Methane’s 3ν1+ν3 vibrational overtone transition centered at 8871 Å is studied with a molecular beam/Stark apparatus having 7.5 MHz Doppler limited resolution. First-order Stark splitting is observed for transitions between levels of E-type symmetry. From the measured splittings, we estimate the magnitude of the vibrationally induced dipole moment of the 3ν1+ν3 vibrational state.
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Boraas et al. (1993) studied this question.
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