Gas spectroscopy and temperature measurement by coherent Raman anti-stokes scattering

Moya, Francisca; Druet, S.A.J.; Taran, J. P.

doi:10.1016/0030-4018(75)90034-6

Cited by 130 publications

(14 citation statements)

References 16 publications

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“…Wn'n = oeba (2) for the situation where excitation is done using two pump frequencieswl and C02. Note that the use of three separately tunable sources would enable one to achieve triple resonance conditions without restrictions on any available molecular transition; these possibilities as well as other aspects of resonance CARS spectroscopy are developed in [14].…”

Section: Analysis Of Lower Level 1 A~ Contribu-mentioning

confidence: 99%

“…For the specific case of a fundamental vibrational transition we have Av = 1; in addition, the one-photon selection rules AJ = ± 1 and AQ = 0 must be respected [24]. The systematic search for neartriple resonances using equation (2) then gives the lines : and which are found in the spectrum at the positions : and respectively for three sets of quantum numbers and term indices i : 2.2 ANALYSIS OF UPPER ROVIBRATIONAL LEVEL |b C ONTRIBUTIONS. -The preceding discussion has been devoted to spectral contributions from the ground vibrational level population paa.…”

Section: Analysis Of Lower Level 1 A~ Contribu-mentioning

confidence: 99%

“…Scattering (CARS) is an attractive technique for combustion diagnostics [1][2][3][4][5]. Its detectivity, however, is limited by the existence of a non-vibrationally resonant background of electronic nature which can preclude the detection of trace species, i.e.…”

Section: Introduction -Coherent Anti-stokes Ramanmentioning

confidence: 99%

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Resonance-enhanced coherent anti-Stokes Raman scattering in C2

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Müller‐Dethlefs

et al. 1983

Rev. Phys. Appl. (Paris)

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2014 Des spectres de Diffusion Raman Anti-Stokes Cohérente (DRASC) à la résonance électronique ont été obtenus sur le radical C2 formé dans une décharge microonde et dans une flamme de chalumeau oxy-acétylénique. La résonance électronique a été obtenue en accordant les lasers dans le système de Swan. Des spectres d'émission de C2 sur la bande de Swan avaient au préalable été enregistrés par spectroscopie à transformée de Fourier et interprétés; ceci a permis de déterminer les conditions optimales d'enregistrement des spectres DRASC, puis d'interpréter ces derniers sans ambiguïté. Des simulations numériques ont été calculées; ces simulations prennent en compte l'effet des populations des états vibrationnels supérieurs et de l'élargissement Doppler; elles sont en bon accord avec les spectres expérimentaux. Les densités de C2 observées sont voisines de 5 x 1011 cm-3 dans la décharge et 1013 cm-3 dans la flamme. Le seuil de détection est 1010 cm-3 avec notre instrument. Abstract 2014 We have obtained resonance-enhanced Coherent Anti-Stokes Raman Scattering (CARS) spectra of the C2 radical formed in a microwave discharge and in an acetylene welding torch. Electronic resonance enhancement was obtained in the Swan system. In order to prepare this work, Swan band emission spectra of C2 had been recorded and assigned using Fourier-transform spectroscopy; this enabled us to determine the optimal conditions for the CARS spectroscopy and to assign the CARS spectra unambiguously. Numerical simulations were performed, with due account for the effects of upper vibrational state populations and for Doppler broadening; the agreement with experimental spectra is fair. We deduce from the spectra C2 densities of about 5 x 1011 cm-3 in the discharge and 1013 cm-3 in the flame. The detection sensitivity is of the order of 1010 cm-3 for our system.

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Section: Analysis Of Lower Level 1 A~ Contribu-mentioning

confidence: 99%

Section: Analysis Of Lower Level 1 A~ Contribu-mentioning

confidence: 99%

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Resonance-enhanced coherent anti-Stokes Raman scattering in C2

Attal

Débarre

Müller‐Dethlefs

et al. 1983

Rev. Phys. Appl. (Paris)

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“…11 Furthermore the CARS technique, adapted and used for temperature and concentration measurements since the 1970s (Refs. [12][13][14], was already successfully applied under the harsh conditionsat ramjet facilities. 15 -19 The applicationof CARS was reviewed in several publications;e.g., see Ref.…”

Section: Introductionmentioning

confidence: 98%

Coherent Anti-Stokes Raman Scattering Temperature Measurements on an Air-Breathing Ramjet Model

et al. 1999

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Coherent anti-Stokes Raman scattering was used to measure nitrogen single-pulse spectra at the entrance and exit area of a thrust nozzle. Thermodynamic nonequilibrium effects were proved at the exit of the hypersonic nozzle, belonging to an air-breathing, hydrogen-combustingramjet model. To determine the accurracy of extracted rotational and vibrationaltemperatures, additional laboratory experiments were performed. The nozzle expansion was characterized by wall pressure measurements.

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“…In contrast, the spectral resolution in CARS is determined by the spectral bandwidth of the lasers. It was therefore natural to use CARS for high-resolution gas-phase Raman spectroscopy and to probe the chemical composition and the temperature distribution within flames (Regnier and Taran, 1973;Regnier et al, 1974;Moya et a/., 1975) (Levenson and Bloembergen, 1974a,b;Hochstrasser et al, 1980). This calibration is in turn used to evaluate the two-photon tensor Tad of individual vibronic lines.…”

Section: Raman and Two-photon Resonances In Four-wave Mixingmentioning

confidence: 99%