002739403 001__ 2739403
002739403 003__ SzGeCERN
002739403 005__ 20201003221041.0
002739403 0247_ $$2DOI$$a10.1038/s41598-020-68218-5
002739403 0248_ $$aoai:inspirehep.net:1820694$$pcerncds:CERN:FULLTEXT$$pcerncds:FULLTEXT$$pcerncds:CERN$$qINSPIRE:HEP$$qForCDS
002739403 035__ $$9http://old.inspirehep.net/oai2d$$aoai:inspirehep.net:1820694$$d2020-10-02T09:07:43Z$$h2020-10-03T04:00:13Z$$mmarcxml
002739403 035__ $$9Inspire$$a1820694
002739403 041__ $$aeng
002739403 100__ $$aVernon, A R$$uLeuven U.
002739403 245__ $$9submitter$$aLaser spectroscopy of indium Rydberg atom bunches by electric field ionization
002739403 260__ $$c2020
002739403 300__ $$a18 p
002739403 520__ $$9submitter$$aThis work reports on the application of a novel electric field-ionization setup for high-resolution laser spectroscopy measurements on bunched fast atomic beams in a collinear geometry. In combination with multi-step resonant excitation to Rydberg states using pulsed lasers, the field ionization technique demonstrates increased sensitivity for isotope separation and measurement of atomic parameters over previous non-resonant laser ionization methods. The setup was tested at the Collinear Resonance Ionization Spectroscopy experiment at ISOLDE-CERN to perform high-resolution measurements of transitions in the indium atom from the 5s$^2$5d$^2$D$_{5/2}$ and 5s$^2$5d$^2$D$_{3/2}$ states to 5s$^2n$p$^2$P and 5s$^2n$f$^2$F Rydberg states, up to a principal quantum number of n=72. The extracted Rydberg level energies were used to re-evaluate the ionization potential of the indium atom to be 46,670.107(4)cm$^{−1}$. The nuclear magnetic dipole and nuclear electric quadrupole hyperfine structure constants and level isotope shifts of the 5s$^2$5d$^2$D$_{5/2}$ and 5s$^2$5d$^2$D$_{3/2}$ states were determined for $^{113,115}$In. The results are compared to calculations using relativistic coupled-cluster theory. A good agreement is found with the ionization potential and isotope shifts, while disagreement of hyperfine structure constants indicates an increased importance of electron correlations in these excited atomic states. With the aim of further increasing the detection sensitivity for measurements on exotic isotopes, a systematic study of the field-ionization arrangement implemented in the work was performed at the same time and an improved design was simulated and is presented. The improved design offers increased background suppression independent of the distance from field ionization to ion detection.
002739403 540__ $$aCC-BY-4.0$$uhttp://creativecommons.org/licenses/by/4.0/
002739403 542__ $$f© The Author(s) 2020
002739403 65017 $$2SzGeCERN$$aNuclear Physics - Experiment
002739403 690C_ $$aCERN
002739403 693__ $$eCERN ISOLDE
002739403 700__ $$aRicketts, C M$$uManchester U.
002739403 700__ $$aBillowes, J$$uManchester U.
002739403 700__ $$aCocolios, T E$$uLeuven U.
002739403 700__ $$aCooper, B S$$uManchester U.$$uU. Manchester (main)$$vPhoton Science Institute, Alan Turing Building, University of Manchester, Manchester M13 9PY, UK.
002739403 700__ $$aFlanagan, K T$$uManchester U.$$uU. Manchester (main)$$vPhoton Science Institute, Alan Turing Building, University of Manchester, Manchester M13 9PY, UK.
002739403 700__ $$aRuiz, R F Garcia$$uCERN$$uMIT$$vMassachusetts Institute of Technology, Cambridge, MA 02139, USA.
002739403 700__ $$aP Gustafsson, F$$uLeuven U.
002739403 700__ $$aNeyens, G$$uLeuven U.$$uCERN$$vEP Department, CERN, 1211 Geneva 23, Switzerland.
002739403 700__ $$aPerrett, H A$$uManchester U.
002739403 700__ $$aSahoo, B K$$uAhmedabad U.
002739403 700__ $$aWang, Q$$uLanzhou U. (main)
002739403 700__ $$aWaso, F J$$uStellenbosch U.
002739403 700__ $$aF Yang, X$$uPeking U.$$uPeking U., SKLNPT
002739403 773__ $$c12306$$n1$$pSci. Rep.$$v10$$y2020
002739403 8564_ $$82250896$$s4332493$$uhttp://cds.cern.ch/record/2739403/files/s41598-020-68218-5 (1).pdf$$yFulltext
002739403 960__ $$a13
002739403 980__ $$aARTICLE