signal is only observed under light conditions, depending on the relative position of the highest occupied level of the sensitizing dye molecule to the silver bromide valence band. The ESR signal can be observed if the highest occupied molecular level of the dye molecule is 0.7 eV above the top of the silver bromide valence band, otherwise not observed. The paramagnetic center is formed by the dye positive hole Dye. Based on the intensity of the ESR signal, it can be determined whether the sensitizing dye has a strong desensitization effect.