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Communication Dans Un Congrès Année : 2023

Measurement and Assignment of Hot-Band Methane Transitions Using Cavity-Enhanced Comb-Based Double-Resonance Spectroscopy

Résumé

Accurate assignments of highly-excited molecular vibrational states are needed for the verification of theoretical predictions of high-temperature spectra observed in astrophysics and combustion environments. We previously demonstrated that optical-optical double resonance spectroscopy with a continuous wave (CW) pump and a frequency comb probe is a powerful tool for this purpose; it allows simultaneous measurement of multiple hot-band transitions from a selectively populated state with sub-Doppler resolution [1]. Using a 3.3 μm CW laser as a pump and a 1.67 μm comb as a probe, we detected previously unobserved transitions in the 3ν3 ← ν3 range of methane [2]. The sample was contained in a single-pass cell, and the comb probe spectra were measured using a Fourier transform spectrometer with comb-mode-limited resolution. Recently, we implemented an enhancement cavity for the comb probe that improved the absorption sensitivity by more than two orders of magnitude [3]. Here we use this cavity-enhanced system to measure 3ν3 ← ν3 methane transitions with much improved frequency and relative intensity accuracy, which allows unambiguous assignments of the final states using two independent methods.
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Dates et versions

hal-04246933 , version 1 (17-10-2023)

Identifiants

  • HAL Id : hal-04246933 , version 1

Citer

Vinicius Silva de Oliveira, Isak Silander, Adrian Hjältén, Andrea Rosina, Lucile Rutkowski, et al.. Measurement and Assignment of Hot-Band Methane Transitions Using Cavity-Enhanced Comb-Based Double-Resonance Spectroscopy. Conference on Lasers and Electro-Optics/Europe and European Quantum Electronics Conference, Jun 2023, Munich, Germany. paper ed_4_1. ⟨hal-04246933⟩
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