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Hybrid trapping of cold molecules and cold ions

Applicant Willitsch Stefan
Number 156182
Funding scheme Project funding
Research institution Physikalische Chemie Departement Chemie Universität Basel
Institution of higher education University of Basel - BS
Main discipline Physical Chemistry
Start/End 01.10.2014 - 30.09.2017
Approved amount 569'756.00
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Keywords (5)

ion trapping; cold molecules; reaction dynamics; cold chemistry; Coulomb crystals

Lay Summary (German)

Lead
Die Entwicklung experimenteller Techniken zur Kontrolle der Bewegung von Molekülen in der Gasphase hat in den letzten Jahren grosse Fortschritte gemacht. Moleküle können mit elektromagnetischen, elektrischen und magnetischen Feldern gezielt beeinflusst, abgekühlt und festgehalten werden. Mithilfe solcher Techniken ist es nun möglich, chemische Reaktionen bei extrem tiefen Temperaturen knapp über dem absoluten Nullpunkt zu untersuchen und chemische Reaktionsmechanismen sowie zwischenmolekulare Wechselwirkungen mit einer bisher nicht erreichbaren Genauigkeit aufzuschlüsseln.
Lay summary

Im vorliegenden Projekt kombinieren wir einen Stark-Entschleuniger zum Abbremsen von neutralen Molekülen mit einer Coulomb-Kristall-Apparatur zum Kühlen von atomaren und molekularen Ionen. Die abgebremsten neutralen Moleküle werden in einer Magnetfalle gefangen und mit kalten Ionen in einer Ionenfalle überlagert. Mithilfe dieser einzigartigen "hybriden" Falle für sowohl neutrale als auch geladene Moleküle wird es erstmals möglich sein, chemische Reaktionen zwischen geladenen und neutralen Spezies bei Temperaturen von wenigen hundertstel Grad über dem absoluten Nullpunkt zu untersuchen. Solche Untersuchungen werden es erstmals erlauben, Wechselwirkungen zwischen Ionen und neutralen Molekülen bei sehr tiefen Temperaturen zu charakterisieren sowie vertiefte Einblicke in die Quantendynamik und Mechanismen von ionischen Reaktionen zu gewinnen. Die Ergebnisse des vorliegenden Projekts werden dazu beitragen, die Reaktivität von geladenen Teilchen besser zu verstehen und neue Ansätze zur gezielten Kontrolle von ionischen Reaktionen zu entwickeln.

 

Direct link to Lay Summary Last update: 29.09.2014

Responsible applicant and co-applicants

Employees

Publications

Publication
Optimizing the density of Stark decelerated radicals at low final velocities: a tutorial review
Haas Dominik, Scherb Sebastian, Zhang Dongdong, Willitsch Stefan (2017), Optimizing the density of Stark decelerated radicals at low final velocities: a tutorial review, in EPJ Techniques and Instrumentation, 4(1), 6-6.
Superstatistical Energy Distributions of an Ion in an Ultracold Buffer Gas
Rouse I., Willitsch S. (2017), Superstatistical Energy Distributions of an Ion in an Ultracold Buffer Gas, in PHYSICAL REVIEW LETTERS, 118(14), 14301.
Chemistry with controlled ions
Willitsch Stefan (2017), Chemistry with controlled ions, in S. Rice A. Dinner (ed.), Wiley Interscience, Hoboken, 307.
Ion Coulomb crystals: From quantum technology to chemistry close to the absolute zero point
Dulieu Olivier, Willitsch Stefan (2017), Ion Coulomb crystals: From quantum technology to chemistry close to the absolute zero point, in Europhysics News, 48, 307.
Spektroskopie und Chemie mit kalten Ionen
Rösch Daniel, Willitsch Stefan (2017), Spektroskopie und Chemie mit kalten Ionen, in Nachrichten aus de Chemie, 65, 326.
A Dynamic Ion-Atom Hybrid Trap for High-Resolution Cold-Collision Studies
Eberle Pascal, Dorfler Alexander D., von Planta Claudio, Ravi Krishnamurthy, Willitsch Stefan (2016), A Dynamic Ion-Atom Hybrid Trap for High-Resolution Cold-Collision Studies, in CHEMPHYSCHEM, 17(22), 3769-3775.
Cold and intense OH radical beam sources
Ploenes Ludger, Haas Dominik, Zhang Dongdong, van de Meerakker Sebastiaan Y. T., Willitsch Stefan (2016), Cold and intense OH radical beam sources, in REVIEW OF SCIENTIFIC INSTRUMENTS, 87(5), 053305.
Ion-Atom and Ion-Molecule Hybrid Systems: Ion-Neutral Chemistry at Ultra low Energies
Eberle Pascal, Doerfler Alexander D., von Planta Claudio, Ravi Krishnamurthy, Haas Dominik, Zhang Dong, de Meerakker Sebastiaan Y. T. van, Willitsch Stefan (2015), Ion-Atom and Ion-Molecule Hybrid Systems: Ion-Neutral Chemistry at Ultra low Energies, in XXIX INTERNATIONAL CONFERENCE ON PHOTONIC, ELECTRONIC, AND ATOMIC COLLISIONS (ICPEAC2015), PTS 1-12, 635, IOP Press, London 635.
Superstatistical velocity distributions of cold trapped ions in molecular-dynamics simulations
Rouse I., Willitsch S. (2015), Superstatistical velocity distributions of cold trapped ions in molecular-dynamics simulations, in PHYSICAL REVIEW A, 92(5), 053420.
Cristaux coulombiens: De la technologie quantique a la chimie proche du zeroa bsolu
Dulieu Olivier, Willitsch Stefan (2015), Cristaux coulombiens: De la technologie quantique a la chimie proche du zeroa bsolu, in Reflets de la Physique, 44, 91.
Ion-atom hybrid systems
Willitsch Stefan (2015), Ion-atom hybrid systems, in Proc. Int. Sch. Phys. Enrico Fermi, IOS Press, Amsterdam.
Cold ion chemistry
Zhang Dong, Willitsch Stefan, Cold ion chemistry, in Dulieu Olivier, Osterwalder Andreas (ed.), Royal Society of Chemistry, London, 496.

