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, 2017.

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, 2017.

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, 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)














horizontal rule


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



All about SFG experiments(New)

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


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This site was last updated 12/10/13