dc.creator Herbin, Hervé en_US dc.creator Farrenq, R. en_US dc.creator Guelachvili, G. en_US dc.creator Picqué, Nathalie en_US dc.date.accessioned 2006-06-15T20:53:19Z dc.date.available 2006-06-15T20:53:19Z dc.date.issued 2004 en_US dc.identifier 2004-TA-07 en_US dc.identifier.uri http://hdl.handle.net/1811/21368 dc.description $^{a}$N. Picqu\'{e}, G. Guelachvili, High resolution multi-modulation Fourier transform spectroscopy, Applied Optics 38, 1224-1230, 1999. $^{b}$C.S. Gudeman, M.H. Begeman, J. Pfaff, and R.J. Saykally, Velocity modulated infrared laser spectroscopy of molecular ions: the $\nu_{1}$ band of $HCO^{+}$, Physical Review Letters 50, 727-731, 1983. $^{c}$X. Hong and T. A. Miller, Observation of characteristic, polarity-dependent, Doppler shifts from neutral species in the positive column of a discharge plasma, The Journal of Chemical Physics 103, 8821-8827 (1995). $^{d}$M.H. Suh, X. Hong and T.A. Miller, He metastable concentration measurements in a glow discharge, Chemical Physics 228, 145-156 (1998). en_US dc.description Author Institution: Laboratoire de Photophysique Mol\'{e}culaire, Unit\'{e} Propre du CNRS, Universit\'{e} de Paris-Sud en_US dc.description.abstract Velocity-modulation Fourier $transform^{a}$ emission spectra from an $N_{2}O/He$ discharge plasma recorded between 1 800 and $10 000 cm^{-1}$ are described. Surprisingly, they show Doppler shifted lines of the $E ^{2}\Sigma^{+}-D{^{2}}\Sigma^{+}, C{^{2}}\Pi-A {^{2}}\Sigma^{+}$ and $D {^{2}}\Sigma^{+}-A{^{2}}\Sigma^{+}$ Rydberg-Rydberg rovibronic transitions of the nitric oxide neutral molecule. $N_{2}$ transitions, with comparable intensities are also present in the spectra and remain unshifted. Mostly in laser spectroscopy, velocity $modulation^{b}$ has been since 1983 a successful technique developed for the search and characterization of molecular ions. Doppler shifts in transition frequencies of ions, which result from the drift velocities in the electric field of plasma, provide selective detection. Doppler shifted neutral species have been scarcely reported. To our knowledge the only interpretations of such observations were given for $H_{2}^{c}$ and for $He^{d}$. Both behaved like anions and the origin of their shifts was identified as deriving from momentum transfer in electron-molecule collisions. This is not the case in the present experiments where NO acts like a positively charged particle. Experimental investigations and tentative explanations of these observations are discussed. en_US dc.format.extent 479172 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title UNEXPECTED DOPPLER SHIFTS FROM A NEUTRAL MOLECULE IN AN ELECTRICAL DISCHARGE DETECTED BY VELOCITY MODULATION FTS. en_US dc.type article en_US
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