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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 72 5321 4833 317 296 993 16946

Eizi Hirota publications per year

The chart shows the history of publications by Eizi Hirota between 1953 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Eizi Hirota published across 73 years, from 1953 to 2025, averaging 14 papers a year. Output peaked at 578 publications in 2014. 2 of the 1,020 publications appeared in the last two years.

No. of publications
100 200 300 400 500
Bar chart. Horizontal axis: year, 1953 to 2025. Vertical axis: number of publications, 0 to 578. Peak 578 publications in 2014. 1953: 1 publication 1954: 1 publication 1955: 1 publication 1956: 0 publications 1957: 0 publications 1958: 6 publications 1959: 1 publication 1960: 2 publications 1961: 3 publications 1962: 3 publications 1963: 0 publications 1964: 3 publications 1965: 1 publication 1966: 3 publications 1967: 2 publications 1968: 6 publications 1969: 2 publications 1970: 10 publications 1971: 6 publications 1972: 8 publications 1973: 2 publications 1974: 4 publications 1975: 7 publications 1976: 7 publications 1977: 11 publications 1978: 5 publications 1979: 7 publications 1980: 14 publications 1981: 15 publications 1982: 16 publications 1983: 27 publications 1984: 22 publications 1985: 34 publications 1986: 26 publications 1987: 20 publications 1988: 28 publications 1989: 18 publications 1990: 13 publications 1991: 8 publications 1992: 10 publications 1993: 6 publications 1994: 7 publications 1995: 7 publications 1996: 3 publications 1997: 5 publications 1998: 4 publications 1999: 6 publications 2000: 1 publication 2001: 2 publications 2002: 3 publications 2003: 2 publications 2004: 1 publication 2005: 2 publications 2006: 4 publications 2007: 2 publications 2008: 1 publication 2009: 2 publications 2010: 5 publications 2011: 1 publication 2012: 2 publications 2013: 2 publications 2014: 578 publications 2015: 4 publications 2016: 5 publications 2017: 3 publications 2018: 2 publications 2019: 0 publications 2020: 0 publications 2021: 2 publications 2022: 1 publication 2023: 2 publications 2024: 0 publications 2025: 2 publications
1953 2025

1,020 publications in total across all disciplines

View publications per year as a table
Eizi Hirota: publications per year, 1953 to 2025
Year Publications
1953 1
1954 1
1955 1
1956 0
1957 0
1958 6
1959 1
1960 2
1961 3
1962 3
1963 0
1964 3
1965 1
1966 3
1967 2
1968 6
1969 2
1970 10
1971 6
1972 8
1973 2
1974 4
1975 7
1976 7
1977 11
1978 5
1979 7
1980 14
1981 15
1982 16
1983 27
1984 22
1985 34
1986 26
1987 20
1988 28
1989 18
1990 13
1991 8
1992 10
1993 6
1994 7
1995 7
1996 3
1997 5
1998 4
1999 6
2000 1
2001 2
2002 3
2003 2
2004 1
2005 2
2006 4
2007 2
2008 1
2009 2
2010 5
2011 1
2012 2
2013 2
2014 578
2015 4
2016 5
2017 3
2018 2
2019 0
2020 0
2021 2
2022 1
2023 2
2024 0
2025 2
Total 1,020
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Eizi Hirota 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 Eizi Hirota sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 981–1,000 publications, is where this scientist sits. 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
61–80 publications 1,295+

This scientist: 993 publications — 99th percentile

99% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15 993
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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Eizi Hirota 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 Eizi Hirota sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 72–73 D-Index, is where this scientist sits. 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
40–41 D-Index 159+

This scientist: 72 D-Index — 71st percentile

71% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561 72
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Overview

Eizi Hirota is affiliated with The Graduate University for Advanced Studies, SOKENDAI in Japan. Their research spans multiple fields, primarily focused on Chemistry and Physics and Astronomy, with notable work in spectroscopy and molecular physics.

The scientist's research extensively covers the areas of Spectroscopy, Astronomy and Astrophysics, Atomic and Molecular Physics and Optics, Atmospheric Science, and Cardiovascular Medicine. Their work intersects with several specialized topics, including Molecular Spectroscopy and Structure, Advanced Chemical Physics Studies, Astrophysics and Star Formation Studies, Atmospheric Ozone and Climate, Origins and Evolution of Life, SAS software applications and methods, and Spectroscopy and Laser Applications.

Recent publications by Eizi Hirota highlight a concentration on molecular spectroscopy and astrochemical phenomena. Notable papers include:

  • Precursors of fatty alcohols in the ISM: Discovery of n-propanol, 2022, Astronomy and Astrophysics
  • Conformations and Low-Frequency Intramolecular Motions of 1-Butanol, 1-Butanethiol, Iso-butanol, and Iso-butanethiol Investigated by Fourier Transform Microwave Spectroscopy Combined with Quantum Chemical Calculations, 2021, The Journal of Physical Chemistry A
  • Precursors of fatty alcohols in the ISM: Discovery of n-propanol, 2022, arXiv (Cornell University)
  • The conformational behavior of N-ethylformamide as observed by rotational spectroscopy and quantum chemistry, 2023, Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
  • Collection of memories of Jon T. Hougen, 2020, Journal of Molecular Structure

These papers indicate a consistent engagement with molecular structure analysis using spectroscopic techniques, often combined with quantum chemical calculations to explore the conformational properties of organic molecules and their implications in interstellar media.

