dc.creator Johns, J. W. C. en_US dc.creator McKellar, A. R. W. en_US dc.creator Oka, T. en_US dc.creator Romheld, M. en_US dc.creator Trombetti, A. en_US dc.date.accessioned 2006-06-15T17:17:00Z dc.date.available 2006-06-15T17:17:00Z dc.date.issued 1974 en_US dc.identifier 1974-WE-4 en_US dc.identifier.uri http://hdl.handle.net/1811/16511 dc.description $^{1}$T. W. H\""ansch, I. S. Shahin, and A. L. Schawlow, Phys. Rev. Letters 27, 707 (1971). $^{2}$S. M. Freund, J.W.C. Johns, A.R.W. McKellar, and T. Oka, J. Chem. Phys. 59, 3445 (1973). en_US dc.description Author Institution: Division of Physics, National Research Council of Canada en_US dc.description.abstract While observing laser Stark Lamb dips for vibration-rotation transitions which are nearly coincident with infrared laser lines, we have observed extra dips midway between the dips associated with successive M components. These extra dips have been observed for a transition in the $2\nu_{2}$ overtone band of $NH_{3}$ In the 5$\mu$ region using a CO laser and for five transitions in the $\nu_{3}$ fundamental bands of $CH_{3}F$ and $^{13}CH_{3}F$ in the 10$\mu$ region using a $CO_{2}$ laser. They are similar to those observed by H\”ansch, Shahin and $Schawlow^{1}$ in that they appear midway between normal Lamb dips and that they are due to molecules with a non zero velocity component along the direction of the laser beam. However, in our experiments, the Stark shifted energy levels constitute a four level system and the saturating transition does not affect the other transition directly. We believe that the extra dips observed in such a system are caused by efficient collision induced transitions between different M components, without change of $velocity.^{2}$ en_US dc.format.extent 484458 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title OBSERVATION OF COLLISION-INDUCED CENTER DIPS IN LAMB DIP STARK SPECTROSCOPY en_US dc.type article en_US
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