{"corpus_id":93812066,"paper_sha":"2fba4496d46ddfb721370585e94c4fc51ee319cc","doi":"10.1063/1.437915","arxiv_id":null,"pmid":null,"pmcid":null,"mag_id":1975487233,"dblp_id":null,"acl_id":null,"title":"NMR in rotating solids","year":1979,"publication_date":"1979-04-01","venue":"","journal":{"name":"Journal of Chemical Physics","pages":"3300-3316","volume":"70"},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":["Physics","Chemistry"],"reference_count":34,"citation_count":1140,"influential_citation_count":15,"is_open_access":false,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":null,"s2_open_access_landing_url":null,"s2_open_access_license":null,"s2_open_access_status":null,"pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"The NMR free induction decay from a spinning sample having inhomogeneous anisotropic interactions (chemical shifts, first order quadrupole couplings) takes the form of a train of rotational spin echoes. The Fourier transform of the echo envelope is a sharp spectrum from which the effects of anisotropy have been removed. The Fourier transform of the echo shape contains information concerning the anisotropies: This information can be extracted by a moment analysis. The effects of localized homonuclear spin–spin interactions are to convert the ’’isotropic’’ spectrum into a characteristic powder pattern. Second order quadrupole coupling produces a similar effect. It is shown in this case that the usual second-order level shifts cannot be used to calculated this pattern, which must be described by a proper average Hamiltonian theory. Finally it is shown that rotational spin echoes provide a convenient means of studying very slow random molecular rotations (τc≲1 sec).","claims":[{"public_id":"cl_225775dcbeceee6268da7f4e3235b191","status":"active","text":"Rotational spin echoes provide a convenient means of studying very slow random molecular rotations with τc ≲ 1 sec.","confidence":0.9,"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_225775dcbeceee6268da7f4e3235b191"},{"public_id":"cl_09e78dcb9bc9332828fc03c70512e3fc","status":"active","text":"Second order quadrupole coupling produces a similar powder pattern effect, and the usual second-order level shifts cannot be used to calculate this pattern, which must be described by a proper average 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