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13 Dec 2019

If radio waves of 1.5 MHz are absorbed by unknown atoms in a gas, what is the energy difference (in eV) between the spin-up and spin-down states?

If this is the energy required to flip the spin in an applied magnetic field of 0.035T, what is the magnetic moment?

What atoms are in the gas? (enter periodic table symbol)

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Hubert KochLv2

17 Dec 2019

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Part 1. Altered Reality: Suppose the electron were not a âfermionâ and instead was completely different particle that we will call the âtri-onâ. This tri-on has 3 spin states instead of two â we will call these spin up, spin down, and no-spin. Now imagine in this new world all the other physical principles still seem to hold â that is electronic energy levels and orbitals are still quantized, the angular momentum and magnetic quantum number have the same rules, and the Pauli principle is still valid. Also assume there are still atoms and molecules.
-What would the electron configuration of copper be? Use the shorthand notation corresponding to this altered universe. Is copper a transition metal in this periodic table?

NMR (nuclear magnetic resonance) Uses the same theory and technology as an MRI!

1-What is the source of energy in NMR?____________________________________ What happens to atoms in a molecule exposed to this energy?_______________________________

2-What are two atom types that can be observed by NMR?________________________

3-What units are used to measure the strength of the magnetic field used?____________________ More significantly for us, what units are used to indicate the frequency of radiation used for resonance?________________

(Our instrument downstairs (a picoSpin) is 45 MHz. At the MN NMR Center at the U, they have instruments ranging 500 â 900 MHz.)

4-What can be distinguished with NMR?______________________________________________________

5-What are the axes of an NMR spectrum?____________________________________________________

6-What are the four different features of a spectrum that can provide information?

7-The number of NMR signals in a spectrum is equal to what?___________________________________

8-The position of an NMR signal in a spectrum depends on the electronic environment surrounding a particular __________________________.

9-If a proton is attached to an electronegative atom, it absorbs (downfield or upfield).

10-Where in an NMR spectrum would we expect to see an aldehyde H? See Table 14.1 ________________

11-What information is given by the area under an NMR signal?____________________________________

12-What information about is given by spin-spin splitting?________________________________________

13-How many peaks are contained in an NMR signal that has been described as a triplet?_________________________ How many adjacent protons are splitting this signal?________________

Skipping to section 14.11â¦

14-What do the number of different signals in a ¹³C spectrum indicate? __________________________________

15-What is the range of chemical shifts in a ¹³C spectrum?______________________________________________

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