The pure rotational Raman spectrum of CS 2 in the ground and 01 10 vibrational states

The pure rotational Raman spectra of CS ₂ in the 00 ⁰0 and 01 ¹0 vibrational states have been observed using a low power HeNe laser (λ = 6328 Å) and a high resolution plane grating spectrograph. The ∆ J = 2 transitions with J = odd in the 01 ¹0 state are clearly resolved from the ground state transitions thus allowing the determination of some upper state rotational constants. The molecular constants determined in this work are for the 00 ⁰0 ground state, B_{00 ⁰0} = 0.10912 ± 0.7 × 10 ^-5 cm ^-1, ( D_J) _{00 ⁰0} = (0.83 ± 0.18) × 10 ^-8 cm ^-1 and for the 01 ¹0 excited state B_{01 ¹0} ^c = 0.10935 ± 0.00002 cm ^-1 and ( D_J) _{01 ¹0} ^c = (1.5 ± 0.6) × 10 ^-8 cm ^-1.