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UMCP, NMR Center Yiu-fai Lam, Oct 2013

Basic NMR Orientation. H ow to get help: Contact Us ! Yiu-Fai Lam; Yinde Wang; H ow to look NMR Basic information and Training notes. W hat is in a Basic Level Check Out? H ow to reserve NMR time? www.chem.umd.edu/nmr H ow to keep all of us SAFE ! H ow not to break NMR tubes!.

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UMCP, NMR Center Yiu-fai Lam, Oct 2013

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  1. Basic NMR Orientation How to get help: Contact Us ! Yiu-Fai Lam; Yinde Wang; How to look NMR Basic information and Training notes. What is in a Basic Level Check Out? How to reserve NMR time? www.chem.umd.edu/nmr How to keep all of us SAFE ! How not to break NMR tubes! UMCP, NMR Center Yiu-fai Lam, Oct 2013 Safety- Orientation

  2. Potential Risk and Danger of All Super-conducting magnets!

  3. Strong Magnet Field: Even for a Shielded magnet

  4. Outer cylinder Liquid Nitrogen Inner tank Liquid Helium 3K Cross-section – super conducting magnet Insulation layers at high vacuum Magnet Wire NMR sample Center of strongest magnetic field

  5. When tanks touch (short) --- insulation is then broken----Cryogen boils off all at the same time --- High pressure builds up ! Super-Conducting Magnet Liquid Nitrogen Liquid Helium Sample

  6. How to (not to) break a NMR tube?Recommended way to install NMR sample into a rotor • Select the blue plastic spinner (rotor) from the bench Hold the NMR tube steady and gently rotate the spinner & push it upward along the NMR tube ! 2. Place the rotor on the depth gauge. 3. Push gently the tube till it touches the bottom of the gauge Fragile!

  7. How to load NMR sample into the magnet ! Either use the pull down menu or press the Lift Button on the keypad, It will release a strong compressed air at the top opening of the magnet. Extreme care when step up and/or down (backward only) to change your sample !

  8. Proper way to insert NMR sample! • Take the standby dummy sample & spinner out (for basic NMR 400 only) . • Carefully place your sample & spinner into the opening. Before releasing the NMR tube&spinner, ensure there is enough air pressure at the insertion port of the magnet ! 3. Click Sample down or press the Lift button again !

  9. NMR sample and spinner A free fall without air support will break a NMR sample ! ~ 3 feet Magnet Shim stacks Probe cross-cut enlarged

  10. Shim Stacks NMR Probe (shown without cover) Radio Frequency Coils Inner coil: Observed nucleus highest sensitivity Outer coil-decouple and Lock

  11. Summary: Safety in NMR Laboratory: • Magnetic field is permanent; exists even when electric power is out. • Pined or caught between the magnet and any external metal object could be FATAL! • Keep all metal objects at least 10 ft away from magnet. • Keep all Credit cards, watches, keys, cell phones also away from the magnet. • Admit students taking this course only.

  12. Conclusion of NMR orientation • Sign your liability weaver in the User registration Log! • Criteria for basic NMR check out: • Proper Shimming (Manually). • Obtain a routine H-1 1D spectrum within ten minutes. • Basic processing (proper use of layouts; list parameters, shifts and integration). • Transfer raw data to NMR workstation. • Dead-line for check out: • Four weeks from date of orientation. • Late penalty: $100 per user. • Contact me via E-mail; YFLAM@UMD.EDU

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