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4 papers

physics.chem-ph2026

Measurement and assignment of 10 rotational energy levels in the 9510 to 9810 cm and 6590 to 6900 cm ranges of methane using optical frequency comb double-resonance spectroscopy

Yuan Cao, Adrian Hjältén, Vinicius Silva de Oliveira +4

The paper reports measurements and assignments of methane rotational transitions with J ≥ 10 using optical‑optical double‑resonance spectroscopy combined with a cavity‑enhanced fre…

physics.chem-ph2025

Measurement and assignment of E-symmetry states in the 6010-6110 cm and 8940-9150 cm 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 m single-frequency pump and a cavity-enhanced 1.65 m comb probe to measure 33 ladder-type…

physics.optics2025

Combined frequency comb and continuous wave cavity-enhanced optical-optical double-resonance spectrometer in the 1.7 m range

Vinicius Silva de Oliveira, Adrian Hjältén, Isak Silander +4

We present an optical-optical double-resonance (OODR) spectrometer based on a 3.3 m continuous wave pump and two cavity-enhanced probes: a frequency comb tunable in the 1.64 -…

physics.chem-ph2025

Assignment of collision-induced four-level double-resonance transitions in the 3 spectral region of methane

Kevin K. Lehmann, Isak Silander, Adrian Hjältén +2

Optical-optical double-resonance (OODR) spectroscopy using a narrow-linewidth pump and a frequency comb probe has previously been used to measure and assign sub-Doppler transitions…