A kinetic model is presented for decay of an SF, arc plasma, concerning the period when the electrons disappear (the so-called post-arc phase in SF, circuit breaker operation). The model is based on solution of the rate equations of the 1 4 species chosen for the study (electrons, atomic ions, atoms, and diatomic molecules and ions). It is applied to a homogeneous medium at constant pressure in which the variation of temperature is taken as being known. The most interesting results concern electron decay and show the possibility of electron overpopulation with respect to the equilibrium composition. The departures from equilibrium remain slight and are analysed by comparing the variation rate constant of electrons with the relaxation times of the main electron dissipation reactions. namely electron-ion recombination and dissociative attachment..Pressure has a strong influence on departures from equilibrium, which decreases as the pressure rises.

Direct observation of the (2) 3Π u state of Cs2 by resonance enhanced two photon ionization spectroscopy in a very cold molecular beam J. Chem. Phys. 99, 5677 (1993); 10.1063/1.465936 Dopplerfree high resolution laser spectroscopy of the Cs2 D 1Σ+ u state and the predissociation J. Chem. Phys. 94, 2600 (1991); 10.1063/1.460690SubDoppler laser spectroscopy of SO2 in a supersonic beam

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The Zeeman splitting of rotational lines in the V system of CS2 were systematically studied, using a cw single mode frequency doubled dye laser with linear and circular polarization in a cold collimated molecular beam within a tunable magnetic field up to 0.2 Tesla. Two sources of magnetic moments of levels in the excited 1B2 state could be identified. First, a second order spin‐orbit spin‐rotational coupling to the spin components of the 3A2(3Δu) electronic state is responsible for the generated magnetic moments in the rotational levels of the 1B2 state, which seem to be irregularly behaved. Because of the insufficient information about the spin components of the triplet state 3A2(3Δu) we developed a model of two interacting levels, which can explain many of the observed patterns of the rotational levels in a magnetic field. Secondly, an electronic Coriolis coupling (Renner‐Teller coupling) betwen the two Born‐Oppenheimer component states 1A2(1Δu) and 1B2(1Δu) leads to a partly quenched electronic orbital angular momentum. Consequently, the Landé gJ factors posses a {J(J+1)}−1 dependence. This has been observed for the π bands of the 1B2(1Δu) state. Moreover, the analysis of the measured Zeeman patterns yields valuable information about the coupling parameters.