Abstract
AbstractThe 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.
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