We study gas-phase chemical reactions in which we aim to control all degrees of freedom of the colliding particles, including internal states, relative velocity, and relative orientation. Observing a molecular scattering event with this degree of control provides the deepest insight into chemical reactions and allows us to study some of the most fundamental concepts in chemistry.

We investigate, in partiucular, polyatomic chemical reactions at energies as little as 80 mK above absolute zero. We reach these low collision energies merging two neutral supersonic expansions into a single beam such that relative molecular velocities are low even if the beams are fast in the laboratory.

# 2018

### Quantum-state-controlled channel branching in cold Ne(3P2)+Ar chemi-ionization

Nature Chemistry. 2018-10-08. Vol. 43 , p. 7279.

DOI : 10.1038/s41557-018-0152-2.

### Stereodynamics of Ne(3P2) reacting with Ar, Kr, Xe, and N2

The Journal of Chemical Physics. 2018-04-30. Vol. 148 , num. 16 , p. 164310.

DOI : 10.1063/1.5026952.

# 2017

### Cold Chemistry: Molecular Scattering and Reactivity Near Absolute Zero

The Royal Society of Chemistry, 2017 - ISBN : 978-1-78262-597-1.

DOI : 10.1039/9781782626800.

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

Physical Review Letters. 2017. Vol. 119 , p. 053001.

### 3D-Printed Beam Splitter for Polar Neutral Molecules

Physical Review Applied. 2017. Vol. 7 , num. 4 , p. 044022.

### Call for papers: Roll over hydrogen: a fundamental system in all states

Journal Of Physics B-Atomic Molecular And Optical Physics. 2017. Vol. 50 , num. 1 , p. 010201.

### A 3D printed beam splitter for polar neutral molecules

Physical Review Applied. 2017. Vol. 7 , num. 4 .

# 2016

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

ChemPhysChem. 2016. Vol. 17 , p. 3776.

### Importance of rotationally inelastic processes in low-energy Penning ionization of CHF3

Journal of Chemical Physics. 2016. Vol. 144 , p. 221102.

### Oriented O(3P2), Ne(3P2), and He(3S1) atoms emerging from a bent magnetic guide

Molecular Physics. 2016. Vol. 114 , num. 2 , p. 245-252.

# 2015

### Merged neutral beams

A. Osterwalder2015.

### Observation of orbiting resonances in He(3S1) + NH3 Penning ionization

The Journal of Chemical Physics. 2015. Vol. 142 , num. 16 , p. 164305.

### Preparation of state purified beams of He, Ne, C, N, and O atoms

The Journal of Chemical Physics. 2015. Vol. 142 , num. 10 , p. 104311.

# 2014

### Viewpoint: Slowing Continuous Molecular Beams in a Rotating Spira

Physics. 2014. Vol. 7 , p. 2.

### Study of the Ne(3P2) + CH3F Electron-Transfer Reaction below 1 K

The Journal of Physical Chemistry A. 2014. Vol. 118 , num. 22 , p. 3875-3879.

### Dynamics of gas phase Ne* + NH3 and Ne* + ND3 Penning ionisation at low temperatures

Journal of Chemical Physics. 2014. Vol. 140 , p. 244302.

### Low-temperature Collisions between Neutral Molecules in Merged Molecular Beams

Chimia. 2014. Vol. 68 , num. 4 , p. 256-259.

### Low Energy Collisions in Merged Neutral Molecular Beams

B. Bertsche / A. Osterwalder (Dir.)

Lausanne: EPFL, 2014.

# 2012

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

Physical Review A. 2012. Vol. 86 , num. 2 .

### LASER PARTICLE ACCELERATION Pushing atoms with light

Nature Photonics. 2012. Vol. 6 , p. 344-347.

# 2011

### Dynamics of individual rotational states in an electrostatic guide for neutral molecules

Physical Chemistry Chemical Physics. 2011. Vol. 13 , p. 18954.

### A traveling wave decelerator for neutral polar molecules

Review of Scientific Instruments. 2011. Vol. 82 , num. 9 , p. 093108.

# 2010

### State-selective detection of velocity-filtered ND3 molecules

Physical Review A. 2010. Vol. 82 , num. 3 , p. 033418.

### Deceleration of neutral molecules in macroscopic traveling traps

Physical Review A. 2010. Vol. 81 , num. 5 , p. 051401.

# 2006

### Slow electron velocity-map imaging photoelectron spectra of the methoxide anion

Journal of Chemical Physics. 2006. Vol. 125 , num. 1 , p. 014306/1-014306/9.

DOI : 10.1063/1.2212411.

# 2005

### High resolution photoelectron spectra of carbon cluster anions and their monohydrides

Abstracts of Papers, 229th ACS National Meeting, San Diego, CA, United States, March 13-17, 2005. 2005. p. PHYS-385.

# 2004

### Theoretical and experimental study of the IR spectrum of the BrHI and BrDI anions

Abstracts of Papers, 228th ACS National Meeting, Philadelphia, PA, United States, August 22-26, 2004. 2004. p. PHYS-528.

### High resolution photodetachment spectroscopy of negative ions via slow photoelectron imaging

Journal of Chemical Physics. 2004. Vol. 121 , num. 13 , p. 6317-6322.

DOI : 10.1063/1.1787491.

# 2001

### Threshold photoionization at high resolution

Abstracts of Papers, 221st ACS National Meeting, San Diego, CA, United States, April 1-5, 2001. 2001. p. PHYS-041.

### High-resolution vacuum ultraviolet photoelectron spectroscopy

Chimia. 2001. Vol. 55 , num. 10 , p. 759-762.