5314027764
POSTER SESSION. H18
DOPPLER-FREE TWO-PHOTON SPECTRUM OF SF6 FOR METRO-LOGICAL PURPOSES
F. HERLEMONT. M. KHELKHAL and J. LEGRAND. Labo-ratoire de Physique des Lasers, Atomes et Molecules Unitę Mixte de Recherche CNRS/Unwersite de Lille 1 CERLA, Centre de Recherche en Laser et Applications Unwersite des Sciences et Technologie de Lille F-59650 Villeneuve d’Ascq, France; G. PIERRE. Laboratoire de Physiąue de rUniverstte de Bourgogne U PRESS-A 5027 Theorie des Systemes Moleculaires et des Phenomenes non Lineaires 9. Avenue Alain Savary, F-21011 Dijon- Cedez France.
We report, on the first systeinatłc investigation of the strong Doppler-free two-photon absorptions in the middle infrared. Their frequencies for two counterpropagating waves of identical frequencies have been predirted. Five of thesc transitions have been observed with sul>Doppler resolution using a sideband CO2 laser and have been measured with a 10 kHz accuracy. The knowledge of these strong two photon absorptions frequencies will allow the impnwement of secondary frequcncy standards in the infrared.
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