eprintid: 22096
rev_number: 16
eprint_status: archive
userid: 2813
dir: disk0/00/02/20/96
datestamp: 2016-12-16 10:48:18
lastmod: 2017-01-16 11:10:14
status_changed: 2016-12-16 10:48:18
type: doctoralThesis
metadata_visibility: show
creators_name: Höltkemeier, Bastian
title: Sympathetic Cooling of Ions in a Hybrid Atom Ion Trap
subjects: 500
subjects: 530
divisions: 130200
adv_faculty: af-13
abstract: In this thesis the dynamics of a trapped ion immersed in
a spatially localized buffer gas is investigated. For a homogeneous buffer gas, the ion’s energy distribution reaches a stable equilibrium only if the mass of the buffer gas atoms is below a critical value. This limitation can be overcome by using multipole traps in combination and/or a spatially confined buffer gas. Using a generalized model
for elastic collisions of the ion with the buffer gas atoms, the ion’s energy distribution is numerically determined for arbitrary buffer gas distributions and trap parameters. Three regimes characterized by the respective analytic form of the ion’s equilibrium energy distribution
are found. One of these is a novel regime at large atom-to-ion mass ratios where the final ion temperature can tuned by adiabatically decreasing the spatial extension of the buffer gas and the effective ion trap depth (forced sympathetic cooling). The second part of the thesis presents a hybrid atom ion trap designed for sympathetic cooling of hydroxide anions. In this hybrid trap the anions are immersed in a cloud of laser cooled rubidium atoms. The translational and rovibrational temperatures of the anions is probed by photodetachment tomography and spectroscopy which shows the first ever indication of sympathetic cooling of anions by laser cooled atoms.
date: 2016
id_scheme: DOI
id_number: 10.11588/heidok.00022096
ppn_swb: 1655344013
own_urn: urn:nbn:de:bsz:16-heidok-220963
date_accepted: 2016-10-27
advisor: HASH(0x564e1c5aea10)
language: eng
bibsort: HOLTKEMEIESYMPATHETI2016
full_text_status: public
citation:   Höltkemeier, Bastian  (2016) Sympathetic Cooling of Ions in a Hybrid Atom Ion Trap.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/22096/1/2016_Hoeltkemeier_Dissertation_Final.pdf