Order Magnetic Resonance Spectra Essay

Order Magnetic Resonance Spectra Essay

Magnetic Resonance Spectra

A 500-MHz proton NMR signal is at 3,200 Hz relative to TMS

(tetramethylsilane). What is the chemical shift?

Calculate the value of the nuclear magneton (Uy).

Calculate the magnetogyric (¥) ratio for hydrogen.

The magnetogyric ratio (y) for hydrogen is 2.675 x 108 T”! s-!, What

magnetic field strength (B) is necessary for hydrogen in a sample to

absorb radiation at a frequency (Vv) of 250 MHz?

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The magnetogyric ratio (y) for hydrogen is 2.675 x 10° T~! s”!. What is

the Larmor frequency (v,) of a hydrogen atom in a magnetic field (B) of ©

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The magnetogyric ratio (y) for fluorine is 2.518 x 10° T7! s!. If the

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Order Magnetic Resonance Spectra Essay

magnetic field strength (B) in the NMR is 6.0 T, at what frequency (Vv), ©

in megahertz, will the fluorine absorb the radiation?

The magnetic transition frequency (V) for a hydrogen atom in an NMR !

spectrometer is 250 MHz (2.5 x 10% s“!). What is the corresponding

energy (£) in kilojoules per mole?

In proton NMR, the hydrogen nuclei can be in one of two states.

Calculate the ratio of hydrogen nuclei in the lower state (/V,) to the

hydrogen nuclei in the higher state (V,). Assume that the field strength

(B) is 5.9 T at 298 i (7).

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58 » McGraw-Hill’s 500 Physical Chemistry Questions

338. In proton NMR, the hydrogen nuclei can be in one of two states.

Calculate the ratio of hydrogen nuclei in the lower state (/V;) to the

hydrogen nuclei in the higher state (V,). Assume that this is a very-lowtemperature experiment where the field strength (B) is 5.9 T at 1.0 K (7).

339. The nuclear spin (/) of boron-11 is 3/2. What are the energies (£) of the

nuclear spin states for a boron-11 atom ina field of 6.5 T (B)?

340. The nuclear g factor (gy) for boron-11 is 1.792 and its nuclear spin (/) is

3/2. At what frequency (VxyyjR) will the boron signal appear in an NMR

instrument with a magnet rated at 5.5 T (B)?

341. The g value for a radical trapped in a matrix is 2.0088 when the field is

aligned along the principal molecular symmetry axis. What magnetic field

strength (B) is necessary to observe an ESR (Electron Spin Resonance)

signal using a frequency (Vesp) of 9.42 GHz (9.42 x 10? s“!) from a

microwave generator?

342. What magnetic field strength (B) is necessary for an electron in a sample to

absorb radiation at a frequency (Vv) of 1.0 x 104 MHz?

343. What is the Larmor frequency (v,) of an electron in a magnetic field (B) of

50 T?

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