Probing minerals using Raman spectroscopy

This project aims at covering the fundamental aspects of mineral formation and structure using state of the art micro-Raman spectroscopy. Raman spectroscopy uses single frequency electromagnetic radiation in the visible region and upon interaction with matter, a tiny portion of this radiation experiences inelastic scattering (energy shift with respect to the incoming radiation) that corresponds to different molecular vibrations present in the investigated material. The Raman system is coupled to light microscope configuration that allows to perform high spatial resolution Raman spectroscopy. Hence, it is an excellent tool to follow phase transitions, study materials formation from precursors in liquid environment and observe local inhomogeneities or structural variations due to ion doping. The main building blocks of my studies are focused on two areas:

1. In-situ time-resolved Raman investigation of the formation of calcium sulfates (gypsum, basanite) from solutions in a home-built fluid cell. The fluid cell consists of a glass capillary tube that is used for constant liquid flow using a peristaltic pump. Excitation laser is focused within the capillary tube and Raman spectra are recorded as a function of time to observe the nucleation and growth of calcium sulfate crystals.

2. Ex-situ Raman investigation of the structure of various mineral such as calcium carbonate, struvite, green rust. The sample is mounted on a glass slide and Raman spectra are recorded at different spots for systematic sample mapping.

Contact

Profile photo of  Dr. Konstantinos Chatzipanagis

Dr. Konstantinos Chatzipanagis
Interface Geochemistry

Telegrafenberg
Building C, room 122
14473 Potsdam
tel. +49 331 288-27532

PI

Profile photo of  Prof. Dr. Liane G. Benning

Prof. Dr. Liane G. Benning
Interface Geochemistry

Telegrafenberg
Building C, room 124
14473 Potsdam
tel. +49 331 288-28970