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D-Index & Metrics

Chemistry

D-Index
72
Citations
17364
World Ranking
5295
National Ranking
1652

Physics

D-Index
79
Citations
19764
World Ranking
3107
National Ranking
1488

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.

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 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.

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.

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 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.

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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