World's Best Scientists 2026 revealed!

D-Index & Metrics

Chemistry

D-Index
64
Citations
35290
World Ranking
7898
National Ranking
453

Peter J. Knowles publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Peter J. Knowles sits on this spectrum.

61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61 publications 1,295+

This scientist: 155 publications — 16th percentile

16% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

Peter J. Knowles D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Peter J. Knowles sits on this spectrum.

40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40 D-Index 159+

This scientist: 64 D-Index — 56th percentile

56% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

Overview

Peter J. Knowles is affiliated with Cardiff University in the United Kingdom. Their research spans several interconnected fields within the physical sciences, with a primary focus on physics and astronomy as well as chemistry.

The main areas of study include:

  • Physics and Astronomy
  • Chemistry

Within these broad disciplines, Knowles has contributed extensively to specialized subfields such as:

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Statistical and Nonlinear Physics

Their work engages topics including:

  • Advanced Chemical Physics Studies
  • Spectroscopy and Quantum Chemical Studies
  • Photochemistry and Electron Transfer Studies
  • Molecular Spectroscopy and Chirality
  • Advanced Thermodynamics and Statistical Mechanics
  • Catalytic Processes in Materials Science
  • Spectroscopy and Laser Applications

Peter J. Knowles has published frequently in key scientific venues, particularly:

  • The Journal of Chemical Physics
  • Faraday Discussions
  • Physical Review A / Physical Review, A
  • Organic & Biomolecular Chemistry
  • Journal of Computational Chemistry

Examples of recent publications include:

  • "MCSCF optimization revisited. II. Combined first- and second-order orbital optimization for large molecules," 2020, The Journal of Chemical Physics
  • "Alkyl groups in organic molecules are NOT inductively electron-releasing," 2024, Organic & Biomolecular Chemistry
  • "Information entropy as a measure of the correlation energy associated with the cumulant," 2021, Physical Review A / Physical Review, A
  • "Polaritonic effects in the vibronic spectrum of molecules in an optical cavity," 2022, The Journal of Chemical Physics
  • "Molecular second-quantized Hamiltonian: Electron correlation and non-adiabatic coupling treated on an equal footing," 2020, The Journal of Chemical Physics

Frequent collaborators of Knowles include:

  • Hans-Joachim Werner
  • Frederick R. Manby
  • Yu Wang
  • Jian Wang
  • Andreas Heßelmann

Best Publications

  • An efficient internally contracted multiconfiguration–reference configuration interaction method

    Hans‐Joachim Werner;Peter J. Knowles

  • Molpro: a general-purpose quantum chemistry program package

    Hans-Joachim Werner;Peter James Knowles;Gerald Knizia;Frederick R. Manby

  • A second order multiconfiguration SCF procedure with optimum convergence

    Hans‐Joachim Werner;Peter J. Knowles

  • An efficient method for the evaluation of coupling coefficients in configuration interaction calculations

    Peter J. Knowles;Hans-Joachim Werner

  • An efficient second-order MC SCF method for long configuration expansions

    Peter J. Knowles;Hans-Joachim Werner

  • Coupled cluster theory for high spin, open shell reference wave functions

    Peter J. Knowles;Claudia Hampel;Hans‐Joachim Werner

  • Perturbative corrections to account for triple excitations in closed and open shell coupled cluster theories

    Miles J.O. Deegan;Peter J. Knowles

  • Spin-orbit matrix elements for internally contracted multireference configuration interaction wavefunctions

    Andreas Berning;Marcus Schweizer;Hans-Joachim Werner;Peter J. Knowles

  • The Molpro quantum chemistry package.

    Hans-Joachim Werner;Peter J. Knowles;Frederick R. Manby;Joshua A. Black

  • Fast linear scaling second-order Møller-Plesset perturbation theory (MP2) using local and density fitting approximations

    Hans-Joachim Werner;Frederick R. Manby;Peter James Knowles

  • A new determinant-based full configuration interaction method

    P.J. Knowles;N.C. Handy

  • Erratum: “Coupled cluster theory for high spin, open shell reference wave functions” [ J. Chem. Phys. 99, 5219 (1993)]

    Peter J. Knowles;Claudia Hampel;Hans-Joachim Werner

  • Internally contracted multiconfiguration-reference configuration interaction calculations for excited states

    Peter J. Knowles;Hans-Joachim Werner

  • On the convergence of the Møller-Plesset perturbation series

    N. C. Handy;P. J. Knowles;K. Somasundram

  • Fast Hartree-Fock theory using local density fitting approximations

    Robert Polly;Hans-Joachim Werner;Frederick R. Manby;Peter James Knowles

  • High-Accuracy ab Initio Rotation-Vibration Transitions for Water

    Oleg L. Polyansky;Attila G. Csaszar;Sergei V. Shirin;Nikolai F. Zobov

  • A determinant based full configuration interaction program

    Peter J. Knowles;Nicholas C. Handy

  • Restricted Møller—Plesset theory for open-shell molecules

    Peter J. Knowles;Jamie S. Andrews;Roger D. Amos;Nicholas C. Handy

  • Benchmark full configuration-interaction calculations on H2O, F- and F

    Charles W. Bauschlicher;Peter R. Taylor

  • A comparison of variational and non-variational internally contracted multiconfiguration-reference configuration interaction calculations

    Hans-Joachim Werner;Peter J. Knowles

Frequent Co-Authors

Hans-Joachim Werner
Hans-Joachim Werner University of Stuttgart
Nicholas C. Handy
Nicholas C. Handy University of Cambridge
Pavel Rosmus
Pavel Rosmus Gustave Eiffel University
Nikos L. Doltsinis
Nikos L. Doltsinis University of Münster
Jonathan Tennyson
Jonathan Tennyson University College London
John N. Murrell
John N. Murrell University of Sussex
Harold Linnartz
Harold Linnartz Leiden University
Roger D. Amos
Roger D. Amos Australian National University
Stephen R. Leone
Stephen R. Leone University of California, Berkeley
Kirk A. Peterson
Kirk A. Peterson Washington State University

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