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1 5 5.1 mass spectrometer electron impact, EI 5.1 :;"< 789 =>? *!"#$%& '%&(),,,-./ 0.12% ev molecular ion #"$%& M M e!"!"'() #" m/z ; m = z = 1 mass spectrum, 1
2 MS 5.2 a. MS 5.2 m/z normal molecular mass CH 2 CH 2 CH 2 (C 5 H 12 ) (M ) m/z = 72 C C C1 C2 C2 C3 m/z = 43 (base peak) CH 2 CH 2 CH 2 m/z = 43 CH 2 CH 2 CH 2 m/z = 29 CH 2 CH 2 CH 2 m/z = 72 CH 2 CH 2 CH 2 m/z = 57 CH 2 CH 2 CH 2 m/z = 15 2
3 CHCH 2 (C 5 H 12 ) 57 M C (C 5 H 12 ) M 5.4 3
4 2 MS 5.3 m/z = 57 2 CHCH 2 CHCH 2 m/z = 72 m/z = 57 t m/z = C m/z = 72 C m/z = m/z = 92 M 1 m/z = 91 H CH 2!" m/z = 92 m/z = 91 m/z = 91 4
5 5.5 m/z H H CH 2 CH 2 CHCH 2 CH 2 =CHCH 2 m/z = 43 m/z = 42 m/z = 41 b. m/z 1 2 M1 M2 M1 12 C 13 C 12 C C C 13 C 5 M
6 M2 79 Br 81 Br Cl 37 Cl MS C C H H N N O O O S S S Si Si Si F Cl Cl Br Br CH 2 CH 2 Br
7 Cl 43 CH M 15 M m/z = Br 81 Br m/z = 43 m/z m/z = Cl m/z = 43 m/z = M 15 Cl C C C Cl 343 kj mol 1 C C 355 kj mol 1 35 Cl 37 Cl CH CH m/z = 78 m/z = 80 CH= 35 Cl CH= 37 Cl m/z = 63 m/z = 65 CH m/z = 43 Cl 7
8 c m/z = m/z = 45 m/z = 74 CHCH 2 m/z = 74 CH 2 CH HCCH2 m/z = 59 m/z = 45 CH HCCH 2 CHCH 2 M MS 2 m/z = 56 M 18 H 2 O M 18 8
9 H H 2 C H 2 C 2 H 2 C CH 2 m/z = 74 m/z = 56 m/z = 56 m/z = 31 m/z = m/z = 43 CH 2 CH 2 CH 2 m/z = 74 HCH m/z = 31 HCH CH 2 CH 2 CH 2 CH 2 CH 2 M d. 2 MS MS 5.10 m/z =
10 M 1 O CCH 2 m/z = 72 C O m/z = 43 CH 2 CH 2 C O m/z = 57 O CCH m/z = 44 M C H McLafferty H H O CH 2 m/z = 72 H m/z = 44 CH 2 CH 2 10
11 O CH 2 CH 2 CH 5.11 MS
12 O C H H C O CO m/z = 106 m/z = 105 m/z = m/z m/z amu 72 C 5 H 12 C 4 H 8 O C 4 H 5 F C 3 H 6 N 2 C 3 H 4 O amu H S C N O F Cl Cl Br Br
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27.2.9 TOF-SIMS SIMS TOF-SIMS SIMS Mass Spectrometer ABCDE + ABC+ DE + Primary Ions: 1 12 ions/cm 2 Molecular Fragmentation Region ABCDE ABCDE 1 15 atoms/cm 2 Molecular Desorption Region Why TOF-SIMS?
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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
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