Collaboration

Group / person Country
Types of collaboration
Prof. Sebastiaan Y.T. van de Meerakker Netherlands (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Prof. Michal Tomza Poland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Francesco Gianturco Austria (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
IBER 2017 Talk given at a conference Ion-atom and ion-molecule hybrid experiments: From cold to controlled chemistry 12.09.2017 Barcelona, Spain Willitsch Stefan;
SCS Fall Meeting 2017 Talk given at a conference Towards hybrid trapping of cold molecules and cold molecular ions 21.08.2017 Bern, Switzerland Zhang Dongdong;
Workshop on Controllable Quantum Impurities in Physics and Chemistry Talk given at a conference Collision dynamics in cold ion-atom hybrid systems 16.08.2017 Klosterneuburg, Austria Willitsch Stefan;
26. Dynamics of Molecular Collisions Talk given at a conference Cold and controlled chemistry: 
 From small molecules to complex systems 09.07.2017 Granlibakken, United States of America Willitsch Stefan;
24e Congrès Général de la Société Française de Physique Talk given at a conference Cold ion-neutral collisions:
 advances in theory and experiment 03.07.2017 Orsay, France Willitsch Stefan;
Spectroscopy, Dynamics and Applications of Cold Molecular Ions
 Talk given at a conference Cold ion-neutral collisions:
 advances in theory and experiment 28.06.2017 Les Houches, France Willitsch Stefan;
27. International Symposium on Molecular Beams Talk given at a conference Cold and controlled ion-neutral reactions 25.06.2017 Nijmegen, Netherlands Willitsch Stefan;
Physik-Kolloquium Individual talk Cold Molecular Ions in Traps: From Precision Spectroscopy to Controlled Collisions 10.01.2017 Innsbruck, Austria Willitsch Stefan;
Stereodynamcis 2016 Talk given at a conference New avenues for studies of chemical dynamics using cold and controlled molecules 06.11.2016 Taipei, Taiwan Willitsch Stefan;
NNV Amo Meeting Talk given at a conference Ion-atom and ion-molecule hybrid systems: 
new avenues for studying cold ion-neutral interactions 11.10.2016 Lunteren, Netherlands Willitsch Stefan;
Kolloquium Individual talk Cold Molecular Ions in Traps: From Precision Measurements on Single Molecules to the Precise Control of Chemical Reactions 29.09.2016 Lausanne, Switzerland Willitsch Stefan;
252. National Meeting of the American Chemical Society Talk given at a conference AMO methods for precise studies of chemical reactions 21.08.2016 Philadelphia, United States of America Willitsch Stefan;
2. Conference on Cold and Controlled Molecules and Ions Talk given at a conference Ion-atom and ion-molecule hybrid systems 13.03.2016 Rehovot, Israel Willitsch Stefan;
2. Conference on Cold And Controlled Molecules and Ions Poster Towards Hybrid Tapping of Cold Molecules and Cold Molecular Ions 13.03.2016 Rehovot, Israel Zhang Dongdong;
20. Symposium on Atomic, Surface and Cluster Physics Talk given at a conference Cold and Controlled Ion Chemistry 07.02.2016 Davos, Switzerland Willitsch Stefan;
20. Symposium on Atomic, Cluster and Surface Physics Poster Towards Hybrid Trapping of Cold Molecules and Cold Molecular Ions 07.02.2016 Davos, Switzerland Haas Dominik;
Swiss Snow Symposium Talk given at a conference Cold Molecular Ions in Traps: From Precision Measurements on Isolated Molecules to the Control of Chemical Reactions 22.01.2016 Saas-Fee, Switzerland Willitsch Stefan;
Colloquium Individual talk Cold Molecular Ions in Traps: From Precision Measurements on Isolated Molecules to the Control of Chemical Reactions 17.12.2015 Warsaw, Poland Willitsch Stefan;
Workshop on Hybrid Atomic Quantum Systems Talk given at a conference Next-generation ion-neutral hybrid traps 27.09.2015 Hamburg, Germany Willitsch Stefan;
SCS Fall Meeting 2015 Poster Towards Hybrid Trapping of Cold Molecules and Cold Molecular Ions 04.09.2015 Lausanne, Switzerland Haas Dominik;
Kolloquium Individual talk Cold molecular ions in traps: 
From cold collisions to precision measurements 27.08.2015 Beijing, China Willitsch Stefan;
33. International Symposium 
on Free Radicals Talk given at a conference Cold and Controlled Ion-Neutral Reactions 02.08.2015 Squaw Valley, United States of America Willitsch Stefan;
XXIX. ICPEAC Talk given at a conference Ion-Atom and Ion-Molecule Hybrid Systems: Ion-Neutral Chemistry at Ultralow Energies 22.07.2015 Toledo, Spain Willitsch Stefan;
Defining New Directions in Cold Chemical Physics Poster A traveling wave Zeeman decelerator 08.07.2015 Boulder, United States of America Zhang Dongdong;
594. WE Heraeus Seminar “Spectroscopy and Applications of Cold Molecular Ions” Talk given at a conference New developments in cold ion chemistry 15.06.2015 Bad Honnef, Germany Willitsch Stefan;
Towards Hybrid Trapping of Cold Molecules and Cold Molecular Ions Poster 594. WE-Heraeus Seminar on Spectroscopy and Applications of Cold Molecular Ions 15.06.2015 Bad Honnef, Germany Haas Dominik;
SFB/TRR21-Kolloquium Individual talk Reactive processes in ion-atom hybrid systems 24.04.2015 Stuttgart, Germany Willitsch Stefan;
Kolloquium Individual talk Cold Molecular Ions in Traps: From Precision Measurements on Isolated Molecules to the Control of Chemical Reactions 10.04.2015 Klosterneuburg, Austria Willitsch Stefan;
Bothe-Kolloquium Individual talk Cold Molecular Ions in Traps 28.01.2015 Heidelberg, Germany Willitsch Stefan;
8. Photodynamics Talk given at a conference Cold and controlled ion chemistry 26.10.2014 Oaxaca, Mexico Willitsch Stefan;


