Calculation of the NMR second moment for materials with different types of internal rotation

Goc, Roman

doi:10.1016/s0926-2040(98)00082-4

Cited by 31 publications

(23 citation statements)

References 10 publications

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“…4 reveal a slow, nearly linear increase in T 1 throughout the range 10-50 MHz, a linear extrapolation of which is consistent with the value T 1 = 5.6 s at 346 MHz found here. The T 2 measurement directly probes the nuclear dipole-dipole interactions, and provides a value of the second moment, M 2 = (1/ γ T 2 ) 2 = 0.71 G 2 at room temperature, which can be used to compare different models of ammonium tetrahedral rotations [6]. The new T 1 data here indicate that a simple BPP theory with a single correlation time may not be appropriate for this material.…”

Section: Results and Analysismentioning

confidence: 94%

NMR Force Microscopy of Ammonium Sulfate with 12 μm Resolution

Manzanera

Markert

2012

MRS Proc.

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Position-dependent force-detected NMR measurements on a 25x15x7 μm 3 single crystal of ammonium sulfate (NH 4 ) 2 SO 4 were performed at room temperature in a sample-on-oscillator configuration. Force signals were detected with 12 μm resolution in a one-dimensional scan. Measurements of NMR relaxation times T 2 * = 1.5 ± 0.3 μs, T 2 = 44 ± 2 μs, and T 1 = 5.6 ± 0.7 s were obtained in an 8-T magnetic field, revealing an unexpected frequency-dependent fluctuation spectrum at room temperature.

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Section: Results and Analysismentioning

confidence: 94%

NMR Force Microscopy of Ammonium Sulfate with 12 μm Resolution

Manzanera

Markert

2012

MRS Proc.

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“…Any type of internal motion influences the local magnetic fields through the B ij term which depends on relative orientation of interacting spins with respect to the direction of the external magnetic field, as well as on the distance between the interacting spins. So, the formula for the second moment when internal motion occurs may be written in the form:21, 32 …”

Section: Resultsmentioning

confidence: 99%

Hybrid treatment of a symptomatic popliteal pseudoaneurysm due to type‐I endoleak after previous endovascular exclusion

Koning

Zeebregts

Reijnen

2008

Cathet Cardio Intervent

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“…The first problem has been solved by different methods [4,5,7] all of them being more or less approximate. A numerical solution to this problem for benzene and ammonium chloride was presented in [8,9] and a general case was described in [10]. The numerical calculations have an accuracy determined only by the accuracy of the structural data for the studied material, and have many advantages over the method applied previously.…”

Section: Second Moment Influence Of Motionmentioning

confidence: 99%

“…The basic formulae for our consideration will be those developed in [10]. In case of internal motion in a solid the nuclei take few different positions allowed by the symmetry of the studied material.…”

Section: Second Moment Dependence On the Temperaturementioning

confidence: 99%

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Simulation of the NMR Second Moment as a Function of Temperature in the Presence of Molecular Motion. Application to (CH₃)₃NBH₃

Goc

2002

Zeitschrift Für Naturforschung A

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The method for simulating the second moment of the NMR absorption spectrum as a function of temperature is presented. The second moment is first calculated as a function of the number of jumps of rotating molecules or their parts (like methyl groups). This number of jumps is rescaled into the frequency of internal rotation and these frequencies are recalculated into equivalent temperatures. The relation between frequency of rotation, and temperature is established on the basis of the Arrhenius relation c = 0 exp(;E a =RT ). The described method is then applied to the analysis of molecular motion in trimethylamine borane (CH 3 ) 3 NBH 3 . The proposed method is especially useful in the case of complex structures, where combined motions are possible, because the NMR second moment is much more sensitive to the geometry of motion than the magnetic relaxation times T 1 or T 1 usualy used in studies of the internal dynamics of solids.

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Calculation of the NMR second moment for materials with different types of internal rotation

Cited by 31 publications

References 10 publications

NMR Force Microscopy of Ammonium Sulfate with 12 μm Resolution

NMR Force Microscopy of Ammonium Sulfate with 12 μm Resolution

Hybrid treatment of a symptomatic popliteal pseudoaneurysm due to type‐I endoleak after previous endovascular exclusion

Simulation of the NMR Second Moment as a Function of Temperature in the Presence of Molecular Motion. Application to (CH₃)₃NBH₃

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Calculation of the NMR second moment for materials with different types of internal rotation

Cited by 31 publications

References 10 publications

NMR Force Microscopy of Ammonium Sulfate with 12 μm Resolution

NMR Force Microscopy of Ammonium Sulfate with 12 μm Resolution

Hybrid treatment of a symptomatic popliteal pseudoaneurysm due to type‐I endoleak after previous endovascular exclusion

Simulation of the NMR Second Moment as a Function of Temperature in the Presence of Molecular Motion. Application to (CH3)3NBH3

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Product

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Simulation of the NMR Second Moment as a Function of Temperature in the Presence of Molecular Motion. Application to (CH₃)₃NBH₃