What is the relationship between numbers of points,spectral width,acquisition time,and digital resolution?

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When would you use a homonuclear decoupling experiment?

 

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1. Sketch and label the three parts of the 1 PULSE FT-NMR experiment.

 

2. What is the result when you apply FT to an FID (time domain signal)?

 

3. What is the relationship between numbers of points, spectral width, acquisition time, and digital resolution? Which of these parameters would you change if you wanted better digital resolution, and why?

 

4. What is the peak shape found in most solution NMR spectra?

 

5. What shim(s) should be adjusted if the peak shape is asymmetrically distorted?

 

6. What is the single best factor to tell whether a sample is poorly shimmed?

 

7. What is the equation for determining signal-to-noise (S/N)?

 

8. Given that after 100 scans (5 min) the S/N for a sample is 35:1, how long will it take to achieve a S/N of 350:1?

 

9. What are the six factors that can affect the accuracy of a 1 H NMR spectral integration? Why? Are there any additional factors that affect the accuracy of a 13C-{1 H} integration? Why?

 

10. When would you use a homonuclear decoupling experiment?

 

11. Explain the difference between the 1 PULSE FT-NMR experiment used to acquire 13C-{1 H} NMR spectra and that used to acquire proton spectra?

 

 
 

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