U. Öpik

2.3k citations

21 papers · 2.0k · 2 hit papers · h-index 12

Impact in

Atomic and Molecular Physics, and Optics top 2%
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Spectroscopy and Quantum Chemical Studies
Electronic, Optical and Magnetic Materials top 5%
- Crystal Structures and Properties
- Magnetism in coordination complexes

Papers in

Atomic and Molecular Physics, and Optics 20
- Advanced Chemical Physics Studies 12
- Atomic and Molecular Physics 12
Spectroscopy 5
- Mass Spectrometry Techniques and Applications 3

Co-authors: M. H. L. Pryce (2 shared papers)R. A. Sack (1 shared paper)Hugh Christopher Longuet-Higgins (1 shared paper)R. F. Wood (3 shared papers)D. R. Bates (2 shared papers)M. R. Flannery (1 shared paper)G. Poots (1 shared paper)T.H. Thomas (1 shared paper)
Journals: Molecular Physics (2 papers)Computer Physics Communications (1 paper)Solid State Communications (1 paper)Proceedings of the Physical Society Section A (2 papers)Proceedings of the Royal Society of London A Mathematical and Physical Sciences (2 papers)
Partner nations: United Kingdom United States

In The Last Decade

U. Öpik

20 papers receiving 1.9k citations

U. Öpik's Hit Papers

align trajectories log scale

Studies of the Jahn-Teller effect .II. The dynamical problem 1958 · 785 citations

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if any of the following hold:

it has ≥500 total citations;
it reaches ≥1.5× the top-1% citation threshold for papers in the same subfield and year (the threshold is the minimum needed to enter the top 1%, not the average within it);
it reaches the top citation threshold in at least one of its specific research topics.

1958 Proceedings of the Royal Society of London A Mathematical and Physical Sciences
1957 Proceedings of the Royal Society of London A Mathematical and Physical Sciences

Peers

Countries citing papers authored by U. Öpik

Since Specialization

Citations

This map shows the geographic impact of U. Öpik'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 U. Öpik with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites U. Öpik more than expected).

Fields of papers citing papers by U. Öpik

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by U. Öpik. 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 U. Öpik. The network helps show where U. Öpik may publish in the future.

Co-authors

The 9 scholars most cited alongside U. Öpik, 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 U. Öpik Line = papers co-authored together U. Öpik 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 21 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	Studies of the Jahn-Teller effect .II. The dynamical problem Proceedings of the Royal Society of London A Mathematical and Physical Sciences ·Hugh Christopher Longuet-Higgins, U. Öpik, M. H. L. Pryce, R. A. Sack Hit paper breakdown →	1958	785
2	Studies of the Jahn-Teller effect. I. A survey of the static problem Proceedings of the Royal Society of London A Mathematical and Physical Sciences ·U. Öpik, M. H. L. Pryce Hit paper breakdown →	1957	673
3	Point Defects in Ionic Crystals. II. TheFCenter in KCl, KBr, KI, and NaCl Physical Review ·R. F. Wood, U. Öpik	1969	87
4	The polarization of a closed-shell core of an atomic system by an outer electron I. A correction to the adiabatic approximation Proceedings of the Physical Society ·H Eissa, U. Öpik	1967	63
5	The polarization of a closed-shell core of an atomic system by an outer electron II. Evaluation of the polarizabilities from observed spectra Proceedings of the Physical Society ·U. Öpik	1967	55
6	The photoionization of the hydrogen molecule from the ground electronic and vibrational state Proceedings of the Physical Society ·M. R. Flannery, U. Öpik	1965	55
7	Properties of the Hydrogen Molecular Ion II: Photo-Ionization from the 1s _g, 2s _gand 3s _gStates Proceedings of the Physical Society Section A ·D. R. Bates, U. Öpik, G. Poots	1953	51
8	A simplified hartree-fock procedure for atoms with two electrons outside closed shells Proceedings of the Physical Society ·C.D.H. Chisholm, U. Öpik	1964	49
9	Undulations in the photoionization cross section curves of molecules Journal of Physics B Atomic and Molecular Physics ·D. R. Bates, U. Öpik	1968	47
10	Point Defects in Ionic Crystals. I. Methods of Calculating the Electronic Structure Physical Review ·U. Öpik, R. F. Wood	1969	41
11	Electronic Structure of theUCenter. I. Optical Absorption and Lattice Relaxation Physical Review ·R. F. Wood, U. Öpik	1967	22
12	An impact-parameter method for heavy-particle collisions involving one electron. I. Theory and sample results on H⁺-H and He²⁺-H collisions Journal of Physics B Atomic and Molecular Physics ·H G Morrison, U. Öpik	1978	13
13	A simple method for calculating van der Waals interactions Proceedings of the Physical Society ·U. Öpik	1967	11
14	Mean energies of hybridized valence states Molecular Physics ·U. Öpik	1961	10
15	The interpretation of the energies of the 2D states of the lithium atom in terms of the polarization of the core by the outer electron Journal of Physics B Atomic and Molecular Physics ·U. Öpik	1969	7
16	Excitation and charge transfer to the 2s and 2p states in H⁺-H collisions in the energy range 49 to 125 keV Journal of Physics B Atomic and Molecular Physics ·H G Morrison, U. Öpik	1979	6
17	An application of the Pariser-Parr approximation to the nitrogen molecule Molecular Physics ·U. Öpik, T.H. Thomas	1966	4
18	Variational calculations on a substitutional Ca+ impurity in the sodium chloride lattice Solid State Communications ·C. Laughlin, U. Öpik	1964	2
19	An impact-parameter method for heavy-particle collisions involving one electron. II. Attempts to improve the accuracy, and results on He²⁺-H collisions Journal of Physics B Atomic and Molecular Physics ·H G Morrison, U. Öpik	1984	1
20	The Layzer Approximation for the Treatment of Collisions of Electrons with Atoms Proceedings of the Physical Society Section A ·U. Öpik	1955	1

About U. Öpik

U. Öpik is a scholar working on Atomic and Molecular Physics, and Optics, Spectroscopy, Electrical and Electronic Engineering, Physical and Theoretical Chemistry and Radiation, having authored 21 papers that have together received 2.0k indexed citations. Recurring topics across this work include Advanced Chemical Physics Studies (12 papers), Atomic and Molecular Physics (12 papers), Advanced Physical and Chemical Molecular Interactions (4 papers), Molecular Junctions and Nanostructures (4 papers), Mass Spectrometry Techniques and Applications (3 papers), Electron and X-Ray Spectroscopy Techniques (2 papers), X-ray Spectroscopy and Fluorescence Analysis (2 papers) and Nuclear physics research studies (2 papers). The work is most often cited by research in Atomic and Molecular Physics, and Optics (1.4k citations), Electronic, Optical and Magnetic Materials (478 citations), Inorganic Chemistry (344 citations), Physical and Theoretical Chemistry (187 citations) and Condensed Matter Physics (222 citations). U. Öpik has collaborated with scholars based in United Kingdom and United States. Frequent co-authors include M. H. L. Pryce, R. A. Sack, Hugh Christopher Longuet-Higgins, R. F. Wood, D. R. Bates, M. R. Flannery, G. Poots, T.H. Thomas and C. Laughlin. Their work appears in journals such as Molecular Physics, Computer Physics Communications, Solid State Communications, Proceedings of the Physical Society Section A and Proceedings of the Royal Society of London A Mathematical and Physical Sciences.

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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U. Öpik's Hit Papers

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