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Kimihiko Hirao

Kimihiko Hirao

RIKEN
Japan

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 78 3739 3392 214 200 400 27665
Physics 78 3148 2991 106 103 381 27435

Kimihiko Hirao publications per year

The chart shows the history of publications by Kimihiko Hirao between 1967 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Kimihiko Hirao published across 59 years, from 1967 to 2025, averaging 7 papers a year. Output peaked at 26 publications in 2000. 5 of the 413 publications appeared in the last two years.

No. of publications
5 10 15 20 25
Bar chart. Horizontal axis: year, 1967 to 2025. Vertical axis: number of publications, 0 to 26. Peak 26 publications in 2000. 1967: 1 publication 1968: 0 publications 1969: 0 publications 1970: 0 publications 1971: 2 publications 1972: 1 publication 1973: 2 publications 1974: 2 publications 1975: 2 publications 1976: 0 publications 1977: 2 publications 1978: 6 publications 1979: 4 publications 1980: 6 publications 1981: 6 publications 1982: 6 publications 1983: 6 publications 1984: 5 publications 1985: 3 publications 1986: 3 publications 1987: 5 publications 1988: 2 publications 1989: 6 publications 1990: 0 publications 1991: 3 publications 1992: 8 publications 1993: 6 publications 1994: 0 publications 1995: 2 publications 1996: 4 publications 1997: 10 publications 1998: 14 publications 1999: 21 publications 2000: 26 publications 2001: 24 publications 2002: 22 publications 2003: 23 publications 2004: 18 publications 2005: 13 publications 2006: 20 publications 2007: 18 publications 2008: 15 publications 2009: 14 publications 2010: 12 publications 2011: 12 publications 2012: 5 publications 2013: 4 publications 2014: 4 publications 2015: 8 publications 2016: 4 publications 2017: 3 publications 2018: 2 publications 2019: 6 publications 2020: 8 publications 2021: 4 publications 2022: 2 publications 2023: 3 publications 2024: 3 publications 2025: 2 publications
1967 2025

413 publications in total across all disciplines

View publications per year as a table
Kimihiko Hirao: publications per year, 1967 to 2025
Year Publications
1967 1
1968 0
1969 0
1970 0
1971 2
1972 1
1973 2
1974 2
1975 2
1976 0
1977 2
1978 6
1979 4
1980 6
1981 6
1982 6
1983 6
1984 5
1985 3
1986 3
1987 5
1988 2
1989 6
1990 0
1991 3
1992 8
1993 6
1994 0
1995 2
1996 4
1997 10
1998 14
1999 21
2000 26
2001 24
2002 22
2003 23
2004 18
2005 13
2006 20
2007 18
2008 15
2009 14
2010 12
2011 12
2012 5
2013 4
2014 4
2015 8
2016 4
2017 3
2018 2
2019 6
2020 8
2021 4
2022 2
2023 3
2024 3
2025 2
Total 413
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Kimihiko Hirao publication distribution in Physics in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Physics in 2026. The highlighted bar marks where Kimihiko Hirao sits on this spectrum.

