title: UV and VUV ionization of organic molecules, clusters, and complexes.
abstract: The generation of organic particle beams is studied in combination with photoionization using UV radiation at 266 nm and vacuum ultraviolet (VUV) light at 157 nm. Single-photon ionization with pulsed VUV light turns out to be sensitive enough to detect various large neutral biomolecular complexes ranging from metal-amino acid complexes to nucleotide clusters and aggregates of polypeptides. Different biomolecular clusters are shown to exhibit rather specific binding characteristics with regard to the various metals that are codesorbed in the source. We also find that the ion signal of gramicidin can be increased by a factor of 15 when the photon energy is increased from 4.66 to 7.9 eV.
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria. markus.arndt@univie.ac.at
authors.forename: Markus
authors.initials: M
authors.lastname: Marksteiner
authors.forename: Philipp
authors.initials: P
authors.lastname: Haslinger
authors.forename: Michele
authors.initials: M
authors.lastname: Sclafani
authors.forename: Hendrik
authors.initials: H
authors.lastname: Ulbricht
authors.forename: Markus
authors.initials: M
authors.lastname: Arndt
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D000900:Anti-Bacterial Agents / Q000737:chemistry; D006096:Gramicidin / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D008027:Light; D008670:Metals / Q000737:chemistry; D015394:Molecular Structure; D009930:Organic Chemicals / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry; D010455:Peptides / Q000737:chemistry; D055668:Photochemical Processes; D017785:Photons; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D014466:Ultraviolet Rays; D014618:Vacuum
chemical_list: D000596:Amino Acids; D000900:Anti-Bacterial Agents; D007477:Ions; D008670:Metals; D009930:Organic Chemicals; D009942:Organometallic Compounds; D010455:Peptides; D006096:Gramicidin