Chapter 14: Nuclear Magnetic Resonance (NMR) Spectroscopy

What is NMR spectroscopy used for?

to detect nuclei that possess the magnetic property of spin

What does nuclear spin arise from?

the presence of protons and neutrons in the nucleus

Many nuclei with an odd mass number (such as ¹H, ¹³C, ³¹P) possess _____ and are therefore _____.

nuclear spin angular momentum,
NMR-active

¹H and ¹³C nuclei can have two allowed quantum spin states, which are…

+½ and -½

Nuclear spin causes the nuclei to behave like…

tiny magnets

How are nuclear magnetic spins oriented?

randomly

β-spin state ( -½ )

protons spin aligned against external magnetic field; higher in energy

α-spin state ( ½ )

protons spin aligned with external magnetic field; lower in energy