Group IV presentation: Frímann, Helgi, Long & Nanna.
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Group IV presentation: Frímann, Helgi, Long & Nanna
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Transcript of Group IV presentation: Frímann, Helgi, Long & Nanna.
Group IV presentation:Frímann, Helgi, Long & Nanna
Resonance enhanced multi-photon ionization.
Spectroscopic tecnique applicable for atoms and small molecules
Accesses excited intermediate states Two or three photon aborbance via LASER
excitation Rydberg states
HCl*
HCl+
H+ + Cl
(i)
(ii)
(1)
(2)
(3)
(4)
number ofphotons:
H* +Cl
H+
H+ Cl*
Cl+
(v) (vi)
(iii) (iv)
H+Cl-
(2)
out
Voltagedevider
HV-2Kv
HX nozzle
TurboPump
TOF
lense
MCP detector
oscilloscope
computer
Excimer Laser
In
út
Dye- Laser
SHG
Time delay200-1200 S
laser control
Pellin Broca prism
SHG control
In
REMPI-TOF
Ion Mass Flight time [µs]
H+ 1 0,94535Cl+ 35 5,591
H35Cl+ 36 5,67037Cl+ 37 5,748
H37Cl+ 38 5,826
H+
35Cl+
H35Cl+
37Cl+
H37Cl+
Impurity
83.75x103
83.70
83.65
83.60
83.55
Wav
enum
ber /c
m-1
393837363534Mass/Z
600x103
400
200
0
Rel
ativ
e in
tens
ity
83.75x103
83.7083.6583.6083.55Wavenumber /cm
-1
O
Q
0
0
7
2 1
6 5 4 3 2 1
H35Cl+H37Cl+
E1+(0+)(0,0) X1+(0+)
600x103
500
400
300
200
100
0
Rel
ativ
e In
tens
ity
83.75x103
83.7083.6583.6083.55Wavenumber /cm
-1
01234567
2 1 0
O
Q
35Cl+
37Cl+
E1+(0+)(0,0) X1+(0+)
400x103
300
200
100
0
Rel
ativ
e In
tens
ity
83.75x103
83.7083.6583.6083.55
Wavenumber /cm-1
Q
O
H+
2 1
0124567
0
3
E1+(0+)(0,0) X1+(0+)
J X1+(0+) cm-1 E1+(0+)(0,0)
0 0 83780.1
1 20.87751224 83793.04279
2 62.61977016 83819.02764
3 125.2012406 83857.76486
4 208.583624 83908.85531
5 312.715854 83970.81229
6 437.5340978 84047.26309
7 582.9617562 84137.93709
Energy level
