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The Stark effect in methane’s 3ν1+ν3 vibrational overtone band

Kirk Boraas, David F. De Boer, Zhen Lin, James P. Reilly

Abstract

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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Key concepts: Overtone, Overtone band, Stark effect, Dipole, Atomic physics, Chemistry, Molecular beam, Transition dipole moment