{"term":{"id":"05409","doi":"10.1351\/goldbook.R05409","code":"R05409","status":"current","longtitle":"IUPAC Gold Book - rotational constants","title":"rotational constants","version":"2.3.3","lastupdated":"2014-02-24","definitions":[{"id":"1","text":"Coefficients of quantum numbers in the rotational term expression and inversely proportional to the principal moments of inertia. Symbols: A, B, C. A(tilde) = h8π2.c.IA (dimension wavenumber), A = h\/8π^2.IA (dimension frequency) where h is the Planck constant and c the speed of light in vacuum.","links":[{"title":"term","type":"internal","url":"https:\/\/goldbook.iupac.org\/terms\/view\/T06272"},{"title":"principal moments of inertia","type":"internal","url":"https:\/\/goldbook.iupac.org\/terms\/view\/P04848"},{"title":"Planck constant","type":"goldify","url":"https:\/\/goldbook.iupac.org\/terms\/view\/P04685"}],"math":[{"alttext":"A","latex":"A"},{"alttext":"B","latex":"B"},{"alttext":"C","latex":"C"},{"alttext":"A(tilde) = h8π2.c.IA","latex":"\\overset{˜}{A}=\\frac{h}{8\\ \\pi ^{2}\\ c\\ I_{\\text{A}}}"},{"meaning":"Dimension frequency","type":"equation","alttext":"A = h\/8π^2.IA","latex":"A=\\frac{h}{8\\ \\pi ^{2}\\ I_{\\text{A}}}"},{"alttext":"h","latex":"h"},{"alttext":"c","latex":"c"}],"sources":["Green Book, 2nd ed., p. 23 (https:\/\/goldbook.iupac.org\/files\/pdf\/green_book_2ed.pdf)"]}],"links":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/R05409\/html","json":"https:\/\/goldbook.iupac.org\/terms\/view\/R05409\/json","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/R05409\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/R05409\/plain","pdf":"https:\/\/goldbook.iupac.org\/terms\/view\/R05409\/pdf"},"citeas":"IUPAC. Compendium of Chemical Terminology, 2nd ed. (the \"Gold Book\"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https:\/\/doi.org\/10.1351\/goldbook.","license":"Licensed under Creative Commons Attribution-NoDerivatives (CC BY-NC-ND) 4.0 International (https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/)","collection_reuse":"For parties interested in reusing the entire IUPAC Gold Book please contact IUPAC here https:\/\/www.cognitoforms.com\/IUPAC1\/ContactInformationForm","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2023-05-31T15:30:35+00:00"}}