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6051709 
Journal Article 
Intensity of a crossover signal relative to Lamb dips observed in Stark spectroscopy of methane 
Okuda, S; Sasada, H 
2018 
Yes 
Journal of Molecular Spectroscopy
ISSN: 0022-2852
EISSN: 1096-083X 
Elsevier 
352 
Elsevier 
10-15 
WOS:000444783100002 
We have observed twelve triplets of two Lamb dips and a crossover signal in Stark spectroscopy of the ν3 band of methane using a comb-referenced sub-Doppler resolution spectrometer. The crossover signal consists of two crossover resonances in the Λ- and V-type three-level systems, which overlap each other in frequency under the first-order Stark shifts (Tyurikov et al., 1997). The intensity of the crossover signal relative to the Lamb dips agrees well with a simple calculation based on steady-state solutions of rate equations in weak saturation using the observed intensity ratio of the Lamb dips in the Λ-type three-level system. 
Saturated absorption spectroscopy; Comb spectroscopy; Mid infrared; Crossover resonance; Methane; First-order Stark shift