Per‐Olof Widmark

11.7k total citations · 6 hit papers
34 papers, 9.3k citations indexed

About

Per‐Olof Widmark is a scholar working on Atomic and Molecular Physics, and Optics, Organic Chemistry and Physical and Theoretical Chemistry. According to data from OpenAlex, Per‐Olof Widmark has authored 34 papers receiving a total of 9.3k indexed citations (citations by other indexed papers that have themselves been cited), including 26 papers in Atomic and Molecular Physics, and Optics, 7 papers in Organic Chemistry and 7 papers in Physical and Theoretical Chemistry. Recurrent topics in Per‐Olof Widmark's work include Advanced Chemical Physics Studies (26 papers), Atomic and Molecular Physics (12 papers) and Advanced Physical and Chemical Molecular Interactions (6 papers). Per‐Olof Widmark is often cited by papers focused on Advanced Chemical Physics Studies (26 papers), Atomic and Molecular Physics (12 papers) and Advanced Physical and Chemical Molecular Interactions (6 papers). Per‐Olof Widmark collaborates with scholars based in Sweden, Spain and United States. Per‐Olof Widmark's co-authors include Björn O. Roos, Bj�rn O. Roos, Valera Veryazov, Roland Lindh, Per‐Åke Malmqvist, B. Joakim Persson, Gunnar Karlström, Pavel Neogrády, Bernd Schimmelpfennig and Luis Seijo and has published in prestigious journals such as Angewandte Chemie International Edition, The Journal of Chemical Physics and Physical Review A.

In The Last Decade

Per‐Olof Widmark

34 papers receiving 9.1k citations

Hit Papers

Density matrix averaged atomic natural orbital (ANO) basi... 1990 2026 2002 2014 1990 2003 2003 2005 1991 500 1000 1.5k
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.

  1. Density matrix averaged atomic natural orbital (ANO) basis sets for correlated molecular wave functions
    1990 1.8k citations Per‐Olof Widmark, Bj�rn O. Roos et al. Theoretical Chemistry Accounts profile →
  2. MOLCAS: a program package for computational chemistry
    2003 1.6k citations Gunnar Karlström, Roland Lindh et al. Computational Materials Science profile →
  3. Main Group Atoms and Dimers Studied with a New Relativistic ANO Basis Set
    2003 1.3k citations Björn O. Roos, Roland Lindh et al. The Journal of Physical Chemistry A profile →
  4. New Relativistic ANO Basis Sets for Transition Metal Atoms
    2005 951 citations Björn O. Roos, Roland Lindh et al. The Journal of Physical Chemistry A profile →
  5. Density matrix averaged atomic natural orbital (ANO) basis sets for correlated molecular wave functions
    1991 657 citations Per‐Olof Widmark, Bj�rn O. Roos et al. Theoretical Chemistry Accounts profile →
  6. Density matrix averaged atomic natural orbital (ANO) basis sets for correlated molecular wave functions
    1995 485 citations Per‐Olof Widmark, Bj�rn O. Roos et al. Theoretical Chemistry Accounts profile →

Peers

Per‐Olof Widmark
Bernd A. Heß Germany
Jean‐Paul Malrieu France
Valera Veryazov Sweden
Jianmin Tao United States
Renzo Cimiraglia Italy
Celestino Angeli Italy
Majed Chergui Switzerland
Andrzej J. Sadlej Sweden
Viktor N. Staroverov Canada
Bernard Kirtman United States
Bernd A. Heß Germany
Per‐Olof Widmark
Citations per year, relative to Per‐Olof Widmark Per‐Olof Widmark (= 1×) peers Bernd A. Heß

