Measurement and assignment of J = 5 to 9 rotational energy levels in the 9070-9370 cm${}^{-1}$ range of methane using optical frequency comb double-resonance spectroscopy

Adrian Hjältén, Vinicius Silva de Oliveira, Isak Silander +6

We use optical-optical double-resonance (OODR) spectroscopy with a continuous wave (CW) pump and a cavity-enhanced frequency comb probe to measure high rotational energy levels of…