Lab Key visual

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

S. D. S. Gordon; J. J. Omiste; J. Zou; S. Tanteri; P. Brumer et al.

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

J. Zou; S. D. S. Gordon; S. Tanteri; A. Osterwalder

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

DOI : 10.1063/1.5026952.

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

J. Zou; S. D. S. Gordon; S. Tanteri; A. Osterwalder

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

S. D. S. Gordon; J. Zou; S. Tanteri; J. Jankunas; A. Osterwalder

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

3D-Printed Beam Splitter for Polar Neutral Molecules

S. D. Gordon; A. Osterwalder

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

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

O. Dulieu; A. Alnaser; J. Colgan; E. Grant; E. Krishnakumar et al.

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

S. D. S. Gordon; A. Osterwalder

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

2016

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

K. Jachymski; M. Hapka; J. Jankunas; A. Osterwalder

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

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

J. Jankunas; K. Jachymski; M. Hapka; A. Osterwalder

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

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

J. Jankunas; K. S. Reisyan; T. P. Rakitzis; A. Osterwalder

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

J. Jankunas; K. Jachymski; M. Hapka; A. Osterwalder

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

Cold and Controlled Molecular Beams: Production and Applications

J. Jankunas; A. Osterwalder2015.

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

J. Jankunas; K. S. Reisyan; A. Osterwalder

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

2014

Viewpoint: Slowing Continuous Molecular Beams in a Rotating Spira

A. Osterwalder

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

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

J. Jankunas; B. Bertsche; A. Osterwalder

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

J. Jankunas; B. Bertsche; K. Jachymski; M. Hapka; A. Osterwalder

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

Low-temperature Collisions between Neutral Molecules in Merged Molecular Beams

B. Bertsche; J. Jankunas; A. Osterwalder

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

N. E. Bulleid; R. J. Hendricks; E. A. Hinds; S. A. Meek; G. Meijer et al.

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

LASER PARTICLE ACCELERATION Pushing atoms with light

A. Osterwalder

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

2011

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

B. Bertsche; A. Osterwalder

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

A traveling wave decelerator for neutral polar molecules

S. A. Meek; M. F. Parsons; G. Heyne; V. Platschkowski; H. Haak et al.

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

2010

State-selective detection of velocity-filtered ND3 molecules

B. Bertsche; A. Osterwalder

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

Deceleration of neutral molecules in macroscopic traveling traps

A. Osterwalder; S. A. Meek; G. Hammer; H. Haak; G. Meijer

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

2006

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

M. J. Nee; A. Osterwalder; J. Zhou; D. M. Neumark

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

M. J. Nee; A. Osterwalder; J. Zhou; D. M. Neumark

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

T. Xie; A. L. Kaledin; J. M. Bowman; S. Carter; M. J. Nee et al.

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

A. Osterwalder; M. J. Nee; J. Zhou; D. M. Neumark

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

DOI : 10.1063/1.1787491.

2001

Threshold photoionization at high resolution

F. Merkt; A. Osterwalder; U. Hollenstein; R. Seiler; M. Sommavilla

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

U. Hollenstein; R. Seiler; A. Osterwalder; M. Sommavilla; A. Wuest et al.

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