Countries citing papers authored by Per‐Olof Widmark

Since Specialization
Citations

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

Fields of papers citing papers by Per‐Olof Widmark

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Per‐Olof Widmark

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

All Works

20 of 20 papers shown
1.
Zobel, J. Patrick, Per‐Olof Widmark, & Valera Veryazov. (2021). Correction to “The ANO-R Basis Set”. Journal of Chemical Theory and Computation. 17(5). 3233–3234. 16 indexed citations
2.
Zobel, J. Patrick, Per‐Olof Widmark, & Valera Veryazov. (2019). The ANO-R Basis Set. Journal of Chemical Theory and Computation. 16(1). 278–294. 42 indexed citations
3.
Ugandi, Mihkel, Ignacio Fdez. Galván, Per‐Olof Widmark, & Roland Lindh. (2018). Uncontracted basis sets for ab initio calculations of muonic atoms and molecules. International Journal of Quantum Chemistry. 118(21). 1 indexed citations
4.
Widmark, Per‐Olof, J. Patrick Zobel, Victor P. Vysotskiy, Takashi Tsuchiya, & Valera Veryazov. (2018). New compact density matrix averaged ANO basis sets for relativistic calculations. The Journal of Chemical Physics. 149(19). 194102–194102. 8 indexed citations
5.
Widmark, Per‐Olof, et al.. (2010). Basis set representation of the electron density at an atomic nucleus. The Journal of Chemical Physics. 133(14). 144111–144111. 24 indexed citations
6.
Brynda, M., Laura Gagliardi, Per‐Olof Widmark, Philip P. Power, & Björn O. Roos. (2006). A Quantum Chemical Study of the Quintuple Bond between Two Chromium Centers in [PhCrCrPh]: trans‐Bent versus Linear Geometry. Angewandte Chemie. 118(23). 3888–3891. 59 indexed citations
7.
Brynda, M., Laura Gagliardi, Per‐Olof Widmark, Philip P. Power, & Björn O. Roos. (2006). A Quantum Chemical Study of the Quintuple Bond between Two Chromium Centers in [PhCrCrPh]: trans‐Bent versus Linear Geometry. Angewandte Chemie International Edition. 45(23). 3804–3807. 271 indexed citations
8.
Roos, Björn O., Roland Lindh, Per‐Åke Malmqvist, Valera Veryazov, & Per‐Olof Widmark. (2005). New Relativistic ANO Basis Sets for Transition Metal Atoms. The Journal of Physical Chemistry A. 109(29). 6575–6579. 951 indexed citations breakdown →
9.
Veryazov, Valera, Per‐Olof Widmark, Luis Serrano‐Andrés, Roland Lindh, & Björn O. Roos. (2004). 2MOLCAS as a development platform for quantum chemistry software. International Journal of Quantum Chemistry. 100(4). 626–635. 305 indexed citations
10.
Roos, Bj�rn O., Per‐Olof Widmark, & Laura Gagliardi. (2003). The ground state and electronic spectrum of CUO: a mystery. Faraday Discussions. 124. 57–57. 30 indexed citations
11.
Karlström, Gunnar, Roland Lindh, Per‐Åke Malmqvist, et al.. (2003). MOLCAS: a program package for computational chemistry. Computational Materials Science. 28(2). 222–239. 1610 indexed citations breakdown →
12.
Roos, Björn O., Valera Veryazov, & Per‐Olof Widmark. (2003). Relativistic atomic natural orbital type basis sets for the alkaline and alkaline-earth atoms applied to the ground-state potentials for the corresponding dimers. Theoretical Chemistry Accounts. 111(2-6). 345–351. 304 indexed citations
13.
Schütz, Martin, et al.. (2002). The ammonia dimer equilibrium dissociation energy: convergence to the basis set limit at the correlated level. Molecular Physics. 100(21). 3389–3399. 30 indexed citations
14.
Heinemann, Christoph, Wolfram Koch, Gottlieb‐Georg Lindner, D. Reinen, & Per‐Olof Widmark. (1996). Ground- and excited-state properties of neutral and anionic selenium dimers and trimers. Physical Review A. 54(3). 1979–1993. 26 indexed citations
15.
Pou‐Amérigo, Rosendo, Manuela Merchán, Ignacio Nebot‐Gil, Per‐Olof Widmark, & Björn O. Roos. (1995). Density matrix averaged atomic natural orbital (ANO) basis sets for correlated molecular wave functions. Theoretical Chemistry Accounts. 92(3). 149–181. 258 indexed citations
16.
Andersson, Kerstin, Björn O. Roos, Per‐Åke Malmqvist, & Per‐Olof Widmark. (1994). The Cr2 potential energy curve studied with multiconfigurational second-order perturbation theory. Chemical Physics Letters. 230(4-5). 391–397. 111 indexed citations
17.
Ullner, Magnus, Bo Jönsson, & Per‐Olof Widmark. (1994). Conformational properties and apparent dissociation constants of titrating polyelectrolytes: Monte Carlo simulation and scaling arguments. The Journal of Chemical Physics. 100(4). 3365–3366. 42 indexed citations
18.
Olsen, Jeppe, Per‐Åke Malmqvist, Björn O. Roos, Roland Lindh, & Per‐Olof Widmark. (1987). A non-linear approach to configuration interaction. Chemical Physics Letters. 133(2). 91–101. 9 indexed citations
19.
Widmark, Per‐Olof, et al.. (1987). A CASSCF and CCI study of the formation of the Ni2(C2H4) complex. Theoretical Chemistry Accounts. 71(6). 411–423. 4 indexed citations
20.
Jaszuński, Michał, Björn O. Roos, & Per‐Olof Widmark. (1981). A CASSCF study of the potential curves for the X 1Σ+, B 1Σ+, and A 1Π states of the BH molecule. The Journal of Chemical Physics. 75(1). 306–314. 64 indexed citations

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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