Agilent Technologies 5975 Operation Manual page 181

Table 24
Species
H
CH
C
H
H
CH
t-C
NH
Table 25
Molecule
5975 Series MSD Operation Manual for MassHunter
Reagent gas proton affinities
Proton affinity
kcal/mole
100
2
127
4
H 160
2 4
O 165
2
S 170
2
OH 182
3
H 195
4 10
207
3
Proton affinities of selected organic compounds for PCI
Proton affinity
(kcal/mole)
Acetaldehyde 185
Acetic acid 188
Acetone 202
Benzene 178
2-Butanol 197
Cyclopropane 179
Dimethyl ether 190
Ethane 121
Ethyl formate 198
Formic acid 175
Hydrobromic acid 140
Hydrochloric acid 141
Chemical Ionization Theory
Reactant ion
formed
+ (m/z 3)
H
3
CH 5 + (m/z 17)
C 2 H 5 + (m/z 29)
O + (m/z 19)
H
3
S + (m/z 35)
H
3
+ (m/z 33)
CH OH
3 2
+ (m/z 57)
t-C H
4 9
+ (m/z 18)
NH
4
Molecule
Methyl amine
Methyl chloride
Methyl cyanide
Methyl sulfide
Methyl cyclopropane
Nitroethane
Nitromethane
n-Propyl acetate
Propylene
Toluene
trans-2-Butene
Trifluoroacetic acid
A
Proton affinity
(kcal/mole)
211
165
186
185
l80
185
180
207
179
187
180
167
181