Absorption Spectra of Terbium Perchlorate and Terbium Chloride Solutions

Abstract

The spectra of terbium perchlorate and terbium chloride solutions have been recorded in the range of 200 to 1200 m mu with the Cary recording spectrophotometer. An intense absorption at 219.8 m mu follows Reer's law and is usable for accurate determination of terbium at low concentrations. The molar extinction coefficient for perchlorate solutions was calculated to be 320. There are a number of minor absorptions in the range of 240 to 380 m mu , and a minor absorption at 487 m mu , but no significant absorptions at other wave lengths up to 1200 m mu . Beer's law is followed for most of the absorptions; notable exceptions are the absorptions at 263 m mu and at 265 m mu . (auth)