Publications by Andreas Osterwalder

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A technique for high resoln. anion photodetachment spectroscopy is presented that combines velocity map imaging and anion threshold photodetachment. This method, slow electron velocity-map imaging, provides spectral line widths of better than 1 meV. Spectra over a substantial range of electron kinetic energies are recorded in a single image, providing a dramatic redn. of data acquisition time compared to other techniques with comparable resoln. We apply this technique to at. iodine and the van der Waals clu

The development of narrow bandwidth tunable laser systems in the vacuum UV region of the electromagnetic spectrum and of new exptl. methods has recently enabled a significant improvement in the resoln. that can be achieved by photoelectron spectroscopy. This improvement opens new perspectives in fundamental studies of the electronic structure and dynamics of neutral and charged mol. systems. [on SciFinder (R)]

Controlling reactions between molecules is a major fundamental goal in chemistry and doing so on the level of individual quantum states is very challenging. Now, control over the reactant state and full characterization of the product-state distribution of ...

Ionization processes, promoted by the collisions of CO molecule with noble gas atoms electronically excited in a metastable state, as Ne*, are known as chemi-ionization (CHEMI) reactions. CHEMI reactions of CO have been experimentally investigated in vario ...

A decelerator is presented where polar neutral molecules are guided and decelerated using the principle of traveling electric potential wells, such that molecules are confined in stable three-dimensional traps throughout. We compare this decelerator with t ...

Translationally cold and slow ND3 is prepared by filtering the slow molecules from a thermal gas-phase sample using a curved electrostatic hexapole guide. This filter, like the curved quadrupole guide introduced by Rangwala et al. Phys. Rev. A 67 043406 (2 ...

We present results from a joint theoretical and experimental study of the low-energy Penning ionization of NH3, CH3F, and CHF3 by metastable Ne(P-3(2)) and He(S-3(1)) atoms. We combine the merged neutral beams experiment, covering a range of collision ener ...

A new approach to the continuous deceleration of polar molecules uses a rotating guide to slow the molecules down.

We demonstrate the deceleration of heavy polar molecules in low-field-seeking states by combining a cryogenic source and a traveling-wave Stark decelerator. The cryogenic source provides a high-intensity beam with low speed and temperature, and the traveli ...

The control of movement and orientation of gas-phase molecules has become the focus of many research areas in molecular physics. Here, ND3 molecules are polarized in a segmented, curved electrostatic guide and adiabatically aligned inside a rotatable mass ...

The present study exploits the recent formulation of the optical potential that provided an internally consistent representation of the interaction between Ne*(3P2,0) + CO reagents and Ne + CO+(X2Σ, A2Π) products. The coupling between neutral entrance and ...

We present chemical kinetics measurements of the luminol oxidation chemiluminescence (CL) reaction at the interface between two aqueous solutions, using liquid jet technology. Free-flowing liquid microjets are a relatively recent development that have foun ...

The stereodynamics of the Ne(3P2)+Ar Penning and Associative ionization reactions have been studied using a crossed molecular beam apparatus. The experiment uses a curved magnetic hexapole to polarise the Ne(3P2) which is then oriented with a shaped magnet ...

Streuprozesse zwischen zwei Reaktanden in Experimenten zur Reaktionsdynamik sollen Hinweise auf die Potenzialfläche liefern, auf der sich die Reaktion abspielt und die das System vollständig beschreibt. Solche Experimente erfordern es, sämtliche internen Bewegungsfreiheitsgrade der Reaktanden und Reaktionsprodukte zu kennen und zu kontrollieren.

Andreas Osterwalder

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High resolution photodetachment spectroscopy of negative ions via slow photoelectron imaging

High-resolution vacuum ultraviolet photoelectron spectroscopy

Ultimate control in chemistry

The optical potential for Ne*(3P2,0) + CO chemi-ionization reactions: Nature of the intermolecular forces and selective formation of CO+ in ground (2Σ) and excited (2Π) electronic states

Deceleration of neutral molecules in macroscopic traveling traps

Alignment of ND3 molecules in dc-electric fields (vol 160, 204305, 2024)

State-selective detection of velocity-filtered ND3 molecules

Experimental and Theoretical Studies of Low-Energy Penning Ionization of NH3, CH3F, and CHF3

Viewpoint: Slowing Continuous Molecular Beams in a Rotating Spiral

Traveling-wave deceleration of heavy polar molecules in low-field-seeking states

Alignment of ND3 molecules in dc-electric fields

Ne*(3P2,0) + CO chemi-ionization reactions: Atomic alignment and molecular orientation effects

MARTEMIS: Martian Analog Research and Training Experiments on the Moon with International Simulations

LASER PARTICLE ACCELERATION Pushing atoms with light

Imaging of Chemical Kinetics at the Water–Water Interface in a Free-Flowing Liquid Flat-Jet

Energy dependent stereodynamics of the Ne(3P2)+Ar reaction

Trendbericht Physikalische Chemie: Kalte Reaktionsdynamik unter Kontrolle