VLADIMIR I. MAKAROV, Institute of Chemical Kinetics and Combustion SB RAS, 630090, Novosibirsk, Russia; SERGEI A. KOCHUBEI, VALERII N. ISCHENKO, Institute of Semiconductor Physics, SB RAS, 630090, Novosibirsk, Russia.

Since the earlier work of Solarz, Batler and Levy in 1973 on NO₂ and Matsuzaki and Nagakura in 1974 on CS₂, external magnetic field effects on gaseous fluorescence have been found for a number of molecules such as SO₂, carbonyls, diazines and triazine. In the present study, we have investigated the magnetic field effects in the NO₂, SO₂, and (COF)2 (000-band fluorescence of the A¹Au<-X¹Ag transition) fluorescence and in the NO₂ and CS₂ photolysis under the time resolved experiments. It was found that in the presence of a magnetic field, the fast component induced by a magnetic field appears in the NO₂ and SO₂ fluorescence. Lifetime and amplitude of this component are dependent of a magnetic field (B). The observed data were explained by DM, in a frames of which, we assume that the \langle ²B₂ | H_z|²A₁ \rangle (= VB) and \langle ²B₁ | H_z|²A₁ \rangle (=VB) coupling are significant for NO₂, and ( \langle ¹A₂ | H_z|¹A₁ \rangle+( \langle ¹B₁ | H_z|¹A₁ \rangle (= VB = bB) coupling is significant for SO₂. Here, Hz is the Zeeman operator. It has also been found that the magnetic field reduces the yield of the NO₃ radical and S₂ molecules under the NO₂ and CS₂ photolysis. From analysis of these data it has been defined the effective reactivity of the different excited states of the studied systems. It was found that the fast component of the 00-level fluorescence decay of the A¹Au<-X¹Ag transition appears in the presence of a magnetic field. Lifetime of this component is not dependent of B, while it amplitude increases with increasing of B. Lifetime of the slow component increases in the presence of a magnetic field at P((COF)2) = 0.3 mTorr, while it decreases under other pressures. Obtained data were explained by IM, ie, magnetic field induces coupling of the hyperfine and fine sublevels of the neighbouring triplet state, which are coupled by the intramolecular interactions with the fluorescent singlet levels. Since in this case, a magnetic field influences on the efficiency of the S-T coversion, using of this method we can study the role of such energy transformation in the (COF)2 molecule photolysis.