NMR Experiments: Why Do I Need a Broadband Probe Head?

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Discussion Overview

The discussion revolves around the necessity of a broadband probe head for an NMR (Nuclear Magnetic Resonance) experiment. Participants explore the implications of using a broadband receiver versus one tuned to a specific Larmor frequency, considering factors such as resonance frequency and signal detection.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant inquires about the need for a broadband probe head, mentioning a specific resonance frequency of 50 MHz and a 2 Tesla magnet.
  • Another participant suggests that a broadband receiver may not be necessary if the receiver is tuned to the Larmor frequency, questioning whether the probe is intended for multiple nuclei or varying field strengths.
  • A participant expresses confusion regarding their professor's insistence on using a broadband probe head, seeking clarification on the reasons for requiring a broadband signal and whether the linewidth remains consistent with this method.
  • There is a reiteration of the need for clarification from the professor, emphasizing the participant's reluctance to ask again due to a lack of understanding.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of a broadband probe head, with some suggesting it may not be required while others question the implications of using a standard receiver. The discussion remains unresolved regarding the specific requirements for the NMR experiment.

Contextual Notes

Participants mention factors such as resonance frequency, impedance matching (50 ohms), and the potential for using the probe with multiple nuclei or field strengths, but do not resolve the implications of these factors.

annaline19
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Hello
I have to do an nmr experiement. Why do i need a broadband probe head? I have a magnet with 2 tesla. and modulation coils on it with a frequency of 50hz. For example i have a resonance frequency at 50mhz.
i hope you can pelp me.
 
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You shouldn't need a broadband receiver, just a receiver near the Larmor frequency. Are you using the probe for multiple nuclei or field strengths?
 
the idea is at resonance frequency the resistor is 50ohm. if something is into the probe head 50ohm it differs. and an nmr detector detects this and shows a signal.
the problem is my prof says i need it and i don't want to ask him again because i didnt understand it.
what can the reason be for a broadband signal? is the linewith always the same with this method?
 
annaline19 said:
my prof says i need it and i don't want to ask him again because i didnt understand it.
Um, that is part of your professor's job.

Again, are you using the same receiver for multiple nuclei or field strengths?
 
Last edited:

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