Per‐Olov Löwdin

21.1k total citations · 6 hit papers
115 papers, 12.1k citations indexed

About

Per‐Olov Löwdin is a scholar working on Atomic and Molecular Physics, and Optics, Physical and Theoretical Chemistry and Computational Theory and Mathematics. According to data from OpenAlex, Per‐Olov Löwdin has authored 115 papers receiving a total of 12.1k indexed citations (citations by other indexed papers that have themselves been cited), including 63 papers in Atomic and Molecular Physics, and Optics, 34 papers in Physical and Theoretical Chemistry and 23 papers in Computational Theory and Mathematics. Recurrent topics in Per‐Olov Löwdin's work include Advanced Chemical Physics Studies (26 papers), Matrix Theory and Algorithms (21 papers) and Advanced Physical and Chemical Molecular Interactions (20 papers). Per‐Olov Löwdin is often cited by papers focused on Advanced Chemical Physics Studies (26 papers), Matrix Theory and Algorithms (21 papers) and Advanced Physical and Chemical Molecular Interactions (20 papers). Per‐Olov Löwdin collaborates with scholars based in Sweden, United States and India. Per‐Olov Löwdin's co-authors include Harrison Shull, Jean‐Louis Calais, Klaus E. Appel, Yngve Öhrn, Piotr Froelich, Osvaldo Goscinski, David A. Micha, I. Mayer, John Gruninger and Joseph G. Hoffman and has published in prestigious journals such as The Journal of Chemical Physics, Reviews of Modern Physics and Journal of Applied Physics.

In The Last Decade

Per‐Olov Löwdin

104 papers receiving 11.5k citations

Hit Papers

5 papers align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Quantum Theory of Many-Particle Systems. I. Physical Interpretations by Means of Density Matrices, Natural Spin-Orbitals, and Convergence Problems in the Method of Configurational Interaction

1955 2.8k citations Per‐Olov Löwdin Physical Review profile →
Quantum theory of cohesive properties of solids

1956 956 citations Per‐Olov Löwdin profile →
Quantum Theory of Many-Particle Systems. III. Extension of the Hartree-Fock Scheme to Include Degenerate Systems and Correlation Effects

1955 882 citations Per‐Olov Löwdin Physical Review profile →
A Note on the Quantum-Mechanical Perturbation Theory

1951 727 citations Per‐Olov Löwdin The Journal of Chemical Physics profile →
Natural Orbitals in the Quantum Theory of Two-Electron Systems

1956 524 citations Per‐Olov Löwdin et al. Physical Review profile →
Proton Tunneling in DNA and its Biological Implications

1963 487 citations Per‐Olov Löwdin Reviews of Modern Physics profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Per‐Olov Löwdin Sweden	38	9.2k	2.5k	1.9k	1.9k	1.5k	115	12.1k
Josef Paldus Canada	66	12.7k 1.4×	2.3k 0.9×	3.6k 1.9×	1.8k 0.9×	1.4k 0.9×	300	14.4k
W. von Niessen Germany	50	7.3k 0.8×	2.1k 0.9×	2.2k 1.2×	1.8k 0.9×	534 0.3×	282	9.4k
R. K. Nesbet United States	46	6.8k 0.7×	1.2k 0.5×	1.6k 0.8×	1.1k 0.6×	782 0.5×	199	8.2k
Clemens Roothaan United States	20	6.9k 0.7×	2.1k 0.8×	2.1k 1.1×	1.7k 0.9×	1.4k 0.9×	33	9.8k
R. McWeeny United Kingdom	41	5.4k 0.6×	2.1k 0.9×	1.8k 1.0×	1.6k 0.8×	1.5k 1.0×	93	8.3k
Klaus Ruedenberg United States	55	8.4k 0.9×	3.6k 1.5×	2.5k 1.3×	2.1k 1.1×	896 0.6×	196	11.9k
Poul Jo rgensen Denmark	54	10.1k 1.1×	2.9k 1.2×	4.0k 2.1×	2.1k 1.1×	1.6k 1.0×	111	12.7k
Werner Kutzelnigg Germany	66	12.1k 1.3×	2.5k 1.0×	4.6k 2.4×	2.2k 1.1×	1.3k 0.8×	232	15.9k
Jean‐Paul Malrieu France	48	6.8k 0.7×	1.7k 0.7×	2.1k 1.1×	2.8k 1.5×	2.9k 1.9×	243	10.9k
Hans Jørgen Aa. Jensen Denmark	51	7.1k 0.8×	1.9k 0.8×	2.7k 1.4×	1.6k 0.8×	1.2k 0.8×	161	9.2k

Countries citing papers authored by Per‐Olov Löwdin

Since Specialization

Citations

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

Fields of papers citing papers by Per‐Olov Löwdin

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Per‐Olov Löwdin. 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 Per‐Olov Löwdin. The network helps show where Per‐Olov Löwdin may publish in the future.

