A5028487967- Spectroscopy and Laser Applications
- Combustion and flame dynamics
- Law and Political Science
- Advanced Combustion Engine Technologies
- Atmospheric chemistry and aerosols
- Copyright and Intellectual Property
- Laser-induced spectroscopy and plasma
- Digitalization, Law, and Regulation
- Intellectual Property Law
- Laser Design and Applications
- Law in Society and Culture
- Digital Rights Management and Security
- Atmospheric Ozone and Climate
- Analytical Chemistry and Sensors
- Catalytic Processes in Materials Science
- Diverse Legal and Medical Studies
- nanoparticles nucleation surface interactions
- Public Administration and Political Analysis
- Atmospheric and Environmental Gas Dynamics
- Spectroscopy and Quantum Chemical Studies
- European history and politics
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Digital Innovation in Industries
- Spectroscopy Techniques in Biomedical and Chemical Research
University of Duisburg-Essen
2016-2025
Karlsruhe Institute of Technology
2010-2025
Karlsruhe University of Education
2005-2024
BG University Hospital Bergmannsheil Bochum
2024
Max Planck Society
1995-2023
Praxis
2023
Georgetown University
2023
Universitätsmedizin Göttingen
2023
University of Kassel
2023
University of Fribourg
2023
Temperatures have been measured in a laminar premixed propane–air diffusion flame using degenerate four-wave mixing (DFWM) of the OH radical. The spectra were recorded simultaneously with laser-induced fluorescence through (0, 0) band A2Σ–X2II transition. Individual rotational lines are more clearly resolved DFWM spectrum than spectrum, although both power broadened at laser intensities 1–2 MW/cm2 307 nm. Rotational temperatures determined from and close agreement coherent anti-Stokes Raman...
The computed tomography of chemiluminescence (CTC) technique was applied for the first time to a real highly turbulent swirl flame setup, using large number CCD cameras (Nq=24 views), directly reconstruct three-dimensional instantaneous and time-averaged fields. views were obtained from 172.5° region (in one plane) around flame, CTC algorithm [Floyd et al., Combust. Flame158, 376 (2011)CBFMAO0010-2180] used by discretizing domain into voxels. We investigated how reconstructions are affected...
Laser-induced incandescence (LII) is a widely used combustion diagnostic for in situ measurements of soot primary particle sizes and volume fractions flames, exhaust gases, the atmosphere. Increasingly, however, it applied to characterize engineered nanomaterials, driven by increasing industrial relevance these materials fundamental scientific insights that may be obtained from measurements. This review describes state art as well open research challenges new opportunities arise LII on...
We report an investigation of the dependence on transition dipole moment isolated line intensities in degenerate four-wave mixing A2Σ+ (υ′ = 0) ← X2Π (υ″ band for NO. For spectrally integrated we found that was well described by a power law μx, where μ is one-photon moment. As result saturation, exponent x depends laser intensity. The observations are reasonable agreement with simple two-level model [ Opt. Lett.294 ( 1978);Opt. Lett.3, 205 1978)], which predicts limiting dependences μ8 and...
Premixed, laminar H2/O2/Ar and CH4/O2/N2 low-pressure flat flames doped with iron pentacarbonyl (Fe(CO)5) were used to investigate the initial steps towards formation of iron-oxide nanoparticles. The particles extracted from flame using a molecular beam sampling probe mass flow rate condensed material was measured by quartz crystal microbalance (QCM). It observed that are already formed on cold side flame, vanish quickly once they pass through front. To understand process assess...
Degenerate four-wave mixing is used to produce two-dimensional images of OH distributions in atmospheric-pressure flames. The phase-conjugated from single laser pulses exhibit excellent signal-to-noise ratios and illustrate that degenerate has outstanding potential as a multidimensional diagnostic for combustion environments.
Studying soot particle morphology in high-pressure flames via thermophoretic sampling critically depends on precision, speed, and reproducibility. This is mainly limited by the challenges of applying pneumatically driven devices for burner chamber pressures higher than pneumatic pressure. We present a device applications up to 90 bars. The novelty separate driver section from environment chamber. was tested laminar flame at 20
To fully master a scaled-up combustion synthesis of nanoparticles toward wide library materials with tailored functionalities, detailed understanding the underlying kinetic mechanism is required. In this respect, flame iron oxide model case, being one better understood systems and guiding way how other material could be advanced. mini-review, we highlight, on example an system, approach combining laser spectroscopy mass spectrometry simulations. The experiments deliver information...