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  • 11
    Electronic Resource
    Electronic Resource
    Rotational and vibrational energy transfer of H"2(ν = 1, J = 1) in collisions with H"2, Ar, HD and D"2
    Amsterdam : Elsevier
    Chemical Physics 133 (1989), S. 123-136 
    Details
    ISSN: 0301-0104
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0301-0104(89)80105-3
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  • 12
    Electronic Resource
    Electronic Resource
    Determination of temperature and concentration of molecular nitrogen, oxygen and methane with coherent anti-stokes raman scattering (1988)
    Springer
    Applied physics 45 (1988), S. 183-190 
    Details
    ISSN: 1432-0649
    Keywords: 33.20 ; 37.70 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Temperature and concentration measurements by Coherent Anti-Stokes Raman Scattering (CARS) of molecular nitrogen, oxygen and methane were carried out. A comparison of corrected thermocouple and CARS temperature measurements in a high-temperature furnace up to 2000 K is presented. The temperature dependent CARS spectra of N2 and O2 are evaluated by a simulation program. Agreement between CARS and thermocouple temperatures is obtained within 40 K for N2 and 80 K for O2. Good agreement is found between measurements and calculations of the decrease of CARS intensity with temperature. Various “quick-fit” methods for N2-and O2-temperature measurements from temperature sensitive spectral parameters were tested. Temperature dependent CARS spectra of thev 1-fundamental of methane are recorded and the methane CARS intensity as function of temperature is measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695289
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  • 13
    Electronic Resource
    Electronic Resource
    Detection of free NH2(X 2 B 1) radicals by CARS spectroscopy (1984)
    Springer
    Applied physics 33 (1984), S. 213-218 
    Details
    ISSN: 1432-0649
    Keywords: 35 ; 82.40 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract CARS spectra of NH3 and the free NH2-radical in the NH stretch region at 3334 and 3220 cm−1 have been obtained, respectively. The NH2 radicals were generated by laser photolysis of 0.5 mbar NH3 at 193 nm with an ArF-exciplex laser and detected by time resolved CARS spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697330
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  • 14
    Electronic Resource
    Electronic Resource
    High temperature O2-CARS thermometry (1992)
    Springer
    Applied physics 55 (1992), S. 388-390 
    Details
    ISSN: 1432-0649
    Keywords: 33.00 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract O2 temperature measurements at T=1910K have been performed by coherent anti-Stokes Raman scattering (CARS) inside a homogeneously heated gas volume of a tube furnace. The oxygen CARS spectrum can now be modeled accurately within the higher vibrational levels of the Q-branch manifold populated at flame temperatures using recently available spectroscopic data and collisional broadening coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333087
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  • 15
    Electronic Resource
    Electronic Resource
    The application of a raman-shifted tunable KrF excimer laser for laser-induced fluorescence combustion diagnostics (1992)
    Springer
    Applied physics 55 (1992), S. 381-387 
    Details
    ISSN: 1432-0649
    Keywords: 33.00 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Four wavelength extensions have been investigated by stimulated Raman scattering in hydrogen or deuterium gas of the 248 nm fundamental output of a narrow-band tunable KrF excimer laser. They have been used to acquire laser-induced fluorescence spectra of NO and OH in flames at atmospheric pressure. NO is detected in relatively high rotational states within the γ-band electronic system at 225 nm. OH was excited at 291.5 nm in the (1–0), at 313 nm in the (1–1) and at 268.5 nm in the predissociative (3–1) band of the 2Σ–2Π electronic band system, respectively. Prospects of 2D imaging for concentration and temperature measurements in flames using these wavelength extensions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333086
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  • 16
    Electronic Resource
    Electronic Resource
    Mid-infrared laser-induced grating experiments of C2H4 and NH3 from 0.1–2 MPa and 300–800 K (2000)
    Springer
    Applied physics 71 (2000), S. 673-680 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.62.Fi; 43.35.Ae; 51.20.+d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Laser-induced thermal gratings (LITG) were generated in mixtures of ethylene and ammonia in nitrogen using mid-infrared laser radiation from a grating-tuned, low-pressure, pulsed (5 ms pulse width) CO2 laser, and read out with a continuous wave Nd:YLF laser. The LITG signal intensity was measured as a function of pressure (0.1–2 MPa) and temperature (300–800 K, at 0.1 and 1 MPa) by tuning the laser to the accidental coincidences of the 10P(14) and 10R(6) emission lines with molecular absorption transitions of C2H4 and NH3, respectively. Comparisons are made with theoretical predictions for the grating efficiency from a simple thermalization model. A theoretical comparison of the temporal LITG signal response for three excitation pulse shapes – a delta function, a realistic pulse, and a square wave is presented. Furthermore, it is shown that for NH3, most of the decrease of the LITG signal intensity with increasing temperature is due to the corresponding decrease in fractional molecular absorption of the pump beam radiation. The diagnostic capabilities of the mid-infrared LITG experiment is demonstrated for spatially resolved ethylene measurements with long laser pulses in a premixed stoichiometric CH4–air flame at atmospheric pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000408
