World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 72 5295 4809 1651 1377 406 17364
Physics 79 3107 2950 1488 1385 479 19764

Takeshi Oka publications per year

The chart shows the history of publications by Takeshi Oka between 1956 and 2023, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Takeshi Oka published across 68 years, from 1956 to 2023, averaging 7.3 papers a year. Output peaked at 20 publications in 2003. 4 of the 495 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1956 to 2023. Vertical axis: number of publications, 0 to 20. Peak 20 publications in 2003. 1956: 2 publications 1957: 2 publications 1958: 1 publication 1959: 1 publication 1960: 4 publications 1961: 2 publications 1962: 4 publications 1963: 2 publications 1964: 4 publications 1965: 1 publication 1966: 2 publications 1967: 4 publications 1968: 3 publications 1969: 3 publications 1970: 6 publications 1971: 3 publications 1972: 4 publications 1973: 8 publications 1974: 8 publications 1975: 5 publications 1976: 6 publications 1977: 13 publications 1978: 6 publications 1979: 6 publications 1980: 7 publications 1981: 5 publications 1982: 5 publications 1983: 10 publications 1984: 9 publications 1985: 5 publications 1986: 6 publications 1987: 15 publications 1988: 11 publications 1989: 14 publications 1990: 11 publications 1991: 15 publications 1992: 15 publications 1993: 10 publications 1994: 16 publications 1995: 7 publications 1996: 7 publications 1997: 14 publications 1998: 9 publications 1999: 7 publications 2000: 14 publications 2001: 6 publications 2002: 14 publications 2003: 20 publications 2004: 9 publications 2005: 17 publications 2006: 8 publications 2007: 6 publications 2008: 5 publications 2009: 6 publications 2010: 12 publications 2011: 12 publications 2012: 5 publications 2013: 14 publications 2014: 8 publications 2015: 10 publications 2016: 3 publications 2017: 1 publication 2018: 2 publications 2019: 7 publications 2020: 8 publications 2021: 6 publications 2022: 1 publication 2023: 3 publications
1956 2023

495 publications in total across all disciplines

View publications per year as a table
Takeshi Oka: publications per year, 1956 to 2023
Year Publications
1956 2
1957 2
1958 1
1959 1
1960 4
1961 2
1962 4
1963 2
1964 4
1965 1
1966 2
1967 4
1968 3
1969 3
1970 6
1971 3
1972 4
1973 8
1974 8
1975 5
1976 6
1977 13
1978 6
1979 6
1980 7
1981 5
1982 5
1983 10
1984 9
1985 5
1986 6
1987 15
1988 11
1989 14
1990 11
1991 15
1992 15
1993 10
1994 16
1995 7
1996 7
1997 14
1998 9
1999 7
2000 14
2001 6
2002 14
2003 20
2004 9
2005 17
2006 8
2007 6
2008 5
2009 6
2010 12
2011 12
2012 5
2013 14
2014 8
2015 10
2016 3
2017 1
2018 2
2019 7
2020 8
2021 6
2022 1
2023 3
Total 495
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Takeshi Oka publications per year - data summary

  • Takeshi Oka, a Physics scholar from University of Chicago, has 495 publications recorded across 68 years, from 1956 to 2023.
  • The oldest publication on record dates to 1956 and the most recent to 2023.
  • The most productive year is 2003, with 20 publications.
  • The least productive years with any output are 1958, 1959, 1965, 2017 and others, with 1 publication each.
  • The rate of publication averages 7.3 papers per year over the whole span, or 7.3 per year counting only the 68 years with at least one publication.
  • The last 5 years on the chart (2019-2023) hold 25 publications, 5% of the career total.
  • Split into equal eras - 1956-1978: 94 publications (4.1 per year); 1979-2001: 224 publications (9.7 per year); 2002-2023: 177 publications (8.0 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Takeshi Oka 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 Takeshi Oka 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, 463–482 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: 479 publications — 52nd percentile

52% 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
383–402 134
403–422 145
423–442 147
443–462 131
463–482 131 479
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
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Takeshi Oka publication distribution in Physics in 2026 - data summary

