Jan Almløf

16.0k total citations · 6 hit papers
167 papers, 13.1k citations indexed

About

Jan Almløf is a scholar working on Atomic and Molecular Physics, and Optics, Organic Chemistry and Spectroscopy. According to data from OpenAlex, Jan Almløf has authored 167 papers receiving a total of 13.1k indexed citations (citations by other indexed papers that have themselves been cited), including 108 papers in Atomic and Molecular Physics, and Optics, 43 papers in Organic Chemistry and 43 papers in Spectroscopy. Recurrent topics in Jan Almløf's work include Advanced Chemical Physics Studies (99 papers), Spectroscopy and Quantum Chemical Studies (27 papers) and Molecular Spectroscopy and Structure (20 papers). Jan Almløf is often cited by papers focused on Advanced Chemical Physics Studies (99 papers), Spectroscopy and Quantum Chemical Studies (27 papers) and Molecular Spectroscopy and Structure (20 papers). Jan Almløf collaborates with scholars based in United States, Norway and Sweden. Jan Almløf's co-authors include Thomas Fischer, Peter R. Taylor, Martin W. Feyereisen, Olav Vahtras, Svein Sæbø, Knut Fægri, Anders Heiberg, Per E. M. Siegbahn, Björn O. Roos and Vudhichai Parasuk and has published in prestigious journals such as Journal of the American Chemical Society, The Journal of Chemical Physics and The Astrophysical Journal.

In The Last Decade

Jan Almløf

166 papers receiving 12.6k 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.

General methods for geometry and wave function optimization

1992 2.2k citations Jan Almløf et al. The Journal of Physical Chemistry profile →
Integral approximations for LCAO-SCF calculations

1993 1.5k citations Jan Almløf, Martin W. Feyereisen et al. Chemical Physics Letters profile →
The complete active space SCF (CASSCF) method in a Newton–Raphson formulation with application to the HNO molecule

1981 990 citations Per E. M. Siegbahn, Jan Almløf et al. The Journal of Chemical Physics profile →
General contraction of Gaussian basis sets. I. Atomic natural orbitals for first- and second-row atoms

1987 976 citations Jan Almløf et al. The Journal of Chemical Physics profile →
Avoiding the integral storage bottleneck in LCAO calculations of electron correlation

1989 684 citations Svein Sæbø, Jan Almløf Chemical Physics Letters profile →
Principles for a direct SCF approach to LICAO–MOab‐initio calculations

