Matches in SemOpenAlex for { <https://semopenalex.org/work/W2032697640> ?p ?o ?g. }
Showing items 1 to 88 of
88
with 100 items per page.
- W2032697640 endingPage "4099" @default.
- W2032697640 startingPage "4090" @default.
- W2032697640 abstract "The dynamic nuclear polarization of 13C nuclei in a suite of seven natural type Ia and Ib diamonds, using continuous wave S- and X-band microwave radiation, is described. The 13C signal enhancement and polarization time have been measured for one of the type Ib diamonds as a function of magnetic field in the vicinity of the resonance field. The total paramagnetic impurity concentration (P1 and other centers) in this diamond is 2×1018 cm−3 (23 atomic parts per million), while the concentration of P1 centers is 9.3 ppm. Since the central electron spin resonance (ESR) linewidth HL is comparable with H0γC/γe, flip–flip and flip–flop forbidden transitions take place simultaneously. Consequently thermal mixing plays an important role in the 13C signal enhancement. However, the 13C spin-lattice relaxation rate is determined to a large extent by the solid state effect (forbidden transitions). The 13C polarization rates have been measured for the suite of diamonds by executing dynamic nuclear polarization (DNP) experiments on both hyperfine and central ESR lines. It is shown that the polarization rate is proportional to the paramagnetic impurity concentration of the sample, in agreement with the existing theory. It has been found that in type Ib diamonds with relatively low nitrogen impurity concentrations the dynamic nuclear polarization of a single hyperfine line yields an equilibrium 13C polarization that is one-quarter of that obtained in the case of dynamic nuclear polarization of the central line. In samples containing P1 and P2 centers (type Ia), or in type Ib samples with relatively high concentrations of P1 centers, the same equilibrium 13C polarization is obtained for the DNP of hyperfine and central transitions. This phenomenon is explained in terms of a model in which thermal contact is established between the electron Zeeman reservoir and the nuclear spin reservoirs via the spin–spin interaction reservoir if HL⩾H0γC/γe." @default.
- W2032697640 created "2016-06-24" @default.
- W2032697640 creator A5003899528 @default.
- W2032697640 creator A5006417863 @default.
- W2032697640 date "1998-09-08" @default.
- W2032697640 modified "2023-10-07" @default.
- W2032697640 title "Dynamic nuclear polarization of diamond. I. Solid state and thermal mixing effects" @default.
- W2032697640 cites W1967350699 @default.
- W2032697640 cites W1974372976 @default.
- W2032697640 cites W1999437886 @default.
- W2032697640 cites W2019362726 @default.
- W2032697640 cites W2021132960 @default.
- W2032697640 cites W2087552351 @default.
- W2032697640 cites W2101812496 @default.
- W2032697640 cites W3009281913 @default.
- W2032697640 doi "https://doi.org/10.1063/1.477009" @default.
- W2032697640 hasPublicationYear "1998" @default.
- W2032697640 type Work @default.
- W2032697640 sameAs 2032697640 @default.
- W2032697640 citedByCount "37" @default.
- W2032697640 countsByYear W20326976402012 @default.
- W2032697640 countsByYear W20326976402013 @default.
- W2032697640 countsByYear W20326976402014 @default.
- W2032697640 countsByYear W20326976402015 @default.
- W2032697640 countsByYear W20326976402016 @default.
- W2032697640 countsByYear W20326976402017 @default.
- W2032697640 countsByYear W20326976402018 @default.
- W2032697640 countsByYear W20326976402019 @default.
- W2032697640 countsByYear W20326976402020 @default.
- W2032697640 countsByYear W20326976402021 @default.
- W2032697640 countsByYear W20326976402022 @default.
- W2032697640 countsByYear W20326976402023 @default.
- W2032697640 crossrefType "journal-article" @default.
- W2032697640 hasAuthorship W2032697640A5003899528 @default.
- W2032697640 hasAuthorship W2032697640A5006417863 @default.
- W2032697640 hasConcept C113196181 @default.
- W2032697640 hasConcept C120665830 @default.
- W2032697640 hasConcept C121332964 @default.
- W2032697640 hasConcept C124712363 @default.
- W2032697640 hasConcept C131538251 @default.
- W2032697640 hasConcept C142181693 @default.
- W2032697640 hasConcept C147789679 @default.
- W2032697640 hasConcept C178790620 @default.
- W2032697640 hasConcept C184779094 @default.
- W2032697640 hasConcept C185592680 @default.
- W2032697640 hasConcept C205049153 @default.
- W2032697640 hasConcept C26873012 @default.
- W2032697640 hasConcept C2776921476 @default.
- W2032697640 hasConcept C43617362 @default.
- W2032697640 hasConcept C520434653 @default.
- W2032697640 hasConcept C71987851 @default.
- W2032697640 hasConceptScore W2032697640C113196181 @default.
- W2032697640 hasConceptScore W2032697640C120665830 @default.
- W2032697640 hasConceptScore W2032697640C121332964 @default.
- W2032697640 hasConceptScore W2032697640C124712363 @default.
- W2032697640 hasConceptScore W2032697640C131538251 @default.
- W2032697640 hasConceptScore W2032697640C142181693 @default.
- W2032697640 hasConceptScore W2032697640C147789679 @default.
- W2032697640 hasConceptScore W2032697640C178790620 @default.
- W2032697640 hasConceptScore W2032697640C184779094 @default.
- W2032697640 hasConceptScore W2032697640C185592680 @default.
- W2032697640 hasConceptScore W2032697640C205049153 @default.
- W2032697640 hasConceptScore W2032697640C26873012 @default.
- W2032697640 hasConceptScore W2032697640C2776921476 @default.
- W2032697640 hasConceptScore W2032697640C43617362 @default.
- W2032697640 hasConceptScore W2032697640C520434653 @default.
- W2032697640 hasConceptScore W2032697640C71987851 @default.
- W2032697640 hasIssue "10" @default.
- W2032697640 hasLocation W20326976401 @default.
- W2032697640 hasOpenAccess W2032697640 @default.
- W2032697640 hasPrimaryLocation W20326976401 @default.
- W2032697640 hasRelatedWork W2004658011 @default.
- W2032697640 hasRelatedWork W2005368310 @default.
- W2032697640 hasRelatedWork W2005480629 @default.
- W2032697640 hasRelatedWork W2008891529 @default.
- W2032697640 hasRelatedWork W2009672919 @default.
- W2032697640 hasRelatedWork W2033200164 @default.
- W2032697640 hasRelatedWork W2044771586 @default.
- W2032697640 hasRelatedWork W2110086951 @default.
- W2032697640 hasRelatedWork W2257290860 @default.
- W2032697640 hasRelatedWork W4250695418 @default.
- W2032697640 hasVolume "109" @default.
- W2032697640 isParatext "false" @default.
- W2032697640 isRetracted "false" @default.
- W2032697640 magId "2032697640" @default.
- W2032697640 workType "article" @default.