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AuthorKrükow, Artjomdc.contributor.author
Date of accession2017-05-24T15:29:46Zdc.date.accessioned
Available in OPARU since2017-05-24T15:29:46Zdc.date.available
Year of creation2016dc.date.created
Date of first publication2017-05-24dc.date.issued
AbstractOver the recent years a new research field emerged that combines technologies for cooling and trapping of neutral atoms and charged ions in one experimental apparatus. These atom-ion hybrid traps enable the investigation of atom-ion interactions at unprecedentedly low collision energies targeting the ultracold s-wave regime. In this thesis I report on experiments performed in an hybrid atom-ion apparatus combining single Ba^+ or Rb^+ ions with ultracold neutral Rb atoms. The main focus of this work is studying the emerging three-body reaction dynamics in a cold charged gas. First, I will present measurements investigating cold reactions in the hetero-nuclear Ba^+ - Rb system. So far, most theoretical and experimental studies have been dealing with reactions between two particles. However, we find that three-body reactions already dominate over two-body ones at atomic densities down to 10^{−11} cm^{−3} once collision energies are in the low mK regime. We then investigate the energy scaling of inelastic ternary collisions between an ion and two atoms. A power-law scaling of the three-body rate coefficient is predicted by theory. We find agreement with the experiment if we include the ion’s kinetic energy distribution that we access numerically. The next study elaborates on the very first observation of ternary reactions in a hybrid cold atom-ion setup. For this we immerse a single Rb^+ ion into ultracold Rb atoms with sufficiently reduced excess micromotion. Occurring reactions are signaled by the creation of highly energetic Rb^+ ions. I will also showcase novel techniques to investigate the atom and the ion system by using the respective other one which were developed by us over the course of the last years. In order to reduce the total ion kinetic energy in a Paul trap one has to compensate the ion’s excess micromotion. This is routinely being done by analyzing the ion’s fluorescence. By observing collision energy dependent elastic atom-ion collisions in an ultracold atom cloud we directly infer the ion’s micromotion energy. This way we can perform atom-ion experiments with optically dark Rb^+ ions and good excess micromotion. Without the need of visible laser light for micromotion compensation we are able to investigate the evolution of quasi-static stray electric fields in a Paul trap over a period of several months. The last study I will present is targeted at neutral Rb only. There, we spectroscopically access the molecular state distribution of Rb_2 molecules formed in neutral three-body recombination by state-selective ionization of these molecules. Trapping and subsequent detection of these ions is being done with our Paul trap, which has the role of a very sensitive single ion detector in these measurements.dc.description.abstract
Languageendc.language.iso
PublisherUniversität Ulmdc.publisher
Has part10.1103/PhysRevA.94.030701dc.relation.haspart
Has part10.1103/PhysRevLett.116.193201dc.relation.haspart
Has part10.1103/PhysRevLett.109.123201dc.relation.haspart
Has part10.1063/1.4809578dc.relation.haspart
Has part10.1007/s00340-013-5688-7dc.relation.haspart
Has part10.1038/NPHYS2661dc.relation.haspart
LicenseStandarddc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v3dc.rights.uri
Dewey Decimal GroupDDC 530 / Physicsdc.subject.ddc
LCSHIon-atom collisionsdc.subject.lcsh
TitleThree-body reaction dynamics in cold atom-ion experimentsdc.title
Resource typeDissertationdc.type
Date of acceptance2017-03-31dcterms.dateAccepted
RefereeHecker Denschlag, Johannesdc.contributor.referee
RefereeCalarco, Tommasodc.contributor.referee
DOIhttp://dx.doi.org/10.18725/OPARU-4354dc.identifier.doi
PPN1659141699dc.identifier.ppn
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-oparu-4393-0dc.identifier.urn
GNDIon-Atom-Wechselwirkungdc.subject.gnd
GNDIon-Atom-Stoßdc.subject.gnd
FacultyFakultät für Naturwissenschaftenuulm.affiliationGeneral
InstitutionInstitut für Quantenmaterieuulm.affiliationSpecific
InstitutionInstitut für Komplexe Quantensystemeuulm.affiliationSpecific
Shelfmark print versionW: W-H 15.118uulm.shelfmark
Grantor of degreeFakultät für Naturwissenschaftenuulm.thesisGrantor
DCMI TypeTextuulm.typeDCMI
TypeErstveröffentlichunguulm.veroeffentlichung
CategoryPublikationenuulm.category
Bibliographyuulmuulm.bibliographie


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