Three-step resonant photoionization spectroscopy of Ni and Ge: Ionization potential and odd-parity Rydberg levels

T. Kessler; K. Brück; C. Baktash; J. R. Beene; Ch Geppert; C. C. Havener; H. F. Krause; Y. Liu; D. R. Schultz; D. W. Stracener; C. R. Vane; K. Wendt

doi:10.1088/0953-4075/40/23/002

Three-step resonant photoionization spectroscopy of Ni and Ge: Ionization potential and odd-parity Rydberg levels

T. Kessler, K. Brück, C. Baktash, J. R. Beene, Ch Geppert, C. C. Havener, H. F. Krause, Y. Liu, D. R. Schultz, D. W. Stracener, C. R. Vane, K. Wendt

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Abstract

In preparation of a laser ion source, we have investigated multi-step laser ionization via Rydberg and autoionizing states for atomic Ni and Ge using a mass separator with an ion beam energy of 20 keV. For both elements resonant three-step excitation schemes suitable for modern Ti:sapphire laser systems were developed. Rydberg series in the range of principal quantum numbers 20 ≤ n ≤ 80 were localized, assigned and quantum numbers were allocated to the individual resonances. Ionization potentials (IP) were extracted from fits of the individual series and quantum defects of individual levels were analysed for confirmation of series assignment. For Ni the ionization potential could be extracted with significantly increased precision compared to literature with a value of E_IP (Ni) = 61 619.77(14) cm^-1. Also, at least one notable autoionizing state above the first IP was discovered for both elements, and the different ionization schemes via Rydberg or autoionizing states were compared with respect to line shape, ionization efficiency and selectivity.

Original language	English
Pages (from-to)	4413-4432
Number of pages	20
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Volume	40
Issue number	23
DOIs	https://doi.org/10.1088/0953-4075/40/23/002
State	Published - Oct 14 2007

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Kessler, T., Brück, K., Baktash, C., Beene, J. R., Geppert, C., Havener, C. C., Krause, H. F., Liu, Y., Schultz, D. R., Stracener, D. W., Vane, C. R., & Wendt, K. (2007). Three-step resonant photoionization spectroscopy of Ni and Ge: Ionization potential and odd-parity Rydberg levels. Journal of Physics B: Atomic, Molecular and Optical Physics, 40(23), 4413-4432. https://doi.org/10.1088/0953-4075/40/23/002

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title = "Three-step resonant photoionization spectroscopy of Ni and Ge: Ionization potential and odd-parity Rydberg levels",

abstract = "In preparation of a laser ion source, we have investigated multi-step laser ionization via Rydberg and autoionizing states for atomic Ni and Ge using a mass separator with an ion beam energy of 20 keV. For both elements resonant three-step excitation schemes suitable for modern Ti:sapphire laser systems were developed. Rydberg series in the range of principal quantum numbers 20 ≤ n ≤ 80 were localized, assigned and quantum numbers were allocated to the individual resonances. Ionization potentials (IP) were extracted from fits of the individual series and quantum defects of individual levels were analysed for confirmation of series assignment. For Ni the ionization potential could be extracted with significantly increased precision compared to literature with a value of EIP (Ni) = 61 619.77(14) cm-1. Also, at least one notable autoionizing state above the first IP was discovered for both elements, and the different ionization schemes via Rydberg or autoionizing states were compared with respect to line shape, ionization efficiency and selectivity.",

author = "T. Kessler and K. Br{\"u}ck and C. Baktash and Beene, {J. R.} and Ch Geppert and Havener, {C. C.} and Krause, {H. F.} and Y. Liu and Schultz, {D. R.} and Stracener, {D. W.} and Vane, {C. R.} and K. Wendt",

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Kessler, T, Brück, K, Baktash, C, Beene, JR, Geppert, C, Havener, CC, Krause, HF, Liu, Y, Schultz, DR, Stracener, DW, Vane, CR & Wendt, K 2007, 'Three-step resonant photoionization spectroscopy of Ni and Ge: Ionization potential and odd-parity Rydberg levels', Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 40, no. 23, pp. 4413-4432. https://doi.org/10.1088/0953-4075/40/23/002

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T1 - Three-step resonant photoionization spectroscopy of Ni and Ge

T2 - Ionization potential and odd-parity Rydberg levels

AU - Kessler, T.

AU - Brück, K.

AU - Baktash, C.

AU - Beene, J. R.

AU - Geppert, Ch

AU - Havener, C. C.

AU - Krause, H. F.

AU - Liu, Y.

AU - Schultz, D. R.

AU - Stracener, D. W.

AU - Vane, C. R.

AU - Wendt, K.

PY - 2007/10/14

Y1 - 2007/10/14

N2 - In preparation of a laser ion source, we have investigated multi-step laser ionization via Rydberg and autoionizing states for atomic Ni and Ge using a mass separator with an ion beam energy of 20 keV. For both elements resonant three-step excitation schemes suitable for modern Ti:sapphire laser systems were developed. Rydberg series in the range of principal quantum numbers 20 ≤ n ≤ 80 were localized, assigned and quantum numbers were allocated to the individual resonances. Ionization potentials (IP) were extracted from fits of the individual series and quantum defects of individual levels were analysed for confirmation of series assignment. For Ni the ionization potential could be extracted with significantly increased precision compared to literature with a value of EIP (Ni) = 61 619.77(14) cm-1. Also, at least one notable autoionizing state above the first IP was discovered for both elements, and the different ionization schemes via Rydberg or autoionizing states were compared with respect to line shape, ionization efficiency and selectivity.

AB - In preparation of a laser ion source, we have investigated multi-step laser ionization via Rydberg and autoionizing states for atomic Ni and Ge using a mass separator with an ion beam energy of 20 keV. For both elements resonant three-step excitation schemes suitable for modern Ti:sapphire laser systems were developed. Rydberg series in the range of principal quantum numbers 20 ≤ n ≤ 80 were localized, assigned and quantum numbers were allocated to the individual resonances. Ionization potentials (IP) were extracted from fits of the individual series and quantum defects of individual levels were analysed for confirmation of series assignment. For Ni the ionization potential could be extracted with significantly increased precision compared to literature with a value of EIP (Ni) = 61 619.77(14) cm-1. Also, at least one notable autoionizing state above the first IP was discovered for both elements, and the different ionization schemes via Rydberg or autoionizing states were compared with respect to line shape, ionization efficiency and selectivity.

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JF - Journal of Physics B: Atomic, Molecular and Optical Physics

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Three-step resonant photoionization spectroscopy of Ni and Ge: Ionization potential and odd-parity Rydberg levels

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