Abstract

Sub-Doppler resolution Stark-modulation spectra of 20 transitions in the ν3 band of methane have been recorded using a difference-frequency-generation source referenced to an optical frequency comb with a frequency uncertainty of a few kilohertz. First-order Stark shifts in the vibrational excited (v3=1) and ground states have been measured separately in the presence of an electric field up to 31 kV/cm. The observed spectra have been analyzed, taking into account the mixing of the vibration–rotation wave functions due to high-order vibration–rotation interactions. The permanent electric dipole moment constants induced by the vibration, rotation, and Coriolis-type terms in the v3=1 state, and those induced by rotation in the vibrational ground state, are determined as Pvib=16.82(7)mDebye, Prot=18.6(4)μDebye, PCor=10.4(17)μDebye, and Prot=24.47(12)μDebye.

© 2017 Optical Society of America

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