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Atmospheric Surface Science Nonlinear optical spectroscopy |
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Studying
the ice nucleation (IN) mechanism, particularly heterogeneous IN, is very
important for understanding the criteria of formation of different types of
clouds, which in turn has its influence on climate change. Despite all
investigations on particle size and surface properties of IN agents upon
nucleation efficiency, no clear statement is given about IN process.
Technical and environmental issues require a good understanding of ice
freezing on the surfaces of IN agents, particularly on the molecular level. A
new research group started at IMK-AAF to investigate atmospheric
interactions and water/IN agent surface interactions on the molecular level.
For more details please visit the official
webpage. Related
publications: Abdelmonem,
A.: Direct molecular level characterization of different heterogeneous
freezing modes on mica, Atmos. Chem. Phys. Discuss., 2017, 1-8, doi: 10.5194/acp-2017-322 Abdelmonem,
A., Backus, E. H. G., Hoffmann, N., Sánchez, M. A.,
Cyran, J. D., Kiselev, A., and Bonn, M.: Surface charge-induced orientation
of interfacial water suppresses heterogeneous ice nucleation on
α-alumina (0001), Atmos. Chem. Phys. Discuss., 2017, 1-13, doi: 10.5194/acp-2017-224 Abdelmonem,
A., Lützenkirchen, J., and Leisner, T.: Probing ice-nucleation processes on
the molecular level using second harmonic generation spectroscopy, Atmos.
Meas. Tech., 8, 3519-3526, doi: 10.5194/amt-8-3519-2015 @ EGU
2017 1. Does deposition freezing really exist? At least different
as we thought, Ahmed Abdelmonem (pdf) 2. Coupling non-linear optical spectroscopy and surface
chemistry: Towards new insights in atmospheric chemistry and aerosols, Ahmed
Abdelmonem and Johannes Lützenkirchen (pdf) |
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Nonlinear
optical spectroscopy at the
Liquid-
/ Solid- interface
To download the dissertation as a pdf
file click here
To download the animation
version of Figure 3-4 (Full and OH region) click here
To download the
animation version of Figure 3-4 (CH region) click here
To download the animation
version of Figure 3-9 click here
To download the animation
version of Figure 2-12 click here
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All about SFG experiments Secrets, tricks, finding signal (how to find the signal as a kids game), alignment and optimization, technical
recommendations, important calculations, system stability, optic and
electronic noise, data manipulation and fitting (are you interested in fitting n number of parameters? Kinder leicht), polarization conservation, best geometry
and sample dimensions calculations, different configurations, how to increase
signal to noise ratio, how to reduce pointing fluctuations at the sample
interface, how to correlate for the spatial overlap arises from the scanning
mechanism (spatial overlap calibration) ..... etc Click here |
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This site
was last updated 12/10/13