MS and NMR

Question 1

Mass spectrometer

Answer 1

ionize sample with an ion source, ions separated by m/z ratio, ion current recorded, spectrum is plot of ion current versus m/z

Question 2

Isotopomers

Answer 2

Have the same chemical composition but different isotope compositions; give distinctive isotope patterns

Question 3

Fragmentations

Answer 3

hard ionization technique (gaseous sample —> e- beam —> molecular ion (M+)

Question 4

Nuclei to study

Answer 4

nuclei with a nuclear magnetic moment, non zero spin quantum number

Question 5

Chemical equivalence

Answer 5

nuclei have the same chemical environment; are symmetrically equivalent

Question 6

Magnetic equivalence

Answer 6

nuclei have the same chemical environment PLUS they couple equally to each other magnetic nucleus in the sample.

Question 7

Number of lines in NMR

Answer 7

2nI+1