Sub-Doppler optical-optical double-resonance spectroscopy using a cavity-enhanced frequency comb probe.

ABSTRACT: Accurate parameters of molecular hot-band transitions, i.e., those starting from vibrationally excited levels, are needed to accurately model high-temperature spectra in astrophysics and combustion, yet laboratory spectra measured at high temperatures are often unresolved and difficult to assign. Optical-optical double-resonance (OODR) spectroscopy allows the measurement and assignment of individual hot-band transitions from selectively pumped energy levels without the need to heat the sample. However, previous demonstrations lacked either sufficient resolution, spectral coverage, absorption sensitivity, or frequency accuracy. Here we demonstrate OODR spectroscopy using a cavity-enhanced frequency comb probe that combines all these advantages. We detect and assign sub-Doppler transitions i

SUBMITTER: Silva de Oliveira V 

PROVIDER: S-EPMC10762249 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature