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Accurate Measurement and Assignment of High Rotational Energy Levels of the 3ν3 ← ν3 Band of Methane

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Abstract

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 3ν3←ν3 band of CH4 to higher rotational levels. We assign the final states using combination differences, i.e., by reaching the same state using different pump/probe combinations.

© 2023 The Author(s)

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