Accurate Measurement and Assignment of High Rotational Energy Levels of the 3ν3 ← ν3 Band of Methane
Résumé
We use optical-optical double-resonance spectroscopy with a high-power continuous wave pump and a cavity-enhanced comb probe to expand sub-Doppler measurements of the 3ν 3 ←ν 3 band of CH 4 to higher rotational levels. We assign the final states using combination differences, i.e., by reaching the same state using different pump/probe combinations.