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dc.contributor.authorRamos, Ángel-
dc.contributor.authorSantos, Julio-
dc.contributor.authorAbad, Laura-
dc.contributor.authorBermejo, Dionisio-
dc.contributor.authorHerrero, Víctor J.-
dc.contributor.authorTanarro, Isabel-
dc.identifier.citationJournal of Raman Spectroscopy 40(9): 1249-1256 (2009)en_US
dc.description9 pages, 7 figures.-- Printed version published Sep 2009.en_US
dc.description.abstractAn anomalous lineshape of stimulated Raman spectra obtained from the region very close to the nozzle of supersonic pulsed expansions of nitrogen is presented. High-resolution Raman spectra of the Q branch of the fundamental vibration mode of N2 have been recorded from two different nitrogen expansions at T0 = 295 K and P0 = 1.5-3.5 bar, the lasers crossing the jet axis in the range z/D = 0.25-1.25, where D is the effective nozzle diameter. The combination of Doppler shifts and strong gradients of density and temperature in the near-nozzle region yield an inhomogeneous broadening and a double peak structure of the recorded Raman line profiles. The comparison of the experimental results with the simulation of the Raman spectrum from this region provides valuable information about the near-nozzle flow field. The lineshape described here is different from another reported previously in the literature, which is based on a depletion of the density of free molecules on the axis due to condensation.en_US
dc.description.sponsorshipA. Ramos acknowledges CSIC for an I3P grant. This work has been funded by the DGI (MEC) of Spain under grants ENE 2006-14577-C04-03/FTN, FIS 2004-02558, FIS 2005-02029, and FIS 2007-61686.en_US
dc.format.extent615927 bytes-
dc.publisherJohn Wiley & Sonsen_US
dc.subjectStimulated Raman spectroscopyen_US
dc.subjectInhomogeneous broadeningen_US
dc.subjectFree jet expansionen_US
dc.subjectFlow fielden_US
dc.titleLineshape analysis of stimulated Raman spectra of the near-nozzle region of free jet expansionsen_US
dc.description.peerreviewedPeer revieweden_US
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