# LASER STARK SPECTROSCOPE OF 1,1-DIFLUOROETHYLENE $(CH_{2}=CF_{2})$ AT 890 GHz

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 dc.creator Chou, Hans en_US dc.creator Davis, L. W. en_US dc.creator Johnston, L. H. en_US dc.creator Peck, E. R. en_US dc.date.accessioned 2006-06-15T14:03:34Z dc.date.available 2006-06-15T14:03:34Z dc.date.issued 1978 en_US dc.identifier 1978-RA-01 en_US dc.identifier.uri http://hdl.handle.net/1811/10451 dc.description $^{1}$G. Duxbury and R. G. Jones, Mol. Physics 20, 271 (1971) $^{2}$J. C. Chaffoureaux, Bull. Cl. Sci. Acad, Roy. Belg. 51, 47 (1965). $^{3}$O. I. Baskokov, et al., Journal of Applied Spectroscopy 24, 1083 (1976) (Russian)."" en_US dc.description Author Institution: Department of Physics, University of Idaho en_US dc.description.abstract The 890.761 GHz line of the HCN laser has been used to produce a Stark spectrum In $CH_{2}=CF_{2}$, of natural isotopic composition. The rotational fine structure is well resolved, for both $\Delta M=0$ and $\Delta M=1$ polarizations. The spectrum starts at 1600 V/cm for $\Delta M=1$, and at slightly lower fields for $\Delta M=0$. This resonance was first reported by Duxbury and Jones $^{1}$ who were able to see Stark dependent absorption but could not resolve enough structure to assign the transition. We have established that $\Delta J=1$ by the intensity pattern of M components; that the transition frequency lies several hundred MHz below the laser frequency, by slightly detuning the laser; that the first order Stark effect predominates that $\Delta M= +1$ holds (absorption) for the $\bot$ polarization spectra; and that $\Delta J$ probably is $48 \leftarrow 47$, by counting Stark components. Here the uncertainty is that extrapolation is required, since the $\Delta M=0$ spectra start out with very low intensity. We hope to be able to make a complete assignment, by calculating energy levels and Stark coefficients for various J and $K_{a},\; K_{c}$ assignments. Lines for a second transition start at about 5500 V/cm, in both polarizations. This transition is also for a high J value, $J>40$, and $\Delta J=1$. This transition lies above the laser frequency. References for rotational and distortion constants for $CH_{2}=CF_{2}$ are given $below^{2,3}$ en_US dc.format.extent 176192 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title LASER STARK SPECTROSCOPE OF 1,1-DIFLUOROETHYLENE $(CH_{2}=CF_{2})$ AT 890 GHz en_US dc.type article en_US