Science Citation Index Expanded

The Science Citation Index Expanded – previously entitled Science Citation Index – is a citation index originally produced by the Institute for Scientific Information (ISI) and created by Eugene Garfield. It was officially launched in 1964 and is now owned by Clarivate (previously the Intellectual Property and Science business of Thomson Reuters).[1][2][3][4][5] The indexing database covers more than 9,200 notable and significant journals, across 178 disciplines, from 1900 to the present. These are alternatively described as the world's leading journals of science and technology, because of a rigorous selection process.[6][7][8]

Science Citation Index Expanded
ProducerClarivate (Canada and Hong Kong)
DisciplinesScience, medicine, and technology
Print edition


The index is available online within Web of Science,[9][10] as part of its Core Collection (there are also CD and printed editions, covering a smaller number of journals).[11] The database allows researchers to search through over 53 million records from thousands of academic journals that were published by publishers from around the world.

Chemistry Citation Index

Clarivate previously marketed several subsets of this database, termed "Specialty Citation Indexes",[12] such as the Neuroscience Citation Index[13] and the Chemistry Citation Index,[14] however these databases are no longer actively maintained.

The Chemistry Citation Index was first introduced by Eugene Garfield, a chemist by training. His original "search examples were based on [his] experience as a chemist".[15] In 1992, an electronic and print form of the index was derived from a core of 330 chemistry journals, within which all areas were covered. Additional information was provided from articles selected from 4,000 other journals. All chemistry subdisciplines were covered: organic, inorganic, analytical, physical chemistry, polymer, computational, organometallic, materials chemistry, and electrochemistry.[15]

By 2002, the core journal coverage increased to 500 and related article coverage increased to 8,000 other journals.[16]

One 1980 study reported the overall citation indexing benefits for chemistry, examining the use of citations as a tool for the study of the sociology of chemistry and illustrating the use of citation data to "observe" chemistry subfields over time.[17]

See also


  1. Garfield, E. (1955). "Citation Indexes for Science: A New Dimension in Documentation through Association of Ideas". Science. 122 (3159): 108–11. Bibcode:1955Sci...122..108G. doi:10.1126/science.122.3159.108. PMID 14385826.
  2. Garfield, Eugene (2011). "The evolution of the Science Citation Index" (PDF). International Microbiology. 10 (1): 65–9. doi:10.2436/20.1501.01.10. PMID 17407063.
  3. Garfield, Eugene (1963). "Science Citation Index" (PDF). Science Citation Index 1961. 1: v–xvi. Retrieved 2013-05-27.
  4. "History of Citation Indexing". Clarivate Analytics. November 2010. Retrieved 2010-11-04.
  5. "SCIE". Web of Science Group. Retrieved 2022-01-26.
  6. "Science Citation Index Expanded". Retrieved 2017-01-17.
  7. Ma, Jiupeng; Fu, Hui-Zhen; Ho, Yuh-Shan (December 2012). "The Top-cited Wetland Articles in Science Citation Index Expanded: characteristics and hotspots". Environmental Earth Sciences. 70 (3): 1039. Bibcode:2009EnGeo..56.1247D. doi:10.1007/s12665-012-2193-y. S2CID 18502338.
  8. Ho, Yuh-Shan (2012). "The top-cited research works in the Science Citation Index Expanded" (PDF). Scientometrics. 94 (3): 1297. doi:10.1007/s11192-012-0837-z. S2CID 1301373.
  9. "Available databases A to Z". Thomson Reuters. 2010. Retrieved 2010-06-24.
  10. Thomson Reuters Web of Knowledge. Thomson Reuters, 2013.
  11. "Trusted publisher-independent citation database". Web of Science Group. Retrieved 2022-01-26.
  12. "Specialty Citation Indexes". Archived from the original on 2010-01-04. Retrieved 2009-08-30.
  13. "Journal Search – Science". Retrieved 2009-08-30.
  14. "Journal Search – Science – Thomson Reuters". Retrieved 14 January 2011.
  15. Garfield, Eugene (1992). "New Chemistry Citation Index On CD-ROM Comes With Abstracts, Related Records, and Key-Words-Plus" (PDF). Current Contents. 3: 5–9.
  16. Chemistry Citation Index. Institute of Process Engineering of the Chinese Academy of Sciences. 2003.
  17. Dewitt, T. W.; Nicholson, R. S.; Wilson, M. K. (1980). "Science citation index and chemistry". Scientometrics. 2 (4): 265. doi:10.1007/BF02016348. S2CID 8382186.

Further reading

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