H. A. Klein

1.5k citations

51 papers · 997 · h-index 17

Impact in

Atomic and Molecular Physics, and Optics top 2%
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Fiber Laser Technologies
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
Statistics, Probability and Uncertainty top 1%
- Scientific Measurement and Uncertainty Evaluation

Papers in

Atomic and Molecular Physics, and Optics 48
- Advanced Frequency and Time Standards 34
- Cold Atom Physics and Bose-Einstein Condensates 23
- Advanced Fiber Laser Technologies 14
- Atomic and Molecular Physics 13
- Atomic and Subatomic Physics Research 9
- Advanced Chemical Physics Studies 4
Statistics, Probability and Uncertainty 13
- Scientific Measurement and Uncertainty Evaluation 13

Co-authors: P. Gill (34 shared papers)Guozheng Huang (24 shared papers)G. P. Barwood (22 shared papers)H. S. Margolis (13 shared papers)G. P. Barwood (11 shared papers)W. R. C. Rowley (12 shared papers)S.N. Lea (11 shared papers)K. Szymaniec (4 shared papers)
Journals: Physical Review A (5 papers)Physical Review Letters (4 papers)Measurement Science and Technology (3 papers)IEEE Transactions on Instrumentation and Measurement (3 papers)Review of Scientific Instruments (2 papers)
Partner nations: United Kingdom Germany China

In The Last Decade

H. A. Klein

45 papers receiving 947 citations

Peers

Countries citing papers authored by H. A. Klein

Since Specialization

Citations

This map shows the geographic impact of H. A. Klein's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by H. A. Klein with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites H. A. Klein more than expected).

Fields of papers citing papers by H. A. Klein

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by H. A. Klein. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by H. A. Klein. The network helps show where H. A. Klein may publish in the future.

Co-authors

The 25 scholars most cited alongside H. A. Klein, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with H. A. Klein Line = papers co-authored together H. A. Klein links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

