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

作者：Liu Y^*; Gottwald T; Mattolat C; Wendt K

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2017, 50(7): 075002.

DOI：10.1088/1361-6455/aa58d0

• resonant ionization
• cobalt
• Ti:sapphire laser
• laser ion source
• Rydberg state
• autoionizing

Multi-step resonance ionization spectroscopy of cobalt has been performed using a hot-cavity laser ion source and three Ti:Sapphire lasers. The photoionization spectra revealed members of five new autoionizing Rydberg series that originate from three different lower levels of 3d(7)4s5s h(4)F(9/2), 3d(7)4s4d f(4)G(11/2), and 3d(7)4s4d f(4)H(13/2) and converge to the first four excited states of singly ionized Co. The analyses of the Rydberg series yield 63 564.689 +/- 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.

• 出版日期2017-4-14