{"title":"Cumulative Author Index for 1996","authors":"","doi":"10.1006/jmra.1996.0249","DOIUrl":"https://doi.org/10.1006/jmra.1996.0249","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 258-262"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0249","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136421162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Author Index for Volume 123","authors":"","doi":"10.1006/jmra.1996.0248","DOIUrl":"https://doi.org/10.1006/jmra.1996.0248","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Page 257"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0248","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136421163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Enhancement of 2D INADEQUATE Spectra by Means of Singular-Value Decomposition","authors":"Jörg Lambert","doi":"10.1006/jmra.1996.0238","DOIUrl":"10.1006/jmra.1996.0238","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 211-214"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0238","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80905474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Heteronuclear-Detected Diffusion-Ordered NMR Spectroscopy through Coherence Transfer","authors":"Donghui Wu, Aidi Chen, Charles S. Johnson, Jr.","doi":"10.1006/jmra.1996.0239","DOIUrl":"10.1006/jmra.1996.0239","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 215-218"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0239","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76859577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The phenomenon of multiple echoes following a two-pulse stimulated-echo experiment in highly polarized systems is reinvestigated and explained using the Bloch equations. A semiquantitative formalism based on the nuclear contributions to the magnetic susceptibility throughout a multiple-pulse sequence is outlined and used to understand the formation of the echoes. This theory is used to direct the design of phase-cycled and pulsed-field-gradient experiments to control the echo formation. The theory also suggests a means of indirectly detecting a heteronucleus contained in a different molecule. This kind of detection is accomplished by modifying the static magnetic field with a stimulated-echo experiment on one set of the spins. Heteronuclear experiments show that this classical semiquantitative formalism is a useful tool in the understanding of spin dynamics in highly polarized systems.
{"title":"Observation of Bulk Susceptibility Effects in High-Resolution Nuclear Magnetic Resonance","authors":"Matthew P. Augustine , Kurt W. Zilm","doi":"10.1006/jmra.1996.0228","DOIUrl":"10.1006/jmra.1996.0228","url":null,"abstract":"<div><p>The phenomenon of multiple echoes following a two-pulse stimulated-echo experiment in highly polarized systems is reinvestigated and explained using the Bloch equations. A semiquantitative formalism based on the nuclear contributions to the magnetic susceptibility throughout a multiple-pulse sequence is outlined and used to understand the formation of the echoes. This theory is used to direct the design of phase-cycled and pulsed-field-gradient experiments to control the echo formation. The theory also suggests a means of indirectly detecting a heteronucleus contained in a different molecule. This kind of detection is accomplished by modifying the static magnetic field with a stimulated-echo experiment on one set of the spins. Heteronuclear experiments show that this classical semiquantitative formalism is a useful tool in the understanding of spin dynamics in highly polarized systems.</p></div>","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 145-156"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0228","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76612176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The time resolution of flash-CIDNP experiments (time-resolved measurements of photochemically induced dynamic nuclear polarizations) can be increased by using NMR observation pulses that are delayed from scan to scan by an interval shorter than the pulse duration, and which need not be short on the time scale of the chemical kinetics. Recording a kinetic curve with such pulses amounts to passing it through a low pass filter. The dependence of the transfer function of the latter on duration and shape of theB1pulse, as well as the influence of the flip angle are analyzed. It is shown that, in order to achieve maximum sensitivity, flip angle and acquisition time must be optimized in a way different from that used in conventional NMR experiments. With regard to hardware-dependent parameters, the time resolution of the method is basically limited by the rise time of theB1pulses; in contrast, in the regime where the transfer function is determined by the pulse width, there is a trade-off between sensitivity and time resolution, and the strength of theB1field is the most important factor.
{"title":"Optimization of Flash-CIDNP Experiments","authors":"Martin Goez","doi":"10.1006/jmra.1996.0230","DOIUrl":"10.1006/jmra.1996.0230","url":null,"abstract":"<div><p>The time resolution of flash-CIDNP experiments (time-resolved measurements of photochemically induced dynamic nuclear polarizations) can be increased by using NMR observation pulses that are delayed from scan to scan by an interval shorter than the pulse duration, and which need not be short on the time scale of the chemical kinetics. Recording a kinetic curve with such pulses amounts to passing it through a low pass filter. The dependence of the transfer function of the latter on duration and shape of the<em>B</em><sub>1</sub>pulse, as well as the influence of the flip angle are analyzed. It is shown that, in order to achieve maximum sensitivity, flip angle and acquisition time must be optimized in a way different from that used in conventional NMR experiments. With regard to hardware-dependent parameters, the time resolution of the method is basically limited by the rise time of the<em>B</em><sub>1</sub>pulses; in contrast, in the regime where the transfer function is determined by the pulse width, there is a trade-off between sensitivity and time resolution, and the strength of the<em>B</em><sub>1</sub>field is the most important factor.</p></div>","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 161-167"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0230","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76147426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Analytical coherence- and polarization-transfer functions are presented for spin systems consisting of three spins- with arbitrary coupling constants under isotropic-mixing conditions. Based on these transfer functions, optimal durations for the mixing-time period can be determined for correlations of interest. The analytical expressions also make it possible to prove that isotropic-mixing polarization-transfer functions cannot become negative for three coupled spins-.
{"title":"Analytical Coherence-Transfer Functions for the General AMX Spin System under Isotropic Mixing","authors":"Oliver Schedletzky, Steffen J. Glaser","doi":"10.1006/jmra.1996.0232","DOIUrl":"10.1006/jmra.1996.0232","url":null,"abstract":"<div><p>Analytical coherence- and polarization-transfer functions are presented for spin systems consisting of three spins-<span><math><mtext>1</mtext><mtext>2</mtext></math></span> with arbitrary coupling constants under isotropic-mixing conditions. Based on these transfer functions, optimal durations for the mixing-time period can be determined for correlations of interest. The analytical expressions also make it possible to prove that isotropic-mixing polarization-transfer functions cannot become negative for three coupled spins-<span><math><mtext>1</mtext><mtext>2</mtext></math></span>.</p></div>","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 174-180"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0232","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77600726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Natural-Abundance Solid-State33S NMR with High-Speed Magic-Angle Spinning","authors":"William A. Daunch, Peter L. Rinaldi","doi":"10.1006/jmra.1996.0240","DOIUrl":"10.1006/jmra.1996.0240","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 219-221"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0240","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87407446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Rigorous Statistical Analysis of Errors in Chemical-Shift-Tensor Components Obtained from Spinning Sidebands in Solid-State NMR","authors":"Alejandro C. Olivieri","doi":"10.1006/jmra.1996.0237","DOIUrl":"10.1006/jmra.1996.0237","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 207-210"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0237","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89368120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cumulative Subject Index for 1996","authors":"","doi":"10.1006/jmra.1996.0250","DOIUrl":"https://doi.org/10.1006/jmra.1996.0250","url":null,"abstract":"","PeriodicalId":16165,"journal":{"name":"Journal of Magnetic Resonance, Series A","volume":"123 2","pages":"Pages 263-298"},"PeriodicalIF":0.0,"publicationDate":"1996-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmra.1996.0250","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136421161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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