Krishnan Raghavachari

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{{Use Indian English|date=February 2023}}

{{short description| American chemist (born 1956)}}

{{Infobox scientist

| name = Krishnan Raghavachari

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| caption = Krishnan Raghavachari

| birth_date = {{birth date and age|df=y|1953|04|03}}

| birth_place = Chennai, Tamil Nadu, India

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| workplaces = Indiana University Bloomington{{cite web |title=Krishnan Raghavachari |url=https://www.chem.indiana.edu/faculty/krishnan-raghavachari/ |website=indiana.edu}}

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| education = BSc at University of Madras
MSc at Indian Institute of Technology Madras
PhD at Carnegie Mellon University

| alma_mater = Carnegie Mellon University
Indian Institute of Technology Madras

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| thesis_year = 1981

| doctoral_advisor = Sir John Anthony Pople

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| Quantum chemistry

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| awards = Davisson–Germer Prize in 2009

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Krishnan Raghavachari (born 3 April 1953, in Chennai, India) is a Professor of Chemistry at Indiana University Bloomington.

Raghavachari began his education in his native India, completing his undergraduate degree in 1973 at Madras University and his masters from the Indian Institute of Technology in 1975.{{Cite web|url=http://raghavachari.chem.indiana.edu/|title=Faculty + Research: Department of Chemistry: Indiana University Bloomington|website=raghavachari.chem.indiana.edu|language=en|access-date=2017-01-24}} Following this, he moved to the United States to attend Carnegie-Mellon University for his doctorate under the tutelage of John Pople, completing it in 1981. Upon completing his degree, Raghavachari entered the private sector as a research scientist at Bell Labs.{{Cite web|url=https://honorsandawards.iu.edu/search-awards/honoree.shtml?honoreeID=6612|title=Honoree: Search Awards: University Honors & Awards: Indiana University|website=honorsandawards.iu.edu|language=en|access-date=2017-01-24|archive-date=2 February 2017|archive-url=https://web.archive.org/web/20170202042911/https://honorsandawards.iu.edu/search-awards/honoree.shtml?honoreeID=6612|url-status=dead}} He served as a member of the technical staff until 1987 when he was named a distinguished member. In 2002, he joined the faculty at Indiana University.{{fact|date=February 2023}}

Raghavachari has been credited as one of the top quantum chemists in the United States and responsible for developing methods allowing for widespread use of computational chemistry. Among the methods he has developed over his career are CCSD(T), used to evaluate bond energies and the properties of molecules and the Gaussian-2, 3, and 4 methods. Over the course of his career, Raghavachari has given over 150 invited lectures, published over 320 scientific papers, and has been cited over 50,000 times by others in the field. He has also served as chair of the Theoretical Chemistry Subdivision of the American Chemical Society, on the editorial boards of the Journal of Physical Chemistry, Journal of Computational Chemistry, Theoretical Chemistry Accounts, and Journal of Materials Research.{{fact|date=February 2023}}