Co-authorship network of co-authors of Per‐Olov Löwdin

This figure shows the co-authorship network connecting the top 25 collaborators of Per‐Olov Löwdin. A scholar is included among the top collaborators of Per‐Olov Löwdin based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Per‐Olov Löwdin. Per‐Olov Löwdin is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Löwdin, Per‐Olov. (2003). Fundamental world of quantum chemistry : a tribute to the memory of Per-Olov Löwdin.

Löwdin, Per‐Olov. (1998). Some Comments on the Foundations of Physics. WORLD SCIENTIFIC eBooks. 2 indexed citations

Löwdin, Per‐Olov. (1992). On rotations as special cases of unitary transformations with some applications to the theory of spin. International Journal of Quantum Chemistry. 41(1). 213–242.

Löwdin, Per‐Olov. (1991). Concluding remarks at the second watoc world congress in Toronto, July 8–14, 1991. Journal of Molecular Structure THEOCHEM. 233. 353–355.

Löwdin, Per‐Olov. (1991). On nuclear motion and the definition of molecular structure. Journal of Molecular Structure THEOCHEM. 230. 13–15. 13 indexed citations

Löwdin, Per‐Olov. (1990). On the long way from the Coulombic Hamiltonian to the intermolecular energy surfaces: Concluding remarks at the tromsø conference, June 20–22, 1989. International Journal of Quantum Chemistry. 38(5). 741–758. 1 indexed citations

Löwdin, Per‐Olov, et al.. (1989). Some remarks on the perturbation and variation–perturbation calculations of the free energy for quantum systems. International Journal of Quantum Chemistry. 35(6). 839–850. 3 indexed citations

Löwdin, Per‐Olov. (1983). Advances in quantum molecular sciences—a tribute to Kenichi Fukui. Journal of Molecular Structure THEOCHEM. 103. 3–24. 1 indexed citations

Löwdin, Per‐Olov, Jean‐Louis Calais, & Osvaldo Goscinski. (1982). Density functional theory. International Journal of Quantum Chemistry. 21(2). 357–357. 16 indexed citations

10.

Gruninger, John, Yngve Öhrn, & Per‐Olov Löwdin. (1970). Comments on the Analysis of Atomic Correlation Energies. The Journal of Chemical Physics. 52(11). 5551–5554. 11 indexed citations

11.

Löwdin, Per‐Olov. (1966). The Projected Hartree-Fock Method: An Extension of the Independent-Particle Scheme. Defense Technical Information Center (DTIC). 601. 2 indexed citations

12.

Löwdin, Per‐Olov. (1966). The calculation of upper and lower bounds of energy eigenvalues in perturbation theory by means of partitioning techniques.. NASA Technical Reports Server (NASA). 6 indexed citations

13.

Löwdin, Per‐Olov. (1965). Isotope effect in tunneling and its influence on mutation rates. Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis. 2(3). 218–221. 24 indexed citations

14.

Löwdin, Per‐Olov. (1965). Studies in Perturbation Theory. IX. Connection Between Various Approaches in the Recent Development—Evaluation of Upper Bounds to Energy Eigenvalues in Schrödinger's Perturbation Theory. Journal of Mathematical Physics. 6(8). 1341–1353. 140 indexed citations

15.

Löwdin, Per‐Olov. (1965). Introduction. The Journal of Chemical Physics. 43(10). S1–S1. 1 indexed citations

16.

Löwdin, Per‐Olov. (1963). Wave and Reaction Operators in the Quantum Theory of Many-Particle Systems. Reviews of Modern Physics. 35(3). 702–707. 16 indexed citations

17.

Calais, Jean‐Louis & Per‐Olov Löwdin. (1962). A simple method of treating atomic integrals containing functions of r12. Journal of Molecular Spectroscopy. 8(1-6). 203–211. 111 indexed citations

18.

Löwdin, Per‐Olov. (1955). Quantum Theory of Many-Particle Systems. I. Physical Interpretations by Means of Density Matrices, Natural Spin-Orbitals, and Convergence Problems in the Method of Configurational Interaction. Physical Review. 97(6). 1474–1489. 2755 indexed citations breakdown →

19.

Löwdin, Per‐Olov. (1953). Approximate Formulas for Many-Center Integrals in the Theory of Molecules and Crystals. The Journal of Chemical Physics. 21(2). 374–375. 161 indexed citations

20.

Löwdin, Per‐Olov. (1951). A Note on the Quantum-Mechanical Perturbation Theory. The Journal of Chemical Physics. 19(11). 1396–1401. 727 indexed citations breakdown →

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.

Explore authors with similar magnitude of impact