1982 593 citations Jan Almløf et al. profile →

Peers

Countries citing papers authored by Jan Almløf

Since Specialization

Citations

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

Fields of papers citing papers by Jan Almløf

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Jan Almløf

This figure shows the co-authorship network connecting the top 25 collaborators of Jan Almløf. A scholar is included among the top collaborators of Jan Almløf 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 Jan Almløf. Jan Almløf is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	An efficient treatment of kinematic factors in pseudo-relativistic calculations of electronic structure 1998 ·Theoretical Chemistry Accounts ·Merethe Sjøvoll, (unknown), Odd Gropen, Jan Almløf, Bernd Schimmelpfennig, Ulf Wahlgren	4
2	Electronic Structure of Non‐Heme High‐Valent Oxoiron Complexes with the Unprecedented [Fe₂(μO)₂]³⁺ Core 1996 ·Angewandte Chemie International Edition in English ·Abhik Ghosh, Jan Almløf, Lawrence Que	27
3	Elektronenstruktur von Nicht‐Häm‐Oxoeisen‐komplexen in hohen Oxidationsstufen mit der bislang unbekannten [Fe₂(μ‐O)₂]³⁺‐Einheit 1996 ·Angewandte Chemie ·Abhik Ghosh, Jan Almløf, Lawrence Que	4
4	Hyperpolarizabilities of substituted polyphenyls 1996 ·Journal of Molecular Structure THEOCHEM ·(unknown), Jan Almløf	8
5	Towards the one-particle basis set limit of second-order correlation energies: MP2-R12 calculations on small Ben and Mgn clusters (n=1–4) 1993 ·The Journal of Chemical Physics ·Wim Klopper, Jan Almløf	74
6	Simplified sum-over-states calculations and missing-orbital analysis on hyperpolarizabilities of benzene derivatives 1993 ·Chemical Physics Letters ·Mutsumi Tomonari, Norio Ookubo, Toshikazu Takada, Martin W. Feyereisen, Jan Almløf	39
7	Density functionals without meshes and grids 1993 ·Chemical Physics Letters ·Yu Zheng, Jan Almløf	28
8	Relativistic calculations on platinum hydride using effective core potentials and first-order perturbation theory 1992 ·The Journal of Chemical Physics ·Odd Gropen, Jan Almløf, Ulf Wahlgren	17
9	Laplace transform techniques in Mo/ller–Plesset perturbation theory 1992 ·The Journal of Chemical Physics ·Marco Häser, Jan Almløf	251
10	Electronic effects of peripheral substituents in porphyrins: x-ray photoelectron spectroscopy and ab initio self-consistent field calculations 1992 ·Journal of the American Chemical Society ·Paul G. Gassman, Abhik Ghosh, Jan Almløf	110
11	Calculation of the complete-active-space self-consistent-field potential-energy surface, the dipole moment surfaces, the rotation–vibration energies, and the vibrational transition moments for C3(X 1Σ+g) 1992 ·The Journal of Chemical Physics ·Per Jensen, Celeste McMichael Rohlfing, Jan Almløf	39
12	The electronic and molecular structure of ferrocene 1991 ·The Journal of Chemical Physics ·(unknown), Jan Almløf	54
13	A theoretical study of multidimensional nuclear tunneling in malonaldehyde 1989 ·The Journal of Chemical Physics ·Norihiro Shida, Paul F. Barbara, Jan Almløf	199
14	Complete active space self-consistent field calculations of the vibrational band strengths for C3 1989 ·The Astrophysical Journal ·(unknown), Jan Almløf, Per E. M. Siegbahn	22
15	Ring puckering potential of oxetane: TZ + nP/MP4 (SDQ) results 1987 ·The Journal of Physical Chemistry ·Harrell Sellers, Jan Almløf, Svein Sæbø, Péter Pulay	17
16	CASSCF and CCI calculations of the vibrational band strengths of HCN 1985 ·The Journal of Chemical Physics ·(unknown), Jan Almløf, B. Gustafsson, Mats Larsson, Per E. M. Siegbahn	49
17	Zero Surface Tension (ZST) Theory of Micellization. 1982 ·Acta chemica Scandinavica/Acta chemica Scandinavica. B, Organic chemistry and biochemistry/Acta chemica Scandinavica. A, Physical and inorganic chemistry/Acta chemica Scandinavica. Series B. Organic chemistry and biochemistry/Acta chemica Scandinavica. Series A, Physical and inorganic chemistry ·Torben Smith Sørensen, (unknown), (unknown), Ragnhild Seip, Jan Almløf, (unknown), (unknown), Hans Peter Lüthi, Birgitte E. R. Schilling, Kjell Taugbøl, S. J. Cyvín	4
18	X-ray high-order refinements of hydrogen atoms: a theoretical approach 1979 ·Acta Crystallographica Section A ·Jan Almløf, T. Ottersen	6
19	Electrostatic Potential Field and Nucleophilicity of 3, 5, 8, 10‐Tetramethyl‐aceheptylene 1975 ·Helvetica Chimica Acta ·Jan Almløf, Edwin Haselbach, (unknown), Józef Kowalewski	5
20	Hydrogen bond studies. XLV. The crystal structure of HClO4.2.5H2O 1971 ·Acta Crystallographica Section B ·Jan Almløf, J.-O. Lundgren, I. Olovsson	8

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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