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dc.creatorHerbin, Hervéen_US
dc.creatorFarrenq, R.en_US
dc.creatorGuelachvili, G.en_US
dc.creatorPicqué, Nathalieen_US
dc.date.accessioned2006-06-15T20:53:19Z
dc.date.available2006-06-15T20:53:19Z
dc.date.issued2004en_US
dc.identifier2004-TA-07en_US
dc.identifier.urihttp://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.descriptionAuthor Institution: Laboratoire de Photophysique Mol\'{e}culaire, Unit\'{e} Propre du CNRS, Universit\'{e} de Paris-Suden_US
dc.description.abstractVelocity-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.extent479172 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleUNEXPECTED DOPPLER SHIFTS FROM A NEUTRAL MOLECULE IN AN ELECTRICAL DISCHARGE DETECTED BY VELOCITY MODULATION FTS.en_US
dc.typearticleen_US


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