MEASUREMENT OF THE LOCAL ELECTRIC FIELD IN DISCHARGES USING LASER STARK SPECTROSCOPY OF THE NaK MOLECULE J. DEROUARD, H. DEBONTRIDE and N. SADEGHI J. Phys. Colloques, 48 C7 (1987) C7-725-C7-727 DOI: 10.1051/jphyscol:19877178