Abstract
Excitation spectra and the change with an external magnetic field of the 9U band, which is assigned as the RB2(0,12,0)←X 1Σg+(0,0,0) transition of carbon disulfide (CS2), are measured with sub-Doppler resolution. Zeeman splittings into 2J+1 lines are observed both in the P(J+1) and R(J−1) lines, and the Zeeman splittings are attributed to the ones of the excited levels. The spacings between adjacent M levels are observed to be larger in low energy components than in high energy components. From the analysis, it is shown that the B2 level of the 3A2(3Δu) state lies about 48 cm−1 lower than the A1 and B1 levels and that the +M components lie in a higher energy region than the −M components. The M=0 component is observed to shift to lower energy as the magnetic field increases. This is shown to be originating from the Zeeman interaction with selection rules ΔJ=±1 in addition to the one of ΔJ=0.
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