LEVEL EXCITATION OF IONS OF OXYGEN OVII AND FLUORINE FIX IN GASEOUS ATMOSPHERE S.P. ZHUKOV, V.V. KORUKHOV, N.G. NIKULIN, B.I. TROSHIN et A.A. CHERNENKO J. Phys. Colloques, 47 C6 (1986) C6-171-C6-175 DOI: 10.1051/jphyscol:1986624