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MO: Fachverband Molekülphysik

MO 8: Poster 1

MO 8.4: Poster

Tuesday, March 15, 2022, 16:30–18:30, P

Laser-heated molecular deposition source — Fabiano Lever, Alanas Straeck, and •Lisa Mehner — University of Potsdam, Potsdam, Germany

We present a setup for the laser-induced desorption of molecular samples, to be used as a sample delivery system in ultrafast experiments in gas-phase.

For the commissioning, we used a phenylalanine sample, which has been used with such a source before [1].We explore different sample preparation methods, which are then tested for their reliability.

The samples are applied on Al-foil and inserted into a vacuum chamber. An infrared diode-laser heats the foil, causing molecular desorption. We use a quartz-balance to measure the rate of desorption. We systematically vary the experimental parameters, such as the laser intensity, to characterize their relation to the sample desorption rate.

Multiple solvents have been tested, with the most promising being the use of a water-based soultion. This produces a thin layer of phenylalanine on the foil after drying off.

[1] F. Calegari et al, Science 246, 336 (2014)