Intensities of the absorption bands of halide ions in solution

The nature of the charge distribution in the excited state of halide ions in solution was investigated by calculation of the oscillator strengths of their u.-v. absorption bands. Two alternative pictures were adopted for the description of the excited state: the electron-in-a-box model, ² the hydrogen-like model,¹ and the np⁵(n+1)s state stabilized by solvation.³ Fair agreement is obtained by application of the continuous model. Environmental effects on the oscillator strengths are considered. The limitations of the continuous model are discussed.