Top institutions in physics by impact

Data provided by Thomson Scientific from its Essential Science Indicators, 1 January 1998–29 February 2008

July 10, 2008

 Scientist Papers CitationsCitations per paper
1 IBM Corporation Global2,372 58,086 24.49
2 Boston University USA2,399 56,652 23.61
3 University of Pennsylvania USA2,246 52,163 23.22
4 Harvard University USA4,045 88,605 21.90
5 Stanford University USA5,330 114,965 21.57
6 University of California, Santa Barbara USA4,660 99,081 21.26
7Cornell University USA3,131 66,340 21.19
8 University of Washington USA3,077 64,886 21.09
9 Caltech USA4,193 88,325 21.06
10 Princeton University USA5,094 104,574 20.53
11Brookhaven National Laboratory USA4,098 83,623 20.41
12 Massachusetts Institute of Technology USA7,602 150,715 19.83
13 University of Minnesota USA2,705 51,846 19.17
14 University of California, Berkeley USA7,226 129,223 17.88
15 Cern Switzerland6,323 109,121 17.26
16 University of California, San Diego USA4,249 71,428 16.81
17 Ohio State University USA3,141 52,668 16.77
18 National Inst of Standards and Technology USA 4,004 64,046 16.00
19 Argonne National Laboratory USA5,325 83,313 15.65
20 University of California, Los Angeles USA4,222 65,246 15.45
This analysis reveals a strong per paper performance by US institutions, which take 18 of the first 20 ranks. IBM is considered a multinational entity; Cern is the other institution represented in the top 20. Essential Science Indicators lists institutions ranked in the top 1 per cent for a field over a given period, based on total citations. For the current version, 629 institutions are listed in the field of physics, meaning that a total of 62,900 institutions were reviewed to obtain these results. Of the 629, 49 institutions collected 50,000 or more citations. The ranking by citations per paper (impact) seeks to reveal “heavy-hitters” based on per paper influence, not mere output.

The data above were extracted from Thomson Scientific’s Essential Science Indicators database. This database, currently covering the period January 1998 to February 2008, surveys only journal articles

(original research reports and review articles) indexed by Thomson Scientific. Articles are assigned to a category based on the journals in which they were published and Thomson Scientific’s journal-to-category field definition scheme. Both articles tabulated and citation counts to those articles are for the period indicated. Naturally, institutions publishing large numbers of papers have a greater likelihood of collecting more citations than those publishing fewer papers. This ranking is by citations per paper (impact), among those institutions that have collected 50,000 or more citations in physics. For papers with multiple institutional addresses, each institution receives full, not fractional, citation credit.

For more information on Thomson Scientific’s Essential Science Indicators, see http://scientific.thomson.com/products/esi. Also see: http://scientific.thomson.com.

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