ees-REMPI

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ees-REMPI
Excimer Laser
Pellin Broca prism
SHG
DyeLaser
out
Time delay
200-1200 mS
SHG control
In
HX
nozzle
laser control
lense
TOF
In
REMPITOF
út
Turbo
Pump
oscilloscope
MCP detector
computer
Voltage
devider
HV
-2Kv
0
LASER radiation of C2H2
Ion
yield
C2H2+
-2
C+
C2+
Magn jóna
-4
H+
x10
3
-6
-8
C2H+
CH+
-10
-12
CH2+
-14
0
5
10
Mw
15
Ion m as s (am u)
20
25
Time of flight
30
Orka
HCCH*:
HCCH:
+
Orka
C+2
HCCH*:
C2
H2
Orka
HCCH*:
Orka
HCCH*:
C
CH2
0
LASER radiation of C2H2
Ion
yield
C2H2+
-2
C+
C2+
Magn jóna
-4
H+
x 10
3
-6
-8
CH+
C2H+
-1 0
CH2+
-1 2
-1 4
0
5
10
Mw
15
Io n m a s s (a m u )
20
25
Time of flight
30
Interstellar
space
C2H2
???
Big
Organic
molecules
:
Life(?)
Interstellar
space
C2H2
C
CH2
???
C2
Big
Organic
molecules
:
Life(?)
2
E
REMPI =
Resonance
Enhanced
MultiPhoton
Ionization
Resonance excitation to high
energy states of neutral species,
followed by photon ionization;
For example:
AB+
+e
AB**
1xhn
2xhn
3xhn
nxhn
AB
x10
Intensity
Mass spectrum RCl = HCl
H35Cl+
-26.0
H+
Two photon resonance
excitation=
82842.36 cm-1
-26.5
35Cl+
-27.0
-27.5
H37Cl+
-28.0
12C+
-28.5
0
1
100
200
12
300
400
35
Mw
82833.6cm
30
40
H+
82836.36
j´=9
H35Cl+
82839.8
j´=8
35Cl+
H37Cl+
82842.36
j´=7
82842.88
50
82844.84
j´=6
82846.44
j´=5
60
0
Ion
yield
0
70
0
Two
photon
excitation /
cm-1
82847.8
j´=4
82849.4 cm
j´=2
8284
j´=3
-1
REMPIspectrum
0
80
0
0
82.835
200
82.840
82.845
3
x10
400
82.850
cm-1
600
Mw / rel.
800
82833.6cm
-1
30
82836.36
j´=9
40
H35Cl+
82839.8
j´=8
35Cl+
82842.36
j´=7
82842.88
30,0323
82844.84
35Cl+ j´=6
H35Cl+
37Cl+
H37Cl+
32,1132
34,2637
36,484
82847.8
j´=4
82846.
j´=5
Mw
38,7739
82849.4 cm
j´=2
-1
8
j´
41,1336
43,5629
0
200
82851,74667
82849,82667
82847,992
82846,24
82844,12727
82842,36
82840,71429
80
82838,424
46,0619
82835,67
82833,6
x10
0
0
0
0 50
0
0
0
0
0
0
0
0
0
00
00
00 60
00
00
00
00
00
00
00
00
00
00
00
500
000
500
00070
H37Cl+
2xhv /cm-1
400
600
Mw / rel.
800
15697
14270
12843
11416
9989
8562
7135
5708
4281
2854
1427
0
-1427
-2854
-4281
-5708
-7135
-8562
-9989
-11416
-12843
-14270
-15697
-17124
-18551
-19978
-21405
-22832
-24259
-25686
-27113
-28540
-29967
38,4646
34,849
1
82833,6
1,32098
82838,768
0,723624
2xhv
/cm-1
33,1081
82842,88
36,6345
82846,82857
35Cl+
Mw /amu
H+
40,3393
82850,68
H37Cl+
37Cl+
H35Cl+
H37Cl+
82850,89333
82849,4
82847,992
82846,63429
H+
82845,24
35Cl+
82843,59273
82842,17714
82840,89714
82839,456
37Cl+
82837,048
82835,21
40,3393
39,2403
38,1565
37,0878
Mw/amu
36,0344
34,9961
33,973
32,965
31,9723
1,23655
1,0504
0,879423
82833,6
0,723624
-29715
-28300
-26885
-25470
-24055
-22640
-21225
-19810
-18395
-16980
-15565
-14150
-12735
-11320
-9905
-8490
-7075
-5660
-4245
-2830
-1415
0
1415
2830
4245
5660
7075
8490
9905
1320
2735
150
565
H35Cl+
2xhv/
cm-1
82852,38667
37
H Cl
37
+
Cl
35
H Cl
35
+
+
Cl
+
+
H
85.32
85.33
85.34
85.35
-1
ncm 
85.36x10
3
(4)
H+
+ Cl
Cl+
H+
(ii)
(v)
number of
photons:
HCl+
(3)
(vi)
H+ Cl*
H* +Cl
(i)
(iii)
(iv)
HCl*
H+Cl-
(2)
(1)
(2)

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