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Molecular spectroscopy in the infrared region is pushed to new limits by using the Ramsey technique of separated fields on a two-photon transition in SF₆ excited using a CO₂ laser. The geometry employed elegantly compensates all Doppler problems, while giving progressively higher resolution for simple optical adjustments. In addition, the molecular beam can be characterized by interrogation of a quasiresonant intermediate level. Fringes are obtained with a periodicity down to 1.5 kHz and a statistical uncertainty of a few 10^-13Hz^-1/2. The projection for a frequency standard is in the 10^-15 range.
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Amy‐Klein et al. (2000) studied this question.
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