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Effect of an electric field and collisions on the laser-induced fluorescence of CS molecules

Electric field measurements are reported employing CS molecules as a sensitive probe. The molecules were produced by a rf discharge in gas. The A - X () band system of CS was optically excited by an excimer laser pumped dye laser. Spectrally resolved laser-induced fluorescence (LIF) was recorded at various strengths of a static electric field in the range of . In the theoretical part, intensities of Q- and P-components in the LIF spectrum were calculated for two limiting cases: (1) no collisional transfer of the population; (2) complete collision-induced equalization of the populations of the Zeeman sublevels. Results of the theoretical analysis of the experimental data are the following: (1) at relatively weak fields the collisional transfer dominated over the geometry-related selectivity of the pumping; (2) the weaker the electric field, the more significant was the role of the collisional transfer; (3) the higher the rotational quantum number of the laser excited state, the broader is the range of electric fields at which the collisional transfer was the predominant factor for the populations.