Mass Spectroscopy(MS)
EI electron impact, electron impact ionization, electron bombardment ionization ( ) IUPAC electron ionization ( ) ( 31 (1997))
MS m/z( / ) 1
C 12.011 C 98.9% 13 C 1.1%
m/z m z m/z M 1 M + 2 M 2+ M 2+ M (m/2) 1 n M n+ 2 3 m mm + 1 1
(Cl 2 ) 35 Cl 76% 37 Cl 24% 3 35 Cl 2 70 35 Cl 37 Cl 72 37 2 74
102 OH 17 85 EI MALDI ESI
(M + ) M + conjugated olefin alicyclic static chain thiol ketone ester ether carboxylic acid
Electron impact electron ionization
(Ar, Xe)
MALDI Matrix Assisted Laser Desorption/Ionization MALDI (Matrix) 337nm Analyte 100nm nsec http://www.shimadzu-biotech.jp/products/tofms/princpl1.html
EI-MS ( - 18) TBDMS Bu ( )
EI-MS ( ) FAB-MS FAB-MS ESI-MS FD-MS FAB-MS(+) FAB-MS ESI-MS
(m) (z) m/z
( ) V(V=2 8 kv) ( )
( ) ( ) R
(Time-of-flight, ) L t (1 ) v (1 ) TOF
(EI,FI) (FD) (FAB) EI.FI ( ) EI,CI FI-MS
EI,CI FI EI-MS GC- MS(HRGC-MS) ( ) ( ) FRIT-FAB ESI,EI
GC or LC