No. of scientists
50 100 150
Bar chart with 70 bars. Horizontal axis: publications, 103–122 to 1,469+. Vertical axis: number of scientists, 0 to 162. Most scientists, 162, have 323–342 publications. The last bar groups every scientist with 1,469 publications or more. The highlighted bar, 363–382 publications, is where this scientist sits. 103–122 publications: 7 scientists 123–142 publications: 10 scientists 143–162 publications: 31 scientists 163–182 publications: 35 scientists 183–202 publications: 53 scientists 203–222 publications: 81 scientists 223–242 publications: 85 scientists 243–262 publications: 112 scientists 263–282 publications: 114 scientists 283–302 publications: 126 scientists 303–322 publications: 136 scientists 323–342 publications: 162 scientists 343–362 publications: 155 scientists 363–382 publications: 156 scientists 383–402 publications: 134 scientists 403–422 publications: 145 scientists 423–442 publications: 147 scientists 443–462 publications: 131 scientists 463–482 publications: 131 scientists 483–502 publications: 116 scientists 503–522 publications: 106 scientists 523–542 publications: 103 scientists 543–562 publications: 87 scientists 563–582 publications: 84 scientists 583–602 publications: 94 scientists 603–622 publications: 70 scientists 623–642 publications: 76 scientists 643–662 publications: 60 scientists 663–682 publications: 54 scientists 683–702 publications: 60 scientists 703–722 publications: 48 scientists 723–742 publications: 64 scientists 743–762 publications: 48 scientists 763–782 publications: 37 scientists 783–802 publications: 43 scientists 803–822 publications: 34 scientists 823–842 publications: 36 scientists 843–862 publications: 32 scientists 863–882 publications: 32 scientists 883–902 publications: 31 scientists 903–922 publications: 25 scientists 923–942 publications: 15 scientists 943–962 publications: 24 scientists 963–982 publications: 13 scientists 983–1,002 publications: 21 scientists 1,003–1,022 publications: 21 scientists 1,023–1,042 publications: 16 scientists 1,043–1,062 publications: 9 scientists 1,063–1,082 publications: 19 scientists 1,083–1,102 publications: 11 scientists 1,103–1,122 publications: 17 scientists 1,123–1,142 publications: 11 scientists 1,143–1,162 publications: 7 scientists 1,163–1,182 publications: 4 scientists 1,183–1,202 publications: 10 scientists 1,203–1,222 publications: 8 scientists 1,223–1,242 publications: 16 scientists 1,243–1,262 publications: 4 scientists 1,263–1,282 publications: 10 scientists 1,283–1,302 publications: 5 scientists 1,303–1,322 publications: 7 scientists 1,323–1,342 publications: 4 scientists 1,343–1,362 publications: 8 scientists 1,363–1,382 publications: 6 scientists 1,383–1,402 publications: 7 scientists 1,403–1,422 publications: 3 scientists 1,423–1,442 publications: 4 scientists 1,443–1,462 publications: 4 scientists 1,463–1,468 publications: 3 scientists 1,469+ publications: 100 scientists
103–122 publications 1,469+

This scientist: 381 publications — 34th percentile

34% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,469 publications or more.

View publications distribution as a table
Number of Physics scientists by publication count, Research.com 2026 ranking edition. Based on 3,678 ranked scientists.
Publications Scientists This scientist
103–122 7
123–142 10
143–162 31
163–182 35
183–202 53
203–222 81
223–242 85
243–262 112
263–282 114
283–302 126
303–322 136
323–342 162
343–362 155
363–382 156 381
383–402 134
403–422 145
423–442 147
443–462 131
463–482 131
483–502 116
503–522 106
523–542 103
543–562 87
563–582 84
583–602 94
603–622 70
623–642 76
643–662 60
663–682 54
683–702 60
703–722 48
723–742 64
743–762 48
763–782 37
783–802 43
803–822 34
823–842 36
843–862 32
863–882 32
883–902 31
903–922 25
923–942 15
943–962 24
963–982 13
983–1,002 21
1,003–1,022 21
1,023–1,042 16
1,043–1,062 9
1,063–1,082 19
1,083–1,102 11
1,103–1,122 17
1,123–1,142 11
1,143–1,162 7
1,163–1,182 4
1,183–1,202 10
1,203–1,222 8
1,223–1,242 16
1,243–1,262 4
1,263–1,282 10
1,283–1,302 5
1,303–1,322 7
1,323–1,342 4
1,343–1,362 8
1,363–1,382 6
1,383–1,402 7
1,403–1,422 3
1,423–1,442 4
1,443–1,462 4
1,463–1,468 3
1,469+ 100
Download as CSV

