Hi, I am interested in derivation of flip angle in nuclear magnetic resonance. We have magnetic dipole in static magnetic field. The magnetic dipole is precessing around the vector of this field with Larmore frequency. After applying square magnetic pulse with amplitude B1 oscillating on...
The first picture shows the "raw spectrum" before processing it and the second one is my attempt to process it.
I was not sure about the solvent peak because it is expected to be a singulett at 7,26 ppm but I could not really identify a clear singulett so I dichtet to go with the peak that stood...
hello, I'm form Germany and study biotechnology in my third semester and have to find an unknown substance by using an NMR spectrum. Unfortunately I have almost no experience in this field. Is here somebody who could help me analyze the spectrum? I would be very thankful
Hi
I was watching
Generally - you can activate use a strong magnetic field on ground, perturb it, and the pick the signal up with a satellite. The result would be in 60 to 1000 MHz ( VHF Television ) by a satellite.
But the post also says, that US army is using it to detect burried weapons...
Background Information (Not Strictly Necessary):
As a quick recap, the graph I am dealing with is a semi-logarithmic graph of free induction decay (FID) amplitude as a function of time. To acquire the value for ##{T_2}^*## (and its uncertainty) in the graph, I used the below equation to do so...
Background Information:
I am working on a pulsed NMR lab project that involves graphing out a semi-log graph of free induction decay amplitude as a function of time. After graphing out the semi-log graph, I am to determine the apparent spin-spin relaxation time (##{T_2}^*##) through the...
Hi,
Firstly, I apologize if this is the wrong forum to post this. I am learning about this concept in a biomedical engineering context, but perhaps this may be better suited to the Biology or Physics pages. If so, please let me know and I can move the post.
In short, I am confused how we can...
Please refer to the homework statement.
Or, if one would like to put it in other words, how would I go about finding ##T_2## if I know the delay time between 90-degree and 180-degree pulses? Is there an equation that helps solve this succinctly?
The peaks all look unfamiliar, no symmetry, or very little, and they all integrate to a small number of hydrogen while being surrounded by a large number.
Here are the images.1.)
2.)
3.)
4.)
5.)
Thanks for any explanations. I don't expect anyone to do it for me, I just have no other...
For simplicity I only take a system of two interacting spin-##1/2## nuclei. If the spins have quantum numbers ##m_1## and ##m_2## respectively when in a certain state, then the energy of that particular state is$$E_{m_1m_2} = m_1 v_{0,1} + m_2 v_{0,2} + m_1 m_2 J_{12}$$where ##v_{0,1}## and...
I was doing a question that wanted you to determine the structure given a molecular formula and an NMR spectrum. The following was the answer:
I'm unsure as to how the multiplicities were obtained. For ##X##, the neighbouring carbon ##Y## has 2 hydrogens, so this peak is a triplet (OK so far!)...
Hello there,
Spin–spin coupling is encountered in the majority of NMR spectra. However, it does only occur when the two interacting nuclei are non-"identical". But why is the coupling not occurring between "identical" nuclei?
I have been wondering about this because I could not think of a...
Hi all, I'm fairly new here.
I'm currently designing an as-homogene-as-possible permanent magnet for low-field NMR and similar experiments. I'm on a fairly tight budget, and having finally found pole pieces for my magnets, I got them even though they have a small saw cut in the edge. approx. 5...
Hello,
I am a civil engineer and have been working on concrete creep phenomenon for several years now. After reviewing a large amount of literature on related topics throughout this time, some interesting observations have emerged, and they have formed the idea that the material creep mechanism...
Hi all,
I have nuclear magnetic resonance spectrum. The vertical axis is intensity, and the horizontal axis is index. I need to find integral under the peak. But I am not sure, what region should I choose for integration - region 1 or region 2? Please find attached the spectrum.
*** Answered off site. No need for further explanation. ***
I am trying to understand MR Imaging physics.
In NMR, when you put some energy in a system with a static longitudinal net magnetization, you create a transverse component and the longitudinal component decreases (in other words, net...
Could I have hundred times the ground state or there is a limit?
Is there a limit for excited magnetic momentum that if reached the nucleous explode or generate gammas?
I suppose If I excite it it would spin faster but proportional to quantum values. Note: there is a "theory" to avoid electron...
NMR textbooks often state that an ensemble of nuclei cannot absorb the excitation radiowaves if the spin population is "saturated" (wherein "saturated" is often described as equal spin population in all energy states, or a population inversion). But these same NMR textbooks show that a 180...
Homework Statement
We want to image carbon C14 atoms using NMR with magnetic field of B=3 T. What frequency do we need to use? Use the following facts: C14 has 0% abundance, nuclear spin of I=3 and g=0.273
Homework Equations
The frequency is given by f= (2⋅I) ⋅ (g ⋅B ⋅μ)/(1836 ⋅h), where μ...
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