  • The chart plots the publication count of all 3,678 Physics scientists ranked by Research.com in 2026, grouped into 70 ranges running from 103–122 to 1,469+ publications.
  • Takeshi Oka, a Physics scholar from University of Chicago, records 479 publications - the 52nd percentile of the discipline.
  • 52% of ranked Physics scientists score the same or lower than Takeshi Oka, and about 48% score higher.
  • The median of the discipline falls in the 463–482 publications range, and Takeshi Oka falls inside that same range.
  • The most crowded range is 323–342 publications, holding 162 scientists (4% of the field).
  • 49% of the field sits in the lowest quarter of the value range (up to 443–462 publications), so the distribution leans towards the lower end of the scale.
  • The final bar has no upper bound: it groups every scientist with 1,469 publications or more, 100 scientists in all (3% of the field).

Takeshi Oka 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 Takeshi Oka 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: 79 D-Index — 17th percentile

17% 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 79
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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Takeshi Oka D-index placement in Physics in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 3,678 Physics scientists ranked by Research.com in 2026, grouped into 59 ranges running from 70–71 to 185+ D-Index.
  • Takeshi Oka, a Physics scholar from University of Chicago, records 79 D-Index - the 17th percentile of the discipline.
  • 17% of ranked Physics scientists score the same or lower than Takeshi Oka, and about 83% score higher.
  • The median of the discipline falls in the 96–97 D-Index range, and Takeshi Oka ranks below the median.
  • The most crowded range is 80–81 D-Index, holding 167 scientists (5% of the field).
  • 55% of the field sits in the lowest quarter of the value range (up to 98–99 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 185 D-Index or more, 99 scientists in all (3% of the field).

Research.com Recognitions

  • 2004 - Davy Medal, Royal Society of London (UK) For his many and varied contributions to molecular spectroscopy and its applications, particularly to astronomy
  • 2002 - E. Bright Wilson Award in Spectroscopy, American Chemical Society (ACS)
  • 1998 - Ellis R. Lippincott Award, The Optical Society
  • 1987 - Fellow of the American Academy of Arts and Sciences
  • 1984 - Fellow of the Royal Society, United Kingdom
  • 1982 - Fellow of American Physical Society (APS)
  • 1982 - Earle K. Plyler Prize for Molecular Spectroscopy, American Physical Society
  • 1981 - Centenary Prize, Royal Society of Chemistry (UK)
  • 1977 - Fellow of the Royal Society of Canada Academy of Science

Overview

Takeshi Oka is affiliated with the University of Chicago in the United States. Their research spans fields primarily in Physics and Astronomy, as well as Chemistry. The work is focused on subfields such as Astronomy and Astrophysics, Spectroscopy, Atomic and Molecular Physics and Optics, Atmospheric Science, and Instrumentation.

The main topics covered in Takeshi Oka's research include:

  • Astrophysics and Star Formation Studies
  • Stellar, planetary, and galactic studies
  • Spectroscopy and Laser Applications
  • Molecular Spectroscopy and Structure
  • Advanced Chemical Physics Studies
  • Atmospheric Ozone and Climate
  • Astronomy and Astrophysical Research

Their recent publications reflect a concentration on molecular spectroscopy and astrophysical phenomena. The notable papers include:

  • "Forbidden rotational transitions and astrophysics," 2021, Journal of Molecular Spectroscopy
  • "The Central 300 pc of the Galaxy Probed by Infrared Spectra of H3+ and CO. III. Locations of Sgr B2 and Star Iota," 2022, The Astrophysical Journal
  • "Watson's papers on the vibration-rotation interaction," 2022, Journal of Molecular Spectroscopy
  • "A CRITICAL EXAMINATION OF THE ELLIPTIC FACE-ON VIEW WITH HIGH ECCENTRICITY OF THE CENTRAL MOLECULAR ZONE OF THE GALACTIC CENTER," 2020, Proceedings of the 2020 International Symposium on Molecular Spectroscopy
  • "RADIAL LOCATION OF SGR B2 MEASURED FROM H3+AND H2O+ ABSORPTION SPECTRA," 2021, Proceedings of the 2021 International Symposium on Molecular Spectroscopy

Takeshi Oka has frequently published in the following venues:

  • Journal of Molecular Spectroscopy
  • Proceedings of the 2021 International Symposium on Molecular Spectroscopy
  • The Astrophysical Journal
  • Proceedings of the 2020 International Symposium on Molecular Spectroscopy

The scientist has collaborated notably with T. R. Geballe on at least two occasions.

