Controlling chemical reactions of a single particle

  title={Controlling chemical reactions of a single particle},
  author={Lothar Ratschbacher and Christoph Zipkes and Carlo Sias and Michael K{\"o}hl},
  journal={Nature Physics},
  pages={649 - 652}
Chemical reactions between a single trapped ion and a condensate of ultracold neutral atoms are investigated by controlling the quantum states of both ion and atoms—revealing the effect of the hyperfine interaction on the reaction dynamics. Traditionally, chemical reactions have been investigated by tuning thermodynamic parameters, such as temperature or pressure. More recently, laser1 or magnetic field2 control methods have emerged to provide new experimental possibilities, in particular in… 

Quantum-Logic Detection of Chemical Reactions

Studies of chemical reactions by a single pair of atoms in a well defined quantum state constitute a corner stone in quantum chemistry. Yet, the number of demonstrated techniques which enable

Reaction blockading in a reaction between an excited atom and a charged molecule at low collision energy

The reaction between an excited atom and a charged molecule has now been studied at low temperature and a reaction blockading effect has been observed that differs significantly from what is expected from standard chemical capture theory.

Spin-controlled atom–ion chemistry

Spin-exchange process is discussed and the spin state of an ensemble of neutral Rb atoms can be used to control the final spin of an imbedded Sr+ ion in the collisions, which agrees with theoretical predictions.

Quantum logic detection of collisions between single atom–ion pairs

Studies of interactions between a single pair of atoms in a quantum state are a corner-stone of quantum chemistry, yet the number of demonstrated techniques that enable the observation and control of

Studying Charge-Exchange in a Hybrid Ion-neutral Trap

Interactions between neutral and ionized atoms are medium-range, and the spiraling nature of these collisions can lead to long interaction times and large crosssections. The field of ion-neutral

Chemistry Using Coulomb Crystals

Laser cooling of atomic ions has long been used as a tool in physics to explore quantum entanglement for applications in quantum computing and information. More recently, laser-cooled atomic ions

Millikelvin reactive collisions between sympathetically cooled molecular ions and laser-cooled atoms in an ion-atom hybrid trap.

A study of cold reactive collisions between sympathetically cooled molecular ions and laser-cooled atoms in an ion-atom hybrid trap provides a test of classical models for reactions of molecular ions at the lowest energies reached thus far.

Cold hybrid ion-atom systems

Hybrid systems of laser-cooled trapped ions and ultracold atoms combined in a single experimental setup have recently emerged as a new platform for fundamental research in quantum physics. This paper

Ultracold ion-atom experiments: cooling, chemistry, and quantum effects

Observation of Feshbach resonances between a single ion and ultracold atoms

Feshbach resonances between ions and atoms are demonstrated, using magnetically tunable interactions between 138Ba+ ions and 6Li atoms, giving access to complex many-body systems and applications in experimental quantum simulation.



A trapped single ion inside a Bose–Einstein condensate

This work investigates whether atomic quantum gases and single trapped ions can be advantageously combined into one hybrid system, by exploring the immersion of a single trapped ion into a Bose–Einstein condensate of neutral atoms.

The role of electronic excitation in cold atom-ion chemistry

The role of electronic excitation in charge exchange chemical reactions between ultracold Ca atoms and Ba + ions, confined in a hybrid trap, is studied. This prototypical system is energetically

Kinetics of a single trapped ion in an ultracold buffer gas

The immersion of a single ion confined by a radiofrequency (RF) trap in an ultracold atomic gas extends the concept of buffer gas cooling to a new temperature regime. The steady-state energy

Ultracold photoassociation spectroscopy: Long-range molecules and atomic scattering

Photoassociation is the process in which two colliding atoms absorb a photon to form an excited molecule. The development of laser-cooling techniques for producing gases at ultracold !!1 mK"

Measurement of a large chemical reaction rate between ultracold closed-shell 40Ca atoms and open-shell 174Yb+ ions held in a hybrid atom-ion trap.

The structure of the CaYb+ molecule is determined and used in a calculation that explains the fast chemical reaction as a consequence of strong radiative charge transfer.

Sympathetic and swap cooling of trapped ions by cold atoms in a MOT

A mixed system of cooled and trapped, ions and atoms, paves the way for ion assisted cold chemistry and novel many body studies. Due to the different individual trapping mechanisms, trapped atoms are

Ion-neutral chemical reactions between ultracold localized ions and neutral molecules with single-particle resolution

Chemical reactions between ultracold $^{9}\mathrm{Be}^{+}$ ions and room-temperature molecular hydrogen isotopomers and between ultracold ${\mathrm{H}}_{3}^{+}$ ions and room-temperature

Cold heteronuclear atom-ion collisions.

Cold heteronuclear atom-ion collisions are studied by immersing a trapped single ion into an ultracold atomic cloud and measuring the energy-dependent reaction rate constants, revealing the branching ratio between radiative and nonradiative charge exchange processes.

Role of electronic excitations in ground-state-forbidden inelastic collisions between ultracold atoms and ions.

It is experimentally demonstrated that it is possible to mitigate inelastic collision loss mechanisms in these systems, marking an important step toward long-lived hybrid atom-ion devices.

Radiative charge-transfer lifetime of the excited state of ( NaCa ) +

New experiments were proposed recently to investigate the regime of cold atomic and molecular ion-atom collision processes in a special hybrid neutral-atom-ion trap under high-vacuum conditions. We