Kimihiko Hirao D-index placement in Physics in 2026

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

No. of scientists
50 100 150
Bar chart with 59 bars. Horizontal axis: D-Index, 70–71 to 185+. Vertical axis: number of scientists, 0 to 167. Most scientists, 167, have 80–81 D-Index. The last bar groups every scientist with 185 D-Index or more. The highlighted bar, 78–79 D-Index, is where this scientist sits. 70–71 D-Index: 76 scientists 72–73 D-Index: 110 scientists 74–75 D-Index: 143 scientists 76–77 D-Index: 153 scientists 78–79 D-Index: 144 scientists 80–81 D-Index: 167 scientists 82–83 D-Index: 167 scientists 84–85 D-Index: 166 scientists 86–87 D-Index: 132 scientists 88–89 D-Index: 155 scientists 90–91 D-Index: 134 scientists 92–93 D-Index: 137 scientists 94–95 D-Index: 102 scientists 96–97 D-Index: 112 scientists 98–99 D-Index: 110 scientists 100–101 D-Index: 116 scientists 102–103 D-Index: 97 scientists 104–105 D-Index: 103 scientists 106–107 D-Index: 87 scientists 108–109 D-Index: 90 scientists 110–111 D-Index: 67 scientists 112–113 D-Index: 78 scientists 114–115 D-Index: 75 scientists 116–117 D-Index: 67 scientists 118–119 D-Index: 69 scientists 120–121 D-Index: 60 scientists 122–123 D-Index: 59 scientists 124–125 D-Index: 53 scientists 126–127 D-Index: 42 scientists 128–129 D-Index: 41 scientists 130–131 D-Index: 33 scientists 132–133 D-Index: 32 scientists 134–135 D-Index: 45 scientists 136–137 D-Index: 19 scientists 138–139 D-Index: 24 scientists 140–141 D-Index: 28 scientists 142–143 D-Index: 31 scientists 144–145 D-Index: 22 scientists 146–147 D-Index: 20 scientists 148–149 D-Index: 12 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 24 scientists 154–155 D-Index: 23 scientists 156–157 D-Index: 15 scientists 158–159 D-Index: 15 scientists 160–161 D-Index: 11 scientists 162–163 D-Index: 17 scientists 164–165 D-Index: 12 scientists 166–167 D-Index: 11 scientists 168–169 D-Index: 9 scientists 170–171 D-Index: 9 scientists 172–173 D-Index: 11 scientists 174–175 D-Index: 4 scientists 176–177 D-Index: 8 scientists 178–179 D-Index: 5 scientists 180–181 D-Index: 3 scientists 182–183 D-Index: 4 scientists 184 D-Index: 4 scientists 185+ D-Index: 99 scientists
70–71 D-Index 185+

This scientist: 78 D-Index — 15th percentile

15% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 185 D-Index or more.

View D-Index distribution as a table
Number of Physics scientists by D-index, Research.com 2026 ranking edition. Based on 3,678 ranked scientists.
D-Index Scientists This scientist
70–71 76
72–73 110
74–75 143
76–77 153
78–79 144 78
80–81 167
82–83 167
84–85 166
86–87 132
88–89 155
90–91 134
92–93 137
94–95 102
96–97 112
98–99 110
100–101 116
102–103 97
104–105 103
106–107 87
108–109 90
110–111 67
112–113 78
114–115 75
116–117 67
118–119 69
120–121 60
122–123 59
124–125 53
126–127 42
128–129 41
130–131 33
132–133 32
134–135 45
136–137 19
138–139 24
140–141 28
142–143 31
144–145 22
146–147 20
148–149 12
150–151 16
152–153 24
154–155 23
156–157 15
158–159 15
160–161 11
162–163 17
164–165 12
166–167 11
168–169 9
170–171 9
172–173 11
174–175 4
176–177 8
178–179 5
180–181 3
182–183 4
184 4
185+ 99
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Overview

Kimihiko Hirao is a researcher affiliated with RIKEN in Japan whose work spans several interconnected scientific disciplines. Their publications encompass the fields of Physics and Astronomy, Chemistry, and Materials Science, with a particular focus on subfields such as Atomic and Molecular Physics, and Optics, Materials Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, and Molecular Biology.

Their research predominantly covers topics including Advanced Chemical Physics Studies, Free Radicals and Antioxidants, Spectroscopy and Quantum Chemical Studies, Machine Learning in Materials Science, Photochemistry and Electron Transfer Studies, Catalytic Processes in Materials Science, and Advanced Physical and Chemical Molecular Interactions.

Their recent scholarly output includes the following papers:

  • Koopmans'-Type Theorem in Kohn-Sham Theory with Optimally Tuned Long-Range-Corrected (LC) Functionals, 2021, The Journal of Physical Chemistry A
  • A computational study on the kinetics of pyrolysis of isopropyl propionate as a biodiesel model: DFT and ab initio investigation, 2020, Fuel
  • An improved Slater's transition state approximation, 2021, The Journal of Chemical Physics
  • Excitation energies expressed as orbital energies of Kohn-Sham density functional theory with long-range corrected functionals, 2020, Journal of Computational Chemistry
  • The core ionization energies calculated by delta SCF and Slater's transition state theory, 2023, The Journal of Chemical Physics

Kimihiko Hirao's frequent publication venues reflect their multidisciplinary expertise and include:

  • The Journal of Physical Chemistry A
  • The Journal of Chemical Physics
  • Journal of Computational Chemistry
  • Fuel
  • The Journal of Physical Chemistry Letters

Collaboration is an integral part of their research activities. Frequent co-authors include Bun Chan, Takahito Nakajima, Jong-Won Song, Han-Seok Bae, and Ho-Jin Lee, highlighting a network of researchers contributing to their scientific investigations.

