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Ihara Y, Hayashi K, Kanda T, Matsui K, Kindo K, Kohama Y. Nuclear magnetic resonance measurements in dynamically controlled field pulse. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:114709. [PMID: 34852526 DOI: 10.1063/5.0067821] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 10/27/2021] [Indexed: 06/13/2023]
Abstract
We present the architecture of the versatile nuclear magnetic resonance (NMR) spectrometer with software-defined radio technology and its application to the dynamically controlled pulsed magnetic fields. The pulse-field technology is the only solution to access magnetic fields greater than 50 T, but the NMR experiment in the pulsed magnetic field was difficult because of the continuously changing field strength. The dynamically controlled field pulse allows us to perform NMR experiment in a quasi-steady field condition by creating a constant magnetic field for a short time around the peak of the field pulse. We confirmed the reproducibility of the field pulses using the NMR spectroscopy as a high precision magnetometer. With the highly reproducible field strength, we succeeded in measuring the nuclear spin-lattice relaxation rate 1/T1, which had never been measured by the pulse-field NMR experiment without dynamic field control. We also implement the NMR spectrum measurement with both the frequency-sweep and field-sweep modes and discuss the appropriate choices of these modes depending on the magnetic properties of the sample to be measured. This development, with further improvement at a long-duration field pulse, will innovate the microscopic measurement in extremely high magnetic fields.
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Affiliation(s)
- Y Ihara
- Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - K Hayashi
- Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - T Kanda
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - K Matsui
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - K Kindo
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Y Kohama
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Meier B, Kohlrautz J, Haase J, Braun M, Wolff-Fabris F, Kampert E, Herrmannsdörfer T, Wosnitza J. Nuclear magnetic resonance apparatus for pulsed high magnetic fields. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:083113. [PMID: 22938280 DOI: 10.1063/1.4746988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A nuclear magnetic resonance apparatus for experiments in pulsed high magnetic fields is described. The magnetic field pulses created together with various magnet coils determine the requirements such an apparatus has to fulfill to be operated successfully in pulsed fields. Independent of the chosen coil it is desirable to operate the entire experiment at the highest possible bandwidth such that a correspondingly large temporal fraction of the magnetic field pulse can be used to probe a given sample. Our apparatus offers a bandwidth of up to 20 MHz and has been tested successfully at the Hochfeld-Magnetlabor Dresden, even in a very fast dual coil magnet that has produced a peak field of 94.2 T. Using a medium-sized single coil with a significantly slower dependence, it is possible to perform advanced multi-pulse nuclear magnetic resonance experiments. As an example we discuss a Carr-Purcell spin echo sequence at a field of 62 T.
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Affiliation(s)
- Benno Meier
- University of Leipzig, Faculty of Physics and Earth Science, Linnéstrasse 5, 04103 Leipzig, Germany.
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Katz I, Shtirberg L, Shakour G, Blank A. Earth field NMR with chemical shift spectral resolution: theory and proof of concept. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2012; 219:13-24. [PMID: 22595293 DOI: 10.1016/j.jmr.2012.04.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 03/22/2012] [Accepted: 04/06/2012] [Indexed: 05/31/2023]
Abstract
A new method for obtaining an NMR signal in the Earth's magnetic field (EF) is presented. The method makes use of a simple pulse sequence with only DC fields which is much less demanding than previous approaches in terms of the pulses' rise and fall times. Furthermore, it offers the possibility of obtaining NMR data with enough spectral resolution to allow retrieving high resolution molecular chemical shift (CS) information - a capability that was not considered possible in EF NMR until now. Details of the pulse sequence, the experimental system, and our specially tailored EF NMR probe are provided. The experimental results demonstrate the capability to differentiate between three types of samples made of common fluorine compounds, based on their CS data.
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Affiliation(s)
- Itai Katz
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 32000, Israel
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Li M, Schiano JL, Samra JE, Shetty KK, Brey WW. Reduction of magnetic field fluctuations in powered magnets for NMR using inductive measurements and sampled-data feedback control. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2011; 212:254-64. [PMID: 21885308 DOI: 10.1016/j.jmr.2011.05.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Revised: 05/10/2011] [Accepted: 05/13/2011] [Indexed: 05/06/2023]
Abstract
Resistive and hybrid (resistive/superconducting) magnets provide substantially higher magnetic fields than those available in low-temperature superconducting magnets, but their relatively low spatial homogeneity and temporal field fluctuations are unacceptable for high resolution NMR. While several techniques for reducing temporal fluctuations have demonstrated varying degrees of success, this paper restricts attention to methods that utilize inductive measurements and feedback control to actively cancel the temporal fluctuations. In comparison to earlier studies using analog proportional control, this paper shows that shaping the controller frequency response results in significantly higher reductions in temporal fluctuations. Measurements of temporal fluctuation spectra and the frequency response of the instrumentation that cancels the temporal fluctuations guide the controller design. In particular, we describe a sampled-data phase-lead-lag controller that utilizes the internal model principle to selectively attenuate magnetic field fluctuations caused by the power supply ripple. We present a quantitative comparison of the attenuation in temporal fluctuations afforded by the new design and a proportional control design. Metrics for comparison include measurements of the temporal fluctuations using Faraday induction and observations of the effect that the fluctuations have on nuclear resonance measurements.
