Answer 2.1

a) What is the meaning of the acronym „EI“?

EI stands for electron ionization, the former term electron impact is also still in use.

b) EI chiefly creates singly charged ions; however, doubly and triply charged ions may also occur. Which of these are radical ions?

Singly charged: M+., radical ion.

Doubly charged: M2+, even-electron ion.

Triply charged: M3+., radical ion.