Week 1 Flashcards
Basics
1
Q
when to use?
A
-method to determine molecular masses of compounds
-info about the chemical structure
2
Q
Ionization
A
“forced” formation of ions
3
Q
The molecular Ion
A
the ion formed immediately after ionization “parent ion”
4
Q
Type of the ionization
GC-MS;LC-MS
A
GC-HARD
LC-SOFT
5
Q
Hard ionization
A
An electron goes out from a molecule
creating a positively charged (cationic) radical
mass ionized molecule=mass molecule
6
Q
Stability/life span of molecular ions
A
When M+ is stable for >10^-5 seconds, then only little fragmentation
Stability is defined by the molecular structure
7
Q
Soft ionization
A
molecule accepts or donates a proton
creating a positive or negatively charged molecule
mass ionized molecule=mass molecule + or - 1
