Download presentation
Presentation is loading. Please wait.
2
MALDI-TOF: http://www.raust.is/2003/1/13/raust2003-1-13.pdf
3
http://biopedia.org/index.php/MALDI-TOF-MS MALDI-TOF:
4
E n = 1 n = 2 n = 3 : n = 4 l = 0/sl = 1/pl = 2/dl = 3/f :::: :::: ::::. A > H. t.d. C (6e - )
5
n = 1 n = 2 n = 3 :::: E n = 1 n = 2 n = 3 :::: E A A - B A(n=1) + B A(n=2) + B A(n=3) + B A(n=1) A(n=2) A(n=3) r AB
6
1xh 2 E AB AB + + e AB**
7
REMPI = Resonance Enhanced MultiPhoton Ionization 1xh 2xh 2 E AB AB + + e AB** (2 + 1) REMPI
8
REMPI = Resonance Enhanced MultiPhoton Ionization 1xh 2xh 2 E AB AB + + e AB** A + B + + e
9
REMPI = Resonance Enhanced MultiPhoton Ionization 1xh 2xh 3xh AB AB + + e AB** 2 nxh E
10
out Voltage devider HV - 2Kv HX nozzle Turbo Pump TOF lense MCP detector oscilloscope computer Excimer Laser In út Dye- Laser SHG Time delay 200-1200 S laser control Pellin Broca prism SHG control In REMPI- TOF
11
H+H+ CH + CH 2 + C+C+ C2+C2+ C2H+C2H+ C2H2+C2H2+ Magn jóna Ion yield LASER radiation of C 2 H 2 Mw Time of flight
12
Orka HCCH: HCCH*:
13
Orka C2C2 H2H2 HCCH*: C2C2 + +
14
Orka HCCH*:
15
Orka HCCH*: CH 2 C
16
H+H+ CH + CH 2 + C+C+ C2+C2+ C2H+C2H+ C2H2+C2H2+ Magn jóna Ion yield LASER radiation of C 2 H 2 Mw Time of flight
17
C2H2C2H2 Big Organic molecules : Life(?) Interstellar space ???
18
C2H2C2H2 Big Organic molecules : Life(?) Interstellar space ??? C2C2 C CH 2
19
REMPI = Resonance Enhanced MultiPhoton Ionization Resonance excitation to high energy states of neutral species, followed by photon ionization; For example: 1xh 2xh 3xh AB AB + + e AB** 2 nxh E
20
Intensity Mw 1 3512 H+H+ 35 Cl + H 35 Cl + H 37 Cl + 12 C + Two photon resonance excitation= 82842.36 cm -1 Mass spectrum RCl = HCl
21
Mw / rel. Two photon excitation / cm -1 Ion yield REMPI- spectrum H+H+ 35 Cl + H 35 Cl + H 37 Cl + cm -1
22
Mw / rel. 35 Cl + H 35 Cl + H 37 Cl + 2xhv Mw 35 Cl + 37 Cl + H 37 Cl + H 35 Cl + /cm -1
23
2xhv Mw /amu 35 Cl + 37 Cl + H 37 Cl + H 35 Cl + H+H+ /cm -1
24
2xhv/ cm -1 Mw/amu 35 Cl + 37 Cl + H 37 Cl + H 35 Cl + H+H+
26
REMPI = Resonance Enhanced MultiPhoton Ionization 1xh 2xh 2 E AB AB + + e AB** A + B + + e
27
REMPI = Resonance Enhanced MultiPhoton Ionization 1xh 2xh 2 E AB AB + + e AB** A + B + + e AB # # AB + + e A + + B + e A + B + + e
28
A + B/B* REMPI = Resonance Enhanced MultiPhoton Ionization 1xh 2xh 2 E AB AB + + e AB** A + B + + e AB # # AB + + e A + + B + e A + B + + e A + + e B + + e
29
MCP detector Based on http://en.wikipedia.org/wiki/Photofragment-ion_imaging
30
= MCP (Micro Channel Plates = Charge-Couple Device camera Based on http://pubs.rsc.org/en/content/articlelanding/2010/cp/c001233e#!divAbstract http://pubs.rsc.org/en/content/articlelanding/2012/cp/c2cp40822h#!divAbstract
31
= MCP (Micro Channel Plates = Charge-Couple Device camera http://pubs.rsc.org/en/content/articlelanding/2010/cp/c001233e#!divAbstract http://pubs.rsc.org/en/content/articlelanding/2012/cp/c2cp40822h#!divAbstract
32
r(I-Br) I + Br I + Br* tt I + +e + Br* I + + e + Br Based on http://www.chem.queensu.ca/people/faculty/Stolow/Research/QCVibrational.htmlhttp://www.chem.queensu.ca/people/faculty/Stolow/Research/QCVibrational.html Energy
33
Unsymmetric images!? tt Laser beams: Polarized light
34
https://www.physics.umn.edu/research/workshops/fluorescence/Fluoro4.pdf
36
Accelleration region Flight Region Reflectron MS Magnetic Reflector
37
Based on: http://msr.dom.wustl.edu/reflectrons-ion-mirrors/ Without reflectron: With reflectron: Detector t TOF
38
Nozzle 2) Velocity selction by jet cooling / 2) Hraðaval framkvæmt með “gasúðara”
41
1975-1990: Experiments by use of molecular beams/ Detector Collision Molecular beam Detection -Collision complexes determined from scattering patterns John C. Polanyi Nobel prize 1986: Dudley Herzbach Yuan Lee Molec.beam
42
Light /Ljós ? White light/ Hvítt ljós Gulur Rauður Grænn Blár
43
Prism /Gler- strendingur / Bylgju- lengd
44
LASER beam /LASER geisli: Sample /Sýni;sameindir 6 LASERLASER- beam/geisli Monochromatic light / Einlitt ljós (ein bylgjulengd) Anisotropic / mjög stefnuháð High photon concentration / Mikið magn jafnorkuríkra ljóseinda Pulsed or continuus / örstuttir blossar eða samfelld geislun -
45
Laser activity / Laser virkni:
46
He/Ne & Dye laser /Lit-LASER
47
CO 2 and Excimer LASERs
48
The chemical laser /Efna-Laserinn F + H 2 HF* (v´ > 0) + H http://perg.phys.ksu.edu/vqm/laserweb/ch-6/f6s1t9p4.htm
49
The chemical laser /Efna-Laserinn
50
Efna-LASER
51
HOMO LUMO R(A-B) E
52
E
53
E
54
E
55
http://www.raust.is/2003/1/13/raust2003-1-13.pdf
56
http://www.magnet.fsu.edu/education/tutorials/tools/ionization_esi.html http://www.rsc.org/chemistryworld/Issues/2003/February/together.asp http://www.rsc.org/chemistryworld/Issues/2003/February/together.asphtt p://www.rsc.org/chemistryworld/Issues/2003/February/together.asp
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.