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Abstract

Additional experimental evidence of rotary resonance effects for multiple-quantum coherence conversion in a spin-5/2 system is presented. Two dimensional plots of the relative efficiency of MQ excitation and conversion are given as a function of radio frequency (rf) amplitude & pulse width. Data are presented for the excitation of five-quantum coherence (5QC), as well as for 5QC to three-quantum coherence (3QC) conversion, 5QC lớn 1QC (the central transition coherence) conversion, and 3QC khổng lồ 1QC conversion. A two-fold increase in the signal-to-noise ratio is achieved by substituting low amplitude rf pulses in place of hard rf pulses for 5QC excitation and 5QC to lớn 3QC conversion in a mixed multiple-quantum MAS (MMQMAS) experiment. The anisotropic line shape for the low amplitude rf pulse version of the MMQMAS experiment was observed to be distorted from the MAS line shape. The cause và implications of the distortion are discussed.


Authors: Logan, John W; Urban, Jeffry T; Walls, Jamie D; Lyên, KwangHun; Jerschow, Alexej; Pines, Alexander Publication Date: Mon Atruyền thông quảng cáo 15 00:00:00 EDT 2002 Research Org.: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States) Sponsoring Org.: USDOE Director, Office of Science. Office of Basic EnergySciences. Materials Science and Engineering Division 6struyenky.vn Identifier: 861010 Report Number(s): LBNL-51091Journal ID: ISSN 0926-2040; R&D Project: 508601; BnR: KC0203010; TRN: US200601%%576 DOE Contract Number: DE-AC02-05CH11231 Resource Type: Journal Article Journal Name: Solid State Nuclear Magnetic Resonance Additional Journal Information: Journal Volume: 22; Journal Issue: 2-3; Related Information: Journal Publication Date: Sept./Nov.2002; Journal ID: ISSN 0926-2040 Country of Publication: United States Language: English Subject: 36 MATERIALS SCIENCE; AMPLITUDES; EFFICIENCY; EXCITATION; NUCLEI; RESONANCE; SHAPE; SIGNAL-TO-NOISE RATIO
Logan, John W, Urban, Jeffry T, Walls, Jamie D, Lyên, KwangHun, Jerschow, Alexej, and Pines, Alexander. Investigations of low amplitude radio frequency pulses at & awayfro m rotary resonance conditions for I = 5/2 nuclei. United States: N. p., 2002. Web. doi:10.1006/snmr.2002.0084.


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Logan, John W, Urban, Jeffry T, Walls, Jamie D, Lim, KwangHun, Jerschow, Alexej, & Pines, Alexander. Investigations of low amplitude radio frequency pulses at & awayfro m rotary resonance conditions for I = 5/2 nuclei. United States. https://doi.org/10.1006/snmr.2002.0084
Logan, John W, Urban, Jeffry T, Walls, Jamie D, Lyên ổn, KwangHun, Jerschow, Alexej, and Pines, Alexander. Mon . "Investigations of low amplitude radio frequency pulses at & awayfro m rotary resonance conditions for I = 5/2 nuclei". United States. https://doi.org/10.1006/snmr.2002.0084. https://www.6struyenky.vn/servlets/purl/861010.


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article6struyenky.vn_861010, title = Investigations of low amplitude radio frequency pulses at và awayfro m rotary resonance conditions for I = 5/2 nuclei, author = Logan, John W và Urban, Jeffry T and Walls, Jamie D và Llặng, KwangHun & Jerschow, Alexej and Pines, Alexander, abstractchú ý = Additional experimental evidence of rotary resonance effects for multiple-quantum coherence conversion in a spin-5/2 system is presented. Two dimensional plots of the relative efficiency of MQ excitation & conversion are given as a function of radio frequency (rf) amplitude and pulse width. Data are presented for the excitation of five-quantum coherence (5QC), as well as for 5QC to lớn three-quantum coherence (3QC) conversion, 5QC to lớn 1QC (the central transition coherence) conversion, & 3QC to lớn 1QC conversion. A two-fold increase in the signal-to-noise ratio is achieved by substituting low amplitude rf pulses in place of hard rf pulses for 5QC excitation và 5QC to 3QC conversion in a mixed multiple-quantum MAS (MMQMAS) experiment. The anisotropic line shape for the low amplitude rf pulse version of the MMQMAS experiment was observed lớn be distorted from the MAS line shape. The cause and implications of the distortion are discussed., doi = 10.1006/snmr.2002.0084, url = https://www.6struyenky.vn/biblio/861010, journal = Solid State Nuclear Magnetic Resonance, issn = 0926-2040, number = 2-3, volume = 22, place = United States, year = Mon Atruyền thông quảng cáo 15 00:00:00 EDT 2002, month = Mon Aquảng cáo 15 00:00:00 EDT 2002

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