VARIATION OF F-CENTER CONCENTRATION IN DILUTE K-KCL SOLUTION : COMPARISON OF AN OPTICAL STUDY WITH THERMODYNAMIC PREDICTION Th. RAUCH, D. NATTLAND et W. FREYLANDJ. Phys. IV France, 01 C5 (1991) C5-147-C5-153DOI: https://doi.org/10.1051/jp4:1991518