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Affiliation(s)
- Mingzhou Li
- Pennsylvania State University, Department of Electrical Engineering, University Park, PA 16802, USA
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Abou-Hamad E, Bontemps P, Rikken GLJA. NMR in pulsed magnetic field. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2011; 40:42-44. [PMID: 21798722 DOI: 10.1016/j.ssnmr.2011.06.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2011] [Accepted: 06/25/2011] [Indexed: 05/31/2023]
Abstract
Nuclear magnetic resonance (NMR) experiments in pulsed magnetic fields up to 30.4 T focused on (1)H and (93)Nb nuclei are reported. Here we discuss the advantage and limitation of pulsed field NMR and why this technique is able to become a promising research tool.
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Paasch S, Brunner E. Trends in solid-state NMR spectroscopy and their relevance for bioanalytics. Anal Bioanal Chem 2010; 398:2351-62. [DOI: 10.1007/s00216-010-4037-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Revised: 06/14/2010] [Accepted: 07/14/2010] [Indexed: 01/25/2023]
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Hung I, Shetty K, Ellis PD, Brey WW, Gan Z. High-field QCPMG NMR of large quadrupolar patterns using resistive magnets. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2009; 36:159-63. [PMID: 19913391 DOI: 10.1016/j.ssnmr.2009.10.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2009] [Revised: 10/09/2009] [Accepted: 10/21/2009] [Indexed: 05/06/2023]
Abstract
Spectroscopy in a high magnetic field reduces second-order quadrupolar shift while increasing chemical shift. It changes the scale between quadrupolar and chemical shift of half-integer quadrupolar spins. The application of QCPMG multiple echo for acquiring large quadrupolar pattern under the high magnetic field of a 25 T resistive magnet is presented for acquiring large quadrupolar patterns. It shows that temporal field fluctuations and spatial homogeneity of the Keck magnet at the NHMFL contribute about +/- 20 ppm in line broadening. NMR patterns which have breadths of hundreds to thousands of kilohertz can be efficiently recorded using a combination of QCPMG and magnetic field stepping with negligible hindrance from the inhomogeneity and field fluctuations of powered magnets.
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Affiliation(s)
- Ivan Hung
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA
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Kirkby C, Stanescu T, Fallone BG. Magnetic field effects on the energy deposition spectra of MV photon radiation. Phys Med Biol 2008; 54:243-57. [DOI: 10.1088/0031-9155/54/2/005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gan Z, Kwak HT, Bird M, Cross T, Gor'kov P, Brey W, Shetty K. High-field NMR using resistive and hybrid magnets. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2008; 191:135-140. [PMID: 18226940 DOI: 10.1016/j.jmr.2007.12.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Revised: 12/03/2007] [Accepted: 12/20/2007] [Indexed: 05/25/2023]
Abstract
Resistive and resistive-superconducting hybrid magnets can generate dc magnetic fields much higher than conventional superconducting NMR magnets but the field spatial homogeneity and temporal stability are usually not sufficient for high-resolution NMR experiments. Hardware and technique development addressing these issues are presented for high-resolution NMR at magnetic fields up to 40T. Passive ferromagnetic shimming and magic-angle spinning are used effectively to reduce the broadening from inhomogeneous magnetic field. A phase correction technique based on simultaneous heteronuclear detection is developed to compensate magnetic field fluctuations to achieve high spectral resolution.
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Affiliation(s)
- Zhehong Gan
- Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA.
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Shapira B, Shetty K, Brey WW, Gan Z, Frydman L. Single Scan 2D NMR Spectroscopy on a 25 T Bitter Magnet. Chem Phys Lett 2007; 442:478-482. [PMID: 18037970 PMCID: PMC2084366 DOI: 10.1016/j.cplett.2007.06.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
2D NMR relies on monitoring systematic changes in the phases incurred by spin coherences as a function of an encoding time t(1), whose value changes over the course of independent experiments. The intrinsic multiscan nature of such protocols implies that resistive and/or hybrid magnets, capable of delivering the highest magnetic field strengths but possessing poor temporal stabilities, become unsuitable for 2D NMR acquisitions. It is here shown with a series of homo- and hetero-nuclear examples that such limitations can be bypassed using recently proposed 2D "ultrafast" acquisition schemes, which correlate interactions along all spectral dimensions within a single scan.
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Affiliation(s)
- Boaz Shapira
- Department of Chemical Physics, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Kiran Shetty
- National High Magnetic Field Laboratory, 1800 East, Paul Dirac Drive, Tallahassee, FL 32310, USA
| | - William W. Brey
- National High Magnetic Field Laboratory, 1800 East, Paul Dirac Drive, Tallahassee, FL 32310, USA
| | - Zhehong Gan
- National High Magnetic Field Laboratory, 1800 East, Paul Dirac Drive, Tallahassee, FL 32310, USA
| | - Lucio Frydman
- Department of Chemical Physics, Weizmann Institute of Science, 76100 Rehovot, Israel
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Iijima T, Takegoshi K, Hashi K, Fujito T, Shimizu T. High-resolution NMR with resistive and hybrid magnets: deconvolution using a field-fluctuation signal. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2007; 184:258-62. [PMID: 17123849 DOI: 10.1016/j.jmr.2006.10.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2006] [Revised: 10/20/2006] [Accepted: 10/23/2006] [Indexed: 05/12/2023]
Abstract
A method for compensating effect of field fluctuation is examined to attain high-resolution NMR spectra with resistive and hybrid magnets. In this method, time dependence of electromotive force induced for a pickup coil attached near a sample is measured synchronously with acquisition of NMR. Observed voltage across the pickup coil is converted to field fluctuation data, which is used to deconvolute NMR signals. The feasibility of the method is studied by (79)Br MAS NMR of KBr under a 30T magnetic field of a hybrid magnet. Twenty single-scan NMR signals were accumulated after the manipulation, resulting in a high-resolution NMR spectrum.
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Affiliation(s)
- Takahiro Iijima
- Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan.
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