Showing the 20 most-cited of 51 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	Hertz-Level Measurement of the Optical Clock Frequency in a Single ⁸⁸ Sr ⁺ Ion Science ·H. S. Margolis, G. P. Barwood, Guozheng Huang, H. A. Klein, S.N. Lea, K. Szymaniec, P. Gill	2004	223
2	Observation of an Electric Octupole Transition in a Single Ion Physical Review Letters ·M. W. Roberts, Paul C.J. Taylor, G. P. Barwood, P. Gill, H. A. Klein, W. R. C. Rowley	1997	99
3	Measurement of the Electric Quadrupole Moment of the4d D5/22Level inSr+88 Physical Review Letters ·G. P. Barwood, H. S. Margolis, Guozheng Huang, P. Gill, H. A. Klein	2004	64
4	Laser cooling of trapped ytterbium ions using a four-level optical-excitation scheme Physical Review A ·A.S. Bell, P. Gill, H. A. Klein, A. P. Levick, Chr. Tamm, D. Schnier	1991	62
5	Agreement between two88Sr+optical clocks to 4 parts in 1017 Physical Review A ·G. P. Barwood, Guozheng Huang, H. A. Klein, L. A. M. Johnson, S. A. King, H. S. Margolis, K. Szymaniec, P. Gill	2014	55
6	Absolute frequency measurement of the 674-nm88Sr+clock transition using a femtosecond optical frequency comb Physical Review A ·H. S. Margolis, Guozheng Huang, G. P. Barwood, S.N. Lea, H. A. Klein, W. R. C. Rowley, P. Gill, Robert S. Windeler	2003	54
7	Laser-InducedM1Resonance Spectroscopy of the1s2pP13−P23Fine Structure ofF7+19 Physical Review Letters ·E. G. Myers, P. Kuske, H. J. Andrä, I. A. Armour, N.A. Jelley, H. A. Klein, J. D. Silver, E. Träbert	1981	42
8	Trapped ion optical frequency standards Measurement Science and Technology ·P. Gill, G. P. Barwood, H. A. Klein, Guozheng Huang, S. A. Webster, Peter Blythe, Kazumoto Hosaka, S.N. Lea, H. S. Margolis	2003	35
9	Observation of the 5s^2S_1/2−4d^2D_5/2 transition in a single laser-cooled trapped Sr^+ ion by using an all-solid-state system of lasers Optics Letters ·G. P. Barwood, Christopher S. Edwards, P. Gill, H. A. Klein, W. R. C. Rowley	1993	35
10	Sub-kHz “clock” transition linewidths in a cold trapped 88Sr+ ion in low magnetic fields using 1092-nm polarisation switching Optics Communications ·G. P. Barwood, P. Gill, Guozheng Huang, H. A. Klein, W. R. C. Rowley	1998	28
11	Subkilohertz comparison of the single-ion optical-clock2S1/2−2D5/2transition in two88Sr+traps Physical Review A ·G. P. Barwood, Guozheng Huang, H. A. Klein, P. Gill, Roger B. M. Clarke	1999	24
12	Finestructure transitions in doubly excited three-electron Mg9+ Physics Letters A ·E. Träbert, H. Hellmann, P. H. Heckmann, S. Bashkin, H. A. Klein, J. D. Silver	1982	21
13	Automatic laser control for a⁸⁸Sr⁺optical frequency standard Measurement Science and Technology ·G. P. Barwood, P. Gill, Guozheng Huang, H. A. Klein	2012	21
14	Clearly resolved secular sidebands on the /sup 2/S/sub 1/2/-/sup 2/D/sub 5/2/ 674-nm clock transition in a single trapped Sr/sup +/ ion IEEE Transactions on Instrumentation and Measurement ·G. P. Barwood, P. Gill, H. A. Klein, W. R. C. Rowley	1997	19
15	Measurement of the2S1/2−2D5/2411-nm interval in laser-cooled trappedYb+172ions Physical Review A ·P. Gill, H. A. Klein, A. P. Levick, M. W. Roberts, W. R. C. Rowley, Paul C.J. Taylor	1995	19
16	Beam-foil measurements of the 1s2s³S₁-1s2p³P_2,1,0transitions in helium-like F⁷⁺, Mg¹⁰⁺and Al¹¹⁺ Journal of Physics B Atomic and Molecular Physics ·H. A. Klein, F. Moscatelli, E. G. Myers, E. H. Pinnington, J. D. Silver, E. Träbert	1985	19
17	Observation of a Sub-10-Hz Linewidth $^{88}\hbox{Sr}^{+ \ \ 2}\hbox{S}_{1/2}$–$^{2}\hbox{D}_{5/2}$ Clock Transition at 674 nm IEEE Transactions on Instrumentation and Measurement ·G. P. Barwood, P. Gill, Guilong Huang, H. A. Klein	2007	16
18	Compact laser system for a laser-cooled ytterbium ion microwave frequency standard Review of Scientific Instruments ·Sean Mulholland, H. A. Klein, G. P. Barwood, S. Donnellan, Peter B. R. Nisbet-Jones, Guozheng Huang, Gregory S. Walsh, P. E. G. Baird, P. Gill	2019	14
19	Studies of 1s2s 3S-1s2p 3P transitions in helium-like Ne8+ recoil ions using photographic spectroscopy Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms ·J. Steven Brown, Cyril Band, E.C. Finch, R.A. Holt, H. A. Klein, J. Laursen, A.F. McClelland, N J Peacock, J. D. Silver, M. Stamp, J. Takács	1985	14
20	Precision interferometric frequency measurement of the 674 nm /sup 2/S/sub 1/2/-/sup 2/D/sub 5/2/ transition in a single cold Sr/sup +/ ion IEEE Transactions on Instrumentation and Measurement ·G. P. Barwood, Christopher S. Edwards, P. Gill, Guozheng Huang, H. A. Klein, W. R. C. Rowley	1995	12

About H. A. Klein

H. A. Klein is a scholar working on Atomic and Molecular Physics, and Optics, Statistics, Probability and Uncertainty, Spectroscopy, Electrical and Electronic Engineering and Mechanics of Materials, having authored 51 papers that have together received 997 indexed citations. Recurring topics across this work include Advanced Frequency and Time Standards (34 papers), Cold Atom Physics and Bose-Einstein Condensates (23 papers), Advanced Fiber Laser Technologies (14 papers), Atomic and Molecular Physics (13 papers), Scientific Measurement and Uncertainty Evaluation (13 papers), Atomic and Subatomic Physics Research (9 papers), Spectroscopy and Laser Applications (9 papers) and Advanced Chemical Physics Studies (4 papers). The work is most often cited by research in Atomic and Molecular Physics, and Optics (970 citations), Statistics, Probability and Uncertainty (180 citations), Spectroscopy (217 citations), Radiation (22 citations) and Nuclear and High Energy Physics (33 citations). H. A. Klein has collaborated with scholars based in United Kingdom, Germany and China. Frequent co-authors include P. Gill, Guozheng Huang, G. P. Barwood, H. S. Margolis, G. P. Barwood, W. R. C. Rowley, S.N. Lea, K. Szymaniec, M. W. Roberts and Paul C.J. Taylor. Their work appears in journals such as Physical Review A, Physical Review Letters, Measurement Science and Technology, IEEE Transactions on Instrumentation and Measurement and Review of Scientific Instruments.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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