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

Journal Article · · Journal of Physics. B, Atomic, Molecular and Optical Physics
 [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

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1361301
Journal Information:
Journal of Physics. B, Atomic, Molecular and Optical Physics, Vol. 50, Issue 7; ISSN 0953-4075
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English