René Reiss

Laser desorption and detection of security relevant substances

The task within this project is to develop a measurement system that can be used for the fast and reliable detection of security relevant substances on surfaces. Advantages of this technique will be direct (without sample pre-treatment) results and the possibility to measure even at difficulty accessible places through a mobile measurement system. The measuring principle is based on the sample desorption from a surface with laser light pulses at the nanosecond timescale. Because of this short pulses the samples thermal stress is reduced to achieve less fragmentation. By separating desorption and ionisation processes, it is possible to further enhance flexibility and selectivity by using different ionisation techniques. Iontrap mass spectrometer and ion mobility spectrometer as well as other techniques will be used as detection systems.