54 research outputs found

    Analyse der zeitlichen und örtlichen Struktur turbulenter Verbrennungsprozesse mit Hilfe laserspektroskopischer Verfahren

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    Brockhinke A. Analyse der zeitlichen und örtlichen Struktur turbulenter Verbrennungsprozesse mit Hilfe laserspektroskopischer Verfahren. Göttingen: Cuvillier; 1996

    Investigation Of Excited-State Relaxation In Single-Tryptophan-And Other Proteins Via Multidimensional Static And Time-Resolved Fluorescence

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    Schwedler S, Kohse-Höinghaus K, Brockhinke R, Brockhinke A. Investigation Of Excited-State Relaxation In Single-Tryptophan-And Other Proteins Via Multidimensional Static And Time-Resolved Fluorescence. In: Biophysical Journal. Vol 96. Elsevier BV; 2009

    Energy transfer in combustion diagnostics: Experiment and modeling

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    Brockhinke A, Kohse-Höinghaus K. Energy transfer in combustion diagnostics: Experiment and modeling. FARADAY DISCUSSIONS. 2001;119(1):275-286.Laser induced fluorescence (LIF) of OH (A (2)Sigma (+)) is measured in several atmospheric-pressure flames using a short-pulse laser system (80 ps duration) in conjunction with an intensified streak camera. The two-dimensional signal-detection technique allows one to simultaneously monitor rotational and vibrational relaxation as well as electronic quenching. Rotationally-resolved LIF spectra affected by energy transfer are compared with the results of a rate-equation model and are found to be in reasonably good agreement. It is shown that a significant contribution of fluorescence detected by broad-band techniques is due to levels populated by vibrational energy transfer (VET). Implications for picosecond LIF techniques for the time-resolved, quench-free detection of OH are discussed. A detailed analysis is presented for fluorescence spectra originating from levels populated by VET after excitation of states in the OH (A (2)Sigma (+), v' = 2) level

    Selected papers about chemiluminescence of flames

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    Brockhinke A, Schulz C. Selected papers about chemiluminescence of flames. Applied Physics B. 2012;107(3):513-514

    Zuschauen bei der chemischen Reaktion: Detektivarbeit mit Lasern und Massenspektrometern

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    Kohse-Höinghaus K, Brockhinke A. Zuschauen bei der chemischen Reaktion: Detektivarbeit mit Lasern und Massenspektrometern. Nordrhein-Westfälische Akademie der Wissenschaften und der Künste, Vorträge. N, Naturwissenschaften und Medizin. Vol 474. Paderborn: Ferdinand Schöningh; 2009

    Rotationally resolved single-photon ionization of HCl and DCl

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    Drescher M, Brockhinke A, Böwering N, Heinzmann U, Lefebvre-Brion H. Rotationally resolved single-photon ionization of HCl and DCl. Journal of Chemical Physics. 1993;99(4):2300-2306

    Solvatochromism and fluoride sensing of thienyl-containing benzodiazaboroles

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    Schwedler S, Eickhoff D, Brockhinke R, Cherian D, Weber L, Brockhinke A. Solvatochromism and fluoride sensing of thienyl-containing benzodiazaboroles. Physical Chemistry Chemical Physics. 2011;13(20):9301-9310.Static and time-resolved fluorescence studies were carried out to investigate the photophysical properties and fluoride sensing abilities of highly fluorescent thienyl-containing 1,3-diethyl-1,3,2-benzodiazaboroles. Absorption and fluorescence spectra were measured in various solvents, showing the fluorophores to emit in the visible wavelength region with colors varying from blue to orange and quantum yields ranging between 0.21 and 1. Measured Stokes shifts of 2898 cm(-1) to 9308 cm(-1) were used to calculate the difference between excited-and ground-state dipole moments of the fluorophores. Values up to 18.8 D are of the same magnitude as for designed polarity probes such as PRODAN, supporting the idea of internal charge transfer transitions. Quenching studies with pyridine observing static and time-resolved fluorescence revealed a purely dynamic quenching mechanism and low Lewis acidity of the boron within the benzodiazaborolyl moiety compared to other triarylboranes. In contrast to this, quenching with fluoride was shown to stem from adduct formation. Reversible complexation of fluoride follows a simple mechanism for multi-functionalized benzodiazaboroles 2b and 2c, while those containing only one benzodiazaborole moiety (1 and 2a) show a more complicated behaviour, which might be explained by aggregation. Combining a benzodiazaborole group and a dimesitylborane function results in spectrally switchable fluoride sensors 3a and 3b, since the two boron sides can be deactivated for fluorescence in a stepwise manner

    Zuschauen bei der chemischen Reaktion? Laserdiagnostik mit kurzen Lichtpulsen

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    Kohse-Höinghaus K, Brockhinke A. Zuschauen bei der chemischen Reaktion? Laserdiagnostik mit kurzen Lichtpulsen. In: Fritzsch H, ed. Materie in Raum und Zeit. Verhandlungen der Gesellschaft Deutscher Naturforscher und Ärzte. Verhandlungen der Gesellschaft Deutscher Naturforscher und Ärzte e.V. Vol 123. Stuttgart: Hirzel; 2005: 135-149
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