Eizi Hirota collaborates frequently with several researchers, indicating a strong network within their research community. Frequent coauthors include:

  • Yoshiyuki Kawashima
  • I. Jiménez-Serra
  • J. Martín-Pintado
  • V. M. Rivilla
  • Mattia Melosso

The primary venues where Hirota's work has appeared are:

  • Journal of Molecular Spectroscopy
  • Astronomy and Astrophysics
  • The Journal of Physical Chemistry A
  • Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
  • arXiv (Cornell University)

The research profile indicates a focus on understanding molecular interactions and structures relevant to both terrestrial and interstellar environments. Analytical approaches combining spectroscopic experimentation and theoretical calculations are a hallmark of their contributions.

Best Publications

  • DIODE LASER STUDY OF THE ν2 BAND OF THE METHYL RADICAL

    C. Yamada;E. Hirota;K. Kawaguchi

  • Molecular structure and internal motion of formamide from microwave spectrum

    Eizi Hirota;Ryoka Sugisaki;Claus Jørgen Nielsen;Georg Ole Sørensen

  • Microwave spectrum and rotational isomerism in butene-1

    Shigeo Kondo;Eizi Hirota;Yonezo Morino

  • Equilibrium structure and potential function of sulfur dioxide from the microwave spectrum in the excited vibrational state

    Yonezo Morino;Yoshikazu Kikuchi;Shuji Saito;Eizi Hirota

  • Spatial Distribution of SiH3 Radicals in RF Silane Plasma

    Naoshi Itabashi;Nobuki Nishiwaki;Mitsuo Magane;Susumu Naito

  • Rotational Isomerism and Microwave Spectroscopy. I. The Microwave Spectrum of Normal Propyl Fluoride

    Eizi Hirota

  • Rotational Isomerism and Microwave Spectroscopy. III. The Microwave Spectrum of 3‐Fluoropropene

    Eizi Hirota

  • The microwave spectrum of the methoxy radical CH3O

    Yasuki Endo;Shuji Saito;Eizi Hirota

  • Mean Amplitudes of Thermal Vibrations in Polyatomic Molecules. III. The Generalized Mean Amplitudes

    Yonezo Morino;Eizi Hirota

  • Microwave Spectra, Hyperfine Structure, and Electric Dipole Moments for Conformers I and II of Glycine

    Francis J. Lovas;Y Kawashima;J U. Grabow;R D. Suenram

  • Infrared diode laser spectroscopy of the NO3 ν3 band

    Takashi Ishiwata;Ikuzo Tanaka;Kentarou Kawaguchi;Eizi Hirota

  • Diode laser spectroscopy of the ν3 and ν2 bands of FHF− in 1300 cm−1 region

    Kentarou Kawaguchi;Eizi Hirota

  • Molecular Structure and Internal Rotation of Hexachloroethane, Hexachlorodisilane, and Trichloromethyl‐Trichlorosilane

    Yonezo Morino;Eizi Hirota

  • Difference frequency laser spectroscopy of the ν3 band of the CH3 radical

    Takayoshi Amano;P. F. Bernath;C. Yamada;Y. Endo

  • MICROWAVE SPECTRA OF THE HSO AND DSO RADICALS

    Y. Endo;S. Saito;E. Hirota

  • The submillimeter‐wave spectrum of the HCCO radical

    Yasuki Endo;Eizi Hirota

  • Microwave spectra of deuterated ethanes: Internal rotation potential function and rz structure

    Eizi Hirota;Yasuki Endo;Shuji Saito;J.L. Duncan

  • Microwave spectra of deuterated ethylenes: Dipole moment and rz structure

    Eizi Hirota;Yasuki Endo;Shuji Saito;Kazuhiko Yoshida

  • Infrared diode laser study of the hydrogen bifluoride anion: FHF− and FDF−

    Kentarou Kawaguchi;Eizi Hirota

  • Vibrational distribution of CH3 produced by the reaction of O(1D2) atom with CH4

    Toshinori Suzuki;Eizi Hirota

Frequent Co-Authors

Kentarou Kawaguchi
Kentarou Kawaguchi Okayama University
Yasuki Endo
Yasuki Endo National Yang Ming Chiao Tung University
Yonezo Morino
Yonezo Morino University of Tokyo
James E. Butler
James E. Butler Euclid TechLabs, LLC
Toshio Goto
Toshio Goto Nagoya University
Peter F. Bernath
Peter F. Bernath Old Dominion University
Takaharu Onishi
Takaharu Onishi University of Tokyo
Akihisa Matsuda
Akihisa Matsuda National Institute of Advanced Industrial Science and Technology
Terry A. Miller
Terry A. Miller The Ohio State University
Claus J. Nielsen
Claus J. Nielsen University of Oslo

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