181* NMR pulse, atomic description

In summary, a long-time user on the Physics Forums website asked for an explanation on how a 181* pulse is possible in NMR. While the commonly given explanation seems to only cover up to 180* pulses, other users provided more detailed explanations on the concept of bulk magnetization and how it relates to NMR pulses. The original poster thanked everyone for their insight and clarified that they were not trying to discredit the previous explanations, but rather seeking a more complete understanding.
  • #1
dilberto
1
0
Hi, long time user, first time poster.

A while back someone posted a great question
https://www.physicsforums.com/showthread.php?t=33584

To paraphrase, can you explain on a spin-by-spin level exactly how a 181* pulse is possible?

You always hear this really intuitive explanation of NMR pulses as a net imbalance of low energy state spins and as you excite them with RF energy, they go to high energy state. This causes the net imbalance to tip from 0*, to 180*. However, this explanation seems to only describe up to 180* pulses. The answers from 2004 trend towards bulk response and arm waving as soon as the questioner really presses on a 181* pulse.

So what's going on? Is the common explanation actually lacking in completeness. This seems like such a great little thought experiment. Thanks for any insight.
 
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  • #2
I don't think it was "arm waving" at all, considering the medium that one has to use to do such explanation (public forum). I thought the last 2 explanations by clint and Mike H was quite detailed. They tried to explain what is meant by the bulk magnetization, which is what we measure.

For a "long time user" (you officially joined yesterday), you had to dig up a very old thread to make your first post?

Zz.
 

Related to 181* NMR pulse, atomic description

1. What is 181* NMR pulse?

The 181* NMR pulse is a technique used in nuclear magnetic resonance (NMR) spectroscopy. It involves applying a specific radiofrequency pulse to a sample, which results in a spin flip of the nuclei in the sample. This technique is often used to study the atomic structure of molecules.

2. How does the 181* NMR pulse work?

The 181* NMR pulse works by applying a radiofrequency pulse at a specific frequency to a sample. This pulse causes the nuclei in the sample to flip their spin states, which can then be detected and analyzed. By studying the resulting signals, scientists can gain information about the atomic composition and structure of molecules.

3. What is the significance of the 181* in the name?

The 181* in the name refers to the frequency of the radiofrequency pulse used in the technique. The * symbol indicates that the pulse is applied at a specific angle, which is important for achieving the desired spin flip of the nuclei.

4. What is the atomic description in relation to 181* NMR pulse?

The atomic description in relation to 181* NMR pulse refers to the information that can be obtained about the atomic structure of molecules using this technique. By studying the signals produced by the spin flips of nuclei, scientists can gain insights into the chemical bonds, molecular geometry, and other atomic properties of molecules.

5. What are the applications of 181* NMR pulse?

The applications of 181* NMR pulse are wide-ranging and include drug discovery, materials science, and biochemistry. This technique is particularly useful for studying the atomic structure of complex molecules, such as proteins and polymers, and is often used in research and development for various industries.

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