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Lett.<\/jats:italic>, <jats:bold>194<\/jats:bold>, 84 (1992)] is extended to allow four\u2010indexed quantities containing one or two indices in the virtual orbital space to be stored across the global memory of distributed\u2010memory parallel processors. Quantities such as the double\u2010excitation amplitudes can now be distributed over multiple nodes, with blocks of data retrieved from remote nodes by the use of interrupt handlers. As an application of the new code, we have investigated the potential energy surface of the 2\u2010hydroxypyridine\/2\u2010pyridone tautomers. Using large basis sets, the structure of each tautomer and the transition state connecting the two minima has been determined at the SCF level. The relative energy difference and the activation energy were then redetermined using the MP2, CCSD, and CCSD(T) methods. All calculations have been performed on Intel distributed\u2010memory supercomputers. The largest coupled\u2010cluster calculations contained over 2 million double\u2010excitation amplitudes. \u00a9 John Wiley &amp; Sons, Inc.<\/jats:p>","DOI":"10.1002\/jcc.540141204","type":"journal-article","created":{"date-parts":[[2005,1,2]],"date-time":"2005-01-02T00:59:49Z","timestamp":1104627589000},"page":"1429-1439","source":"Crossref","is-referenced-by-count":43,"title":["Distributed data parallel coupled\u2010cluster algorithm: Application to the 2\u2010hydroxypyridine\/2\u2010pyridone tautomerism"],"prefix":"10.1002","volume":"14","author":[{"given":"Alistair P.","family":"Rendell","sequence":"first","affiliation":[]},{"given":"Martyn F.","family":"Guest","sequence":"additional","affiliation":[]},{"given":"Rick A.","family":"Kendall","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2004,9,7]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1063\/1.452116"},{"key":"e_1_2_1_3_2","first-page":"167","volume-title":"Methods in Computational Chemistry","author":"Colvin M.E.","year":"1989"},{"key":"e_1_2_1_4_2","unstructured":"M.F.Guest P.Sherwood andR.J.Harrison Comp. 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