{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T22:42:38Z","timestamp":1791153758827,"version":"4.1.0"},"reference-count":37,"publisher":"AIP Publishing","issue":"14","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2011,10,14]]},"abstract":"<jats:p>We present a method for selectively exciting nuclear magnetic resonances (NMRs) from well-defined subsets of crystallites from a powdered sample under magic angle spinning. Magic angle spinning induces a time dependence in the anisotropic interactions, which results in a time variation of the resonance frequencies which is different for different crystallite orientations. The proposed method exploits this by applying selective pulses, which we refer to as XS (for crystallite-selective) pulses, that follow the resonance frequencies of nuclear species within particular crystallites, resulting in the induced flip angle being orientation dependent. By selecting the radiofrequency field to deliver a 180\u2009\u25cb pulse for the target orientation and employing a train of such pulses combined with cogwheel phase cycling, we obtain a high degree of orientational selectivity with the resulting spectrum containing only contributions from orientations close to the target. Typically, this leads to the selection of between 0.1% and 10% of the crystallites, and in extreme cases to the excitation of a single orientation resulting in single crystal spectra of spinning powders. Two formulations of this method are described and demonstrated with experimental examples on [1 \u2212 13C]-alanine and the paramagnetic compound Sm2Sn2O7.<\/jats:p>","DOI":"10.1063\/1.3640418","type":"journal-article","created":{"date-parts":[[2011,10,10]],"date-time":"2011-10-10T22:34:55Z","timestamp":1318286095000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":18,"title":["Single crystal nuclear magnetic resonance in spinning powders"],"prefix":"10.1063","volume":"135","author":[{"given":"Andrew J.","family":"Pell","sequence":"first","affiliation":[{"name":"Universit\u00e9 de Lyon , Centre de RMN \u00e0 Tr\u00e8s Hauts Champs, CNRS\/Ecole Normale Sup\u00e9rieure de Lyon\/Universit\u00e9 Claude Bernard Lyon 1, 5 rue de la Doua, 69100 Villeurbanne, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guido","family":"Pintacuda","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Lyon , Centre de RMN \u00e0 Tr\u00e8s Hauts Champs, CNRS\/Ecole Normale Sup\u00e9rieure de Lyon\/Universit\u00e9 Claude Bernard Lyon 1, 5 rue de la Doua, 69100 Villeurbanne, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lyndon","family":"Emsley","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Lyon , Centre de RMN \u00e0 Tr\u00e8s Hauts Champs, CNRS\/Ecole Normale Sup\u00e9rieure de Lyon\/Universit\u00e9 Claude Bernard Lyon 1, 5 rue de la Doua, 69100 Villeurbanne, France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2011,10,10]]},"reference":[{"key":"2023062522362091500_c1","volume-title":"Multidimensional Solid-State NMR and Polymers","year":"1994"},{"key":"2023062522362091500_c2","volume-title":"Principles of High-Resolution NMR in Solids","year":"1983"},{"key":"2023062522362091500_c3","doi-asserted-by":"publisher","first-page":"3300","DOI":"10.1063\/1.437915","volume":"70","year":"1979","journal-title":"J. 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