FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1566736699> ?p ?o ?g. }

• W1566736699 endingPage "2893" @default.
• W1566736699 startingPage "2877" @default.
• W1566736699 abstract "Spin-lattice relaxation processes in 13CH3 groups in methyl compounds are studied both theoretically and experimentally. The four spin-½ nuclei in such methyl groups give rise to 16 spin-rotational states, which are split by rotational tunnelling. From the corresponding populations (15 independent) five long lived combinations are formed: the 13C magnetization M C, proton magnetization M H, tunnelling energy TE, rotational polarization RP and dipolar energy DE. Their spin-lattice relaxation via the transitions induced by the 13C-proton dipolar interaction is studied in detail. Direct relaxation rates and coupling terms between these combinations are derived. Predictions are compared with experimental data for 13C spin-lattice relaxation at 75.4 MHz in 99% enriched (only methyl carbons enriched) single crystal of aspirin. Above 40 K, the M C recovery is exponential and describable in terms of the direct relaxation transitions without couplings. The same is true for the initial relaxation in the region of non-exponential relaxation between 30 K and 40 K. The orientation dependence of the initial relaxation rate agrees with the theoretical calculations. The non-exponentiality is related to resonant level-crossing transitions with ωt, + ωC = ωH, where the angular frequencies represent rotational tunnelling and carbon and proton resonances, respectively. The resonant transitions produce couplings between M C, M H and TE that are described quite accurately by the present model." @default.
• W1566736699 created "2016-06-24" @default.
• W1566736699 creator A5018724379 @default.
• W1566736699 creator A5038250848 @default.
• W1566736699 creator A5066579049 @default.
• W1566736699 date "2002-09-10" @default.
• W1566736699 modified "2023-10-16" @default.
• W1566736699 title "Spin-lattice relaxation in¹³CH₃compounds: application to¹³C enriched aspirin" @default.
• W1566736699 cites W1966452882 @default.
• W1566736699 cites W1966690290 @default.
• W1566736699 cites W1967567414 @default.
• W1566736699 cites W1975502352 @default.
• W1566736699 cites W1976940990 @default.
• W1566736699 cites W1985362210 @default.
• W1566736699 cites W1994581241 @default.
• W1566736699 cites W2000703905 @default.
• W1566736699 cites W2001478252 @default.
• W1566736699 cites W2009965713 @default.
• W1566736699 cites W2010975520 @default.
• W1566736699 cites W2016236271 @default.
• W1566736699 cites W2017742387 @default.
• W1566736699 cites W2018015811 @default.
• W1566736699 cites W2038535816 @default.
• W1566736699 cites W2044940918 @default.
• W1566736699 cites W2046353167 @default.
• W1566736699 cites W2053841171 @default.
• W1566736699 cites W2069074819 @default.
• W1566736699 cites W2070248449 @default.
• W1566736699 cites W2078906233 @default.
• W1566736699 cites W2080038941 @default.
• W1566736699 cites W2082658606 @default.
• W1566736699 cites W2090888161 @default.
• W1566736699 cites W4254908075 @default.
• W1566736699 cites W1963772617 @default.
• W1566736699 doi "https://doi.org/10.1080/00268970210123955" @default.
• W1566736699 hasPublicationYear "2002" @default.
• W1566736699 type Work @default.
• W1566736699 sameAs 1566736699 @default.
• W1566736699 citedByCount "14" @default.
• W1566736699 countsByYear W15667366992012 @default.
• W1566736699 countsByYear W15667366992013 @default.
• W1566736699 countsByYear W15667366992015 @default.
• W1566736699 countsByYear W15667366992018 @default.
• W1566736699 crossrefType "journal-article" @default.
• W1566736699 hasAuthorship W1566736699A5018724379 @default.
• W1566736699 hasAuthorship W1566736699A5038250848 @default.
• W1566736699 hasAuthorship W1566736699A5066579049 @default.
• W1566736699 hasConcept C115260700 @default.
• W1566736699 hasConcept C120398109 @default.
• W1566736699 hasConcept C121332964 @default.
• W1566736699 hasConcept C150077920 @default.
• W1566736699 hasConcept C15744967 @default.
• W1566736699 hasConcept C173523689 @default.
• W1566736699 hasConcept C178790620 @default.
• W1566736699 hasConcept C184779094 @default.
• W1566736699 hasConcept C185592680 @default.
• W1566736699 hasConcept C24890656 @default.
• W1566736699 hasConcept C26873012 @default.
• W1566736699 hasConcept C2776029896 @default.
• W1566736699 hasConcept C2781204021 @default.
• W1566736699 hasConcept C32546565 @default.
• W1566736699 hasConcept C36703968 @default.
• W1566736699 hasConcept C41999313 @default.
• W1566736699 hasConcept C54516573 @default.
• W1566736699 hasConcept C62520636 @default.
• W1566736699 hasConcept C77805123 @default.
• W1566736699 hasConceptScore W1566736699C115260700 @default.
• W1566736699 hasConceptScore W1566736699C120398109 @default.
• W1566736699 hasConceptScore W1566736699C121332964 @default.
• W1566736699 hasConceptScore W1566736699C150077920 @default.
• W1566736699 hasConceptScore W1566736699C15744967 @default.
• W1566736699 hasConceptScore W1566736699C173523689 @default.
• W1566736699 hasConceptScore W1566736699C178790620 @default.
• W1566736699 hasConceptScore W1566736699C184779094 @default.
• W1566736699 hasConceptScore W1566736699C185592680 @default.
• W1566736699 hasConceptScore W1566736699C24890656 @default.
• W1566736699 hasConceptScore W1566736699C26873012 @default.
• W1566736699 hasConceptScore W1566736699C2776029896 @default.
• W1566736699 hasConceptScore W1566736699C2781204021 @default.
• W1566736699 hasConceptScore W1566736699C32546565 @default.
• W1566736699 hasConceptScore W1566736699C36703968 @default.
• W1566736699 hasConceptScore W1566736699C41999313 @default.
• W1566736699 hasConceptScore W1566736699C54516573 @default.
• W1566736699 hasConceptScore W1566736699C62520636 @default.
• W1566736699 hasConceptScore W1566736699C77805123 @default.
• W1566736699 hasIssue "17" @default.
• W1566736699 hasLocation W15667366991 @default.
• W1566736699 hasOpenAccess W1566736699 @default.
• W1566736699 hasPrimaryLocation W15667366991 @default.
• W1566736699 hasRelatedWork W1973890312 @default.
• W1566736699 hasRelatedWork W1973895505 @default.
• W1566736699 hasRelatedWork W1984190371 @default.
• W1566736699 hasRelatedWork W2000521348 @default.
• W1566736699 hasRelatedWork W2005261873 @default.
• W1566736699 hasRelatedWork W2031312721 @default.
• W1566736699 hasRelatedWork W2056236589 @default.
• W1566736699 hasRelatedWork W2327880555 @default.
• W1566736699 hasRelatedWork W2071498061 @default.

• next