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 and A.A. CHERNENKO J. Phys. Colloques, 47 C6 (1986) C6-171-C6-175 DOI: 10.1051/jphyscol:1986624