在KIO_3-HCl体系中,用氮分子激光作激发光源,研究了铈的价态变化。三价铈的碘酸盐能溶于酸性永溶液,而在激光辐照后,却均匀地、逐渐地生成黄色沉淀。经红外光谱及化学分析证明,此沉淀为四价铈的碘酸盐。 In KIO_3-HCl system, nitrogen laser was used as the excitation light source to study the valence state of cerium. The trivalent cerium iodate dissolves in the acidic permanent solution, but after the laser irradiation, the yellow precipitate is formed uniformly and gradually. Infrared spectroscopy and chemical analysis proved that this precipitate is tetravalent iodate of cerium.