Fe^(++)/Fe^(+++)掺杂明胶的感光性能研究

Study on Photosensitivity Characteristics of AgBrI Emulsion Containning Gelatin Dopped with Fe^(++)/Fe^(+++)

Fe^(+)/Fe^(+++)掺杂明胶作为二成熟用胶,对于实验碘溴化银乳剂的感光性能产生不同的影响。明胶中Fe^(+++)的存在对于照相乳剂产生较强减感作用,而且随Fe^(+++)的含量增加这种作用愈明显;而明胶中Fe^(++)仅当其含量较高时,才显示出对明胶的减感作用,但其影响程度小于Fe^(+++)。吸收光谱研究表明:Fe^(++)的这种减感作用可能来自化学成熟过程中部分Fe^(++)被氧化成了Fe^(+++)所致。

Different influence on photosensitivity characteristics of AgBrI emulsion of gelatin dopped with Fe++/ Fe+++ ions which was added into the emulsion at the beginning of chemical ripenning process was indicated. A significant desensitization of the emulsion occured due to the addition of the gelatin with Fe+++ dopant. But a little drop of photosensitivity of the emulsion was observed only in the case of dopping more Fe++ in the gelatin. An absorption spectrum measurement showed that some Fe++ in the gelatin are oxidized as Fe+++ in the envi-ronment of chemical ripenning of the emulsion, which seems a key factor causing the desensitization of the emul-sion containning more Fe++