Self-organised

Title Date Place
4. European Conference on Trapped Ions 29.08.2016 Arosa, Switzerland

Associated projects

Number Title Start Funding scheme
175533 Hybrid trapping of cold molecules and cold ions: state-controlled ion-molecule interactions, collisions and reactions in the millikelvin regime 01.10.2017 Project funding
157770 Basel Shared Frequency Comb Facility 01.12.2014 R'EQUIP
157874 Conformationally controlled chemistry 01.09.2015 SNSF Consolidator Grants

Abstract

The recent development of ”hybrid” traps for the simultaneous trapping of cold atoms and cold ions has initiated a new field of research concerned with the study of ion-atom interactions at extremely low temperatures. This new technology has opened up exciting new research directions such as the possibility to engineer new types of quantum systems and to explore ion-neutral collisions and chemical reactions at ultralow collision energies.We propose to develop a new experimental setup which will enable for the first time the simultaneous trapping of neutral molecules and molecular ions at translational temperatures down to millikelvins (the ”cold regime”), thereby pushing hybrid trapping technology to a new level. Translationally cold molecules will be generated by Stark deceleration of molecular beams. The cold molecules will be loaded into a magnetic trap integrated into a linear radiofrequency ion trap. Cold atomic and molecular ions will be generated by laser and sympathetic cooling, respectively, forming Coulomb crystals to be superimposed onto the cloud of cold molecules stored in the magnetic trap. Both species will be prepared in well-defined electronic, vibrational and rotational quantum states thus enabling the characterization of state-specific effects in cold ion-molecule interactions. The hybrid trap will be placed in a cryogenic environment held at a temperature T=10 K to suppress the blackbody-radiation assisted redistribution of internal-state populations of the molecules. This measure will serve to preserve the internal molecular states and increase the trap lifetimes of the neutrals by several orders of magnitude.The development proposed here will enable for the first time the study of collisions between neutral molecules and molecular ions in the cold regime and will pave the way for the exploration of distinctly molecular effects in ion-neutral interactions at very low translational temperatures. With the new setup, we will study the dynamics of cold collisions and explore elastic, inelastic and reactive processes between molecular ions and neutral molecules. Collision and reaction cross sections will be obtained as a function of the internal quantum states of the collision partners and their collision energy. The experimental results will be analyzed with the help of classical and quantum scattering calculations. Our first studies will concentrate on prototypical collision systems such as OH + Ca+, N2+ and H2O+.
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