Best Publications

  • A long-range correction scheme for generalized-gradient-approximation exchange functionals

    Hisayoshi Iikura;Takao Tsuneda;Takeshi Yanai;Kimihiko Hirao

  • A long-range-corrected time-dependent density functional theory

    Yoshihiro Tawada;Takao Tsuneda;Susumu Yanagisawa;Takeshi Yanai

  • Multireference Møller-Plesset method

    K. Hirao

  • Cluster expansion of the wavefunction. Symmetry-adapted-cluster expansion, its variational determination, and extension of open-shell orbital theory

    H. Nakatsuji;K. Hirao

  • NWChem: Past, Present, and Future

    E. Aprà;E. J. Bylaska;W. A. de Jong;N. Govind

  • NWChem: Past, present, and future

    E. Aprà;E. J. Bylaska;W. A. de Jong;N. Govind

  • On Koopmans' theorem in density functional theory.

    Takao Tsuneda;Jong-Won Song;Satoshi Suzuki;Kimihiko Hirao

  • Multireference Møller—Plesset perturbation theory for high-spin open-shell systems

    K. Hirao

  • On non-negativity of Fukui function indices

    Ram Kinkar Roy;Sourav Pal;Kimihiko Hirao

  • State-specific multireference Møller—Plesset perturbation treatment for singlet and triplet excited states, ionized states and electron attached states of H2O

    K. Hirao

  • A NEW ONE-PARAMETER PROGRESSIVE COLLE-SALVETTI-TYPE CORRELATION FUNCTIONAL

    Takao Tsuneda;Toshihisa Suzumura;Kimihiko Hirao

  • The higher-order Douglas–Kroll transformation

    Takahito Nakajima;Kimihiko Hirao

  • Long-range corrected density functional calculations of chemical reactions: Redetermination of parameter

    Jong-Won Song;Tsuyoshi Hirosawa;Takao Tsuneda;Kimihiko Hirao

  • A density functional study of van der Waals interactions

    Muneaki Kamiya;Takao Tsuneda;Kimihiko Hirao

  • Nonlinear optical property calculations by the long-range-corrected coupled-perturbed Kohn-Sham method.

    Muneaki Kamiya;Hideo Sekino;Takao Tsuneda;Kimihiko Hirao

  • The Douglas-Kroll-Hess approach.

    Takahito Nakajima;Kimihiko Hirao

  • Polarizability and second hyperpolarizability evaluation of long molecules by the density functional theory with long-range correction

    Hideo Sekino;Yasuyuki Maeda;Muneaki Kamiya;Kimihiko Hirao

  • Multireference Møller–Plesset perturbation treatment of potential energy curve of N2

    K. Hirao

  • A generalization of the Davidson's method to large nonsymmetric eigenvalue problems

    K. Hirao;H. Nakatsuji

  • An investigation of density functionals: The first-row transition metal dimer calculations

    Susumu Yanagisawa;Takao Tsuneda;Kimihiko Hirao

Frequent Co-Authors

Tetsuya Taketsugu
Tetsuya Taketsugu Hokkaido University
Takeshi Yanai
Takeshi Yanai Nagoya University
So Hirata
So Hirata University of Illinois at Urbana-Champaign
Michel Dupuis
Michel Dupuis University at Buffalo, State University of New York
Koichi Yamashita
Koichi Yamashita University of Tokyo
Mark S. Gordon
Mark S. Gordon Iowa State University
Hiroshi Nakatsuji
Hiroshi Nakatsuji Kyoto University
Djamaladdin G. Musaev
Djamaladdin G. Musaev Emory University
Young-Kyu Han
Young-Kyu Han Dongguk University
Robert J. Harrison
Robert J. Harrison Murdoch University

External Links

Personal website of Kimihiko Hirao

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