Takeshi Oka's career includes multiple recognitions and awards. They have been honored with fellowships by prominent scientific societies and professional organizations:

  • Fellow of the American Academy of Arts and Sciences (1987)
  • Fellow of the Royal Society, United Kingdom (1984)
  • Fellow of American Physical Society (1982)
  • Fellow of the Royal Society of Canada (1977)

Other awards include:

  • Davy Medal, Royal Society of London (2004) for contributions to molecular spectroscopy and its applications, particularly in astronomy
  • E. Bright Wilson Award in Spectroscopy, American Chemical Society (2002)
  • Ellis R. Lippincott Award, The Optical Society (1998)
  • Earle K. Plyler Prize for Molecular Spectroscopy, American Physical Society (1982)
  • Centenary Prize, Royal Society of Chemistry (1981)

Best Publications

  • Observation of the Infrared Spectrum of H 3

    Takeshi Oka

  • Detection of H + 3 in interstellar space

    T. R. Geballe;T. Oka

  • Calculation of inertia defect: Part I. General formulation

    Takeshi Oka;Yonezo Morino

  • HOT AND DIFFUSE CLOUDS NEAR THE GALACTIC CENTER PROBED BY METASTABLE H~3^+

    Takeshi Oka;Thomas R. Geballe;Miwa Goto;Tomonori Usuda

  • H3+ in Diffuse Interstellar Clouds: a Tracer for the Cosmic-Ray Ionization Rate

    Nick Indriolo;Thomas R. Geballe;Takeshi Oka;Benjamin J. McCall

  • Vibration—Rotation Interaction in Symmetric‐Top Molecules and the Splitting between A1 and A2 Levels

    Takeshi Oka

  • Collision-induced transitions between rotational levels

    Takeshi Oka

  • Hot and Diffuse Clouds near the Galactic Center Probed by Metastable H3

    Takeshi Oka;T. R. Geballe;Miwa Goto;Tomonori Usuda

  • CH5+: The Infrared Spectrum Observed

    Edmund T. White;Jian Tang;Takeshi Oka

  • The detection of HC 9 N in interstellar space.

    N. W. Broten;T. Oka;L. W. Avery;J. M. MacLeod

  • Detection of H3+ in the diffuse interstellar medium toward Cygnus OB2 No. 12.

    B. J. McCall;T. R. Geballe;K. H. Hinkle;T. Oka

  • Effect of vibration and rotation on the internuclear distance

    Masaharu Toyama;Takeshi Oka;Yonezo Morino

  • Millimeter Wave Spectrum of Formaldehyde

    Kojiro Takagi;Takeshi Oka

  • STUDIES OF THE DIFFUSE INTERSTELLAR BANDS. III. HD 183143

    L. M. Hobbs;D. G. York;J. A. Thorburn;J. A. Thorburn;T. P. Snow

  • Laser Stark spectroscopy in the 10 μm region: The ν3 bands of CH3F

    S.M. Freund;G. Duxbury;M. Römheld;J.T. Tiedje

  • A Catalog of Diffuse Interstellar Bands in the Spectrum of HD 204827

    L. M. Hobbs;D. G. York;T. P. Snow;T. Oka

  • Detection of the heavy interstellar molecule cyanodiacetylene.

    L. W. Avery;N. W. Broten;J. M. MacLeod;T. Oka

  • Interstellar H(3)(

    Takeshi Oka

  • Microwave Spectrum of Formaldehyde II. Molecular Structure in the Ground State

    Takeshi Oka

  • High-Resolution Spectroscopy of Solid Hydrogen

    T Oka

Frequent Co-Authors

Donald G. York
Donald G. York University of Chicago
Thomas R. Geballe
Thomas R. Geballe University of Hawaii at Manoa
Fabrizio Tavecchio
Fabrizio Tavecchio National Institute for Astrophysics
R. Carosi
R. Carosi University of Turin
Yonezo Morino
Yonezo Morino University of Tokyo

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