Measurement and assignment of E-symmetry states in the 6010-6110 cm${}^{-1}$ and 8940-9150 cm${}^{-1}$ ranges of methane using optical frequency comb double-resonance spectroscopy

Adrian Hjältén, Vinicius Silva de Oliveira, Michael Rey +3

We use sub-Doppler optical-optical double-resonance (OODR) spectroscopy with a 3.3 $\mu$m single-frequency pump and a cavity-enhanced 1.65 $\mu$m comb probe to measure 33 ladder-type (…