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  • 17
    Electronic Resource
    Electronic Resource
    CARS studies of vibrationally excited nitrogen at low pressures (1982)
    Springer
    Applied physics 29 (1982), S. 31-36 
    Details
    ISSN: 1432-0649
    Keywords: 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Coherent anti-Stokes Raman spectroscopy (CARS) was used to measure the vibrational temperature of microwave-excited nitrogen in a N2−CO−He mixture. CARS spectra, originating from the N2-vibrational levelsv=0 up tov=3, have been recorded by both narrowband scanning of the resonance region as well as by broadband OSA detection. For the microwave-excited N2 molecules a vibrational temperatureT v (N 2 = (2130±110K) and a lower limit of detection forN 2(v = 3) = 1.2 x 1015 cm−3 was established. The CARS results were independently confirmed by simultaneously recorded and spectrally resolved CO infrared fluorescence studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694366
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  • 18
    Electronic Resource
    Electronic Resource
    Multiplex polarization spectroscopy of OH for flame thermometry (1997)
    Springer
    Applied physics 65 (1997), S. 633-637 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.33.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 2 Σ-X2Π(0,0) band system. High resolution polarization spectra were also recorded in the same flame using a conventional, frequency scanned, narrow linewidth dye laser. Absorption effects were found to produce significant systematic errors in the temperatures derived from the unsaturated spectra produced by both multiplex and narrow linewidth scanning techniques. After correction for absorption effects, temperatures were derived from the single-shot multiplex spectra with a precision of 4% which agreed well with values obtained from scanned spectra and from the calculated adiabatic temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050325
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  • 19
    Electronic Resource
    Electronic Resource
    Parameter studies in practical nitrogen CARS thermometry using standard and advanced fitting codes (1990)
    Springer
    Applied physics 50 (1990), S. 39-46 
    Details
    ISSN: 1432-0649
    Keywords: 33.10.Jz ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A systematic study of the influence of the collisional narrowing and the cross coherence effect on the temperature analysis of N2-Q branch-CARS spectra at atmospheric pressure is presented. A comparison of calculated spectra over a temperature range 300–2000 K reveals that the standard theory neglecting these effects leads to temperature errors of +1.7% under flame conditions, when the nonresonant background is suppressed. This result is supported by the analysis of experimental CARS temperature measurements on a standard laminar diffusion flame. Furthermore, the temperature misreadings originating from erroneous slit function parameters and laser linewidth were investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330091
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  • 20
    Electronic Resource
    Electronic Resource
    Polarization-spectroscopic measurement and spectral simulation of OH (A 2 Σ−X 2 Π) and NH (A 3 Π−X 3 Σ) transitions in atmospheric pressure flames (1995)
    Springer
    Applied physics 61 (1995), S. 421-427 
    Details
    ISSN: 1432-0649
    Keywords: 33.00 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Polarization spectroscopy has been used to investigate the electronic bands of OH (A 2 Σ-X 2 Π) and NH (A 3 Π-X 3 Σ) radicals generated in atmospheric pressure flames. The pump-beam intensity dependence of the polarization-spectroscopy signals of isolated lines in theR branches has been studied. It was found that significant saturation is noticeable for pump-beam intensities as low as 0.1 MW/cm2. A detailed theoretical description inluding laser-bandwidth convolutions has been developed to model unsaturated polarization spectra of OH and NH. For OH, temperature evaluations have been performed in methane/air flames from fits to experimentalR 1 band head spectral structures. The results are critically dependent on the degree of saturation in experimental spectra, instrumental bandwidth and the assumed coupling cases in the calculation of line-strength parameters. It is shown that saturation leads to an error of more than 60% in the temperature evaluation when a pump-beam intensity of 1 MW/cm2 is used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081270
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