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Title: Resonant ionization spectroscopy of autoionizing Rydberg states in cobalt and redetermination of its ionization potential

We obtained multi-step resonance ionization spectroscopy of cobalt using a hot-cavity laser ion source and three Ti:Sapphire lasers. Furthermore, the photoionization spectra revealed members of five new autoionizing Rydberg series that originate from three different lower levels of 3d 74s5s h 4F 9/2, 3d 74s4d f 4G 11/2, and 3d 74s4d f 4H 13/2 and converge to the first four excited states of singly ionized Co. Our analyses of the Rydberg series yield 63564.689 0.036 cm -1 as the first ionization potential of Co, which is an order of magnitude more accurate than the previous estimation. Using a three-step resonance ionization scheme that employs an autoinizing Rydberg state in the last transition, we obtained an overall ionization efficiency of about 18% for Co.
Authors:
 [1] ;  [2] ;  [2] ;  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physic Division
  2. Johannes Gutenberg Univ., Mainz (Germany). Inst for Physics
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. B, Atomic, Molecular and Optical Physics
Additional Journal Information:
Journal Volume: 50; Journal Issue: 7; Journal ID: ISSN 0953-4075
Publisher:
IOP Publishing
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Holifield Radioactive Ion Beam Facility (HRIBF)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; resonant ionization; cobalt; Ti:sapphire laser; laser ion source; Rydberg state; autoionizing
OSTI Identifier:
1361301

Liu, Yuan, Gottwald, T., Mattolat, C., and Wendt, K.. Resonant ionization spectroscopy of autoionizing Rydberg states in cobalt and redetermination of its ionization potential. United States: N. p., Web. doi:10.1088/1361-6455/aa58d0.
Liu, Yuan, Gottwald, T., Mattolat, C., & Wendt, K.. Resonant ionization spectroscopy of autoionizing Rydberg states in cobalt and redetermination of its ionization potential. United States. doi:10.1088/1361-6455/aa58d0.
Liu, Yuan, Gottwald, T., Mattolat, C., and Wendt, K.. 2017. "Resonant ionization spectroscopy of autoionizing Rydberg states in cobalt and redetermination of its ionization potential". United States. doi:10.1088/1361-6455/aa58d0. https://www.osti.gov/servlets/purl/1361301.
@article{osti_1361301,
title = {Resonant ionization spectroscopy of autoionizing Rydberg states in cobalt and redetermination of its ionization potential},
author = {Liu, Yuan and Gottwald, T. and Mattolat, C. and Wendt, K.},
abstractNote = {We obtained multi-step resonance ionization spectroscopy of cobalt using a hot-cavity laser ion source and three Ti:Sapphire lasers. Furthermore, the photoionization spectra revealed members of five new autoionizing Rydberg series that originate from three different lower levels of 3d74s5s h4F9/2, 3d74s4d f4G11/2, and 3d74s4d f4H13/2 and converge to the first four excited states of singly ionized Co. Our analyses of the Rydberg series yield 63564.689 0.036 cm-1 as the first ionization potential of Co, which is an order of magnitude more accurate than the previous estimation. Using a three-step resonance ionization scheme that employs an autoinizing Rydberg state in the last transition, we obtained an overall ionization efficiency of about 18% for Co.},
doi = {10.1088/1361-6455/aa58d0},
journal = {Journal of Physics. B, Atomic, Molecular and Optical Physics},
number = 7,
volume = 50,
place = {United States},
year = {2017},
month = {3}
}