Wieland Schöllkopf

Nondestructive mass selection of small van der waals clusters.

Clusters of atoms or molecules have been extensively studied by a variety of spectroscopies because of their unusual properties. Experiments with van der Waals clusters of defined sizes are not easily possible because nozzle beam expansions used in their production yield broad size distributions. Moreover, being weakly bound they readily fragment in the commonly used electron impact-ionization mass spectrometer detectors. Here it is shown that light fragile clusters of He, H2, and D2 can be selected and identified nondestructively by diffraction from a transmission grating. The method is universally applicable also to heavier species and well suited for spectroscopic studies.

The nondestructive detection of the helium dimer and trimer

A transmission grating is used to nondestructively analyze a low source temperature (6–60 K) beam of helium for small clusters. He2 and He3 are clearly resolved in first order diffraction. The relative ionization and fragmentation probabilities are measured and lend support to a recent mass spectrometer experiment claiming detection of He2.

Determination of Atom-Surface van der Waals Potentials from Transmission-Grating Diffraction Intensities

Molecular beams of rare gas atoms and

Protomers of Benzocaine: Solvent and Permittivity Dependence

{\mathrm{D}}_{2}

The formation of dimers and trimers in free jet 4He cryogenic expansions

have been diffracted from 100-nm-period

Interatomic Coulombic Decay following Photoionization of the Helium Dimer: Observation of Vibrational Structure

{\mathrm{SiN}}_{x}

The new IR and THz FEL facility at the Fritz Haber Institute in Berlin

transmission gratings. The relative intensities of the diffraction peaks out to the eighth order depend on the diffracting particle and are interpreted in terms of effective slit widths. These differences have been analyzed by a new theory which accounts for the long-range van der Waals

An infrared spectroscopy approach to follow β-sheet formation in peptide amyloid assemblies

{\ensuremath{-}C}_{3}/{l}^{3}

Spectroscopic Identification of a Bidentate Binding Motif in the Anionic Magnesium–CO2 Complex ([ClMgCO2]−)

interaction of the particles with the walls of the grating bars. The values of the

Structure and Fluxionality of B13 + Probed by Infrared Photodissociation Spectroscopy

{C}_{3}