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

被引：30

作者：

Kessler, T. ^{[1
]}

Brueck, K. ^{[1
]}

Baktash, C. ^{[2
]}

Beene, J. R. ^{[2
]}

Geppert, Ch ^{[1
]}

Havener, C. C. ^{[2
]}

Krause, H. F. ^{[2
]}

Liu, Y. ^{[2
]}

Schultz, D. R. ^{[2
]}

Stracener, D. W. ^{[2
]}

Vane, C. R. ^{[2
]}

Wendt, K. ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany

[2] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2007年 / 40卷 / 23期

关键词：

D O I：

10.1088/0953-4075/40/23/002

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页码：4413 / 4432

页数：20

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