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  • 42.65  (5)
  • Fluorescence  (2)
  • 1
    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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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    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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    Paper (German National Licenses)
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  • 4
    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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    Paper (German National Licenses)
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  • 5
    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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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    New fluorescent labels for time-resolved detection of biomolecules (1993)
    Springer
    Journal of fluorescence 3 (1993), S. 131-139 
    Details
    ISSN: 1573-4994
    Keywords: Fluorescence ; multiplex dyes ; photochemistry ; time-resolved spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New dyes with characteristic fluorescence lifetimes have been developed for bioanalytical applications. Based upon the concept of “multiplex dyes,” we have designed rhodamine dyes with nearly identical absorption and emission spectral characteristics but different fluorescence lifetimes. Extending this principle to applications with laser diodes, new rhodamines with functional groups for covalent coupling of analytes have been developed. The new labels exhibit absortion and fluorescence beyond 600 nm and have a high quantum efficiency, even in aqueous buffer systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00862730
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    New fluorescent dyes in the red region for biodiagnostics (1995)
    Springer
    Journal of fluorescence 5 (1995), S. 247-261 
    Details
    ISSN: 1573-4994
    Keywords: Fluorescence ; photochemistry ; rhodamine dyes ; time-resolved spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The increased sensitivity together with the advent of low-cost optical sources and detectors in the visible-near IR region has led us to current efforts to develop new efficient fluorescent labels for biodiagnostics with absorption and emission beyond 600 nm. In view of the general fluorescence decrease with increasing emission wavelength, we investigated the possibility to shift the absorption of rhodamine dyes toward the region 620–670 nm. The hydrophobic nature of all known long-wavelength dyes results in the tendency to form intra- and intermolecular aggregates in hydrophilic solvents, especially in aqueous environment. Due to the aggregation with biological materials, fluorescence quenching of the dyes is often observed. New strategies for prevention of these processes are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00723896
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    Paper (German National Licenses)
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