Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques

MO 13.20: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

IR and UV spectroscopy of biomolecular ions in liquid helium droplets — •Doo-Sik Ahn, Ana Isabel Gonzalez Florez, and Gert von Helden — Fritz-Haber-Institut, Berlin, Germany

Liquid helium droplets are ideal nano-cryostats for the investigation of molecules because of intrinsic characters of superfluid helium droplets such as isothermality at 0.38 K, the weak interaction between the helium matrix and dopant, and a transparency over a wide spectral range from the far IR to the deep UV. For the application of this technique to the cooling and spectroscopic investigation of biomolecular ions in the gas phase, we have developed an experimental setup where mass/charge selected biomolecular ions picked up by helium droplets. The size-distributions of ion-doped He droplets are analyzed by the measurement of arrival time distributions at different acceleration field. IR and UV Spectroscopy can be performed by irradiating the ion-doped He droplets with a pulsed laser and monitoring ejected ions as a function of wavelength. We will report very recent result of IR spectroscopy of various peptide ions doped in He droplets using FHI(Fritz-Haber-Institut) free electron laser, and UV spectroscopy as well.