Darmstadt 2008 – scientific programme

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MO: Fachverband Molekülphysik

MO 14: Cluster

MO 14.1: Talk

Thursday, March 13, 2008, 08:30–08:45, 3G

Pulsed Molecular Beams of Nucleobases — •Adnan Sarfraz, Klaus Rademann, and Wolfgang Christen — Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin

Transfer of non-volatile and thermally unstable molecules into the gas phase is important for a variety of applications such as analytical mass spectrometry, optical spectroscopy and thin film growth. Supercritical fluids may be used to dissolve molecules at moderate temperature and pressure conditions. This property can be utilized for the molecular beam expansion of thermally labile molecules without the use of significant heat. Extending our previous work [1] we present mass spectra of five biologically relevant nucleic acids (adenine, guanine, cytosine, thymine, and uracil) in a pulsed molecular beam. The molecules are deposited onto a polycrystalline gold surface and studied using Atomic Force Microscopy as well as Thermal Desorption Spectroscopy.

[1] W. Christen, S. Geggier, S. Grigorenko, K. Rademann, Rev. Sci. Instrum. 75, 5048 (2004).