PHOTOFRAGMENTATIONS, STATE INTERACTIONS AND ENERGETICS OF HALOGEN CONTAINING MOLECULES: TWO-DIMENSIONAL (2+n) REMPI
ÁGÚST KVARAN, et al. Science Institute, University of Iceland, Dunhaga 3, 107 Reykjavík, Iceland.
Oral presentation at PSI / SLS, June, 2012.
Voltagedevider
HV-2Kv
RX nozzle
TurboPump
TOF
lense
MCP detector
oscilloscope
computer
Excimer Laser
In
out
Dye- Laser
SHG
Time delay200-1200 mS
laser control
Pellin Broca prism
SHG control
In
out
REMPI = Resonance Enhanced MultiPhoton Ionization
1xhn
2xhn
2
E
AB
AB+ + e
AB**
(2 + 1) REMPI
REMPI = Resonance Enhanced MultiPhoton Ionization
1xhn
2xhn
2
E
AB
AB+ + e
AB**
A + B+ + e
REMPI = Resonance Enhanced MultiPhoton Ionization
1xhn
2xhn
2
E
AB
AB+ + e
AB**
A + B+ + e
AB # #
AB+ + e
A+ + B + e
A + B+ + e
A + B/B*
REMPI = Resonance Enhanced MultiPhoton Ionization
1xhn
2xhn
2
E
AB
AB+ + e
AB**
A + B+ + e
AB # #
AB+ + e
A+ + B + e
A + B+ + e
A+ + e
B+ + e
(2 + n)REMPI; n = 1,2,.....
.....A+..............B+..........................AB+..... / Mw
I(M+)
Laser excitation / cm-1
2D - REMPI
• PHOTOFRAGMENTATIONS, • STATE INTERACTIONS • ENERGETICS
I. Small molecules:Diatomic moleculesLinear molecules
II. “Bigger molecules”Polyatomic molecules
Data:Rotational (J) structureresolution
Data: Vibrational (v) structureresolution
Analysis (J-dependent):•Signal Intensities•Power dependences•Line-shifts•Line-widths
Analysis (v-dependent):• Signal intensities• Power dependences
Results (J-dependent): • Energetics• n,(2+n)• State interactions• Photofragmention• Lifetimes
Results (v-dependent): •Energetics• n,(2+n)• State interactions• Photofragmention
-28.5
-28.0
-27.5
-27.0
-26.5
-26.0
x103
4003002001000
Intensity
Mw1 3512
H+
35Cl+
H35Cl+
H37Cl+
12C+
Two photon resonance excitation=82842.36 cm-1
Mass spectrum RCl = HCl
80
70
60
50
40
30x1
03
8006004002000
82849.4 cm-1
j´=2
82848.76j´=3
82847.8j´=4
82846.44j´=5
82844.84j´=6
82836.36j´=9
82842.36j´=7
82839.8j´=8
82833.6cm-1
82842.88
Mw / rel.
35Cl+
H35Cl+
H37Cl+
30,0323
32,1132
34,2637
36,484
38,7739
41,1336
43,5629
46,0619
82
83
3,6
82
83
5,6
7
82
83
8,4
24
82
84
0,7
14
29
82
84
2,3
6
82
84
4,1
27
27
82
84
6,2
4
82
84
7,9
92
82
84
9,8
26
67
82
85
1,7
46
67-30000-28500-27000-25500-24000-22500-21000-19500-18000-16500-15000-13500-12000-10500-9000-7500-6000-4500-3000-15000
150030004500600075009000
10500120001350015000
2xhv
Mw
35Cl+
37Cl+H37Cl+
H35Cl+
/cm-1
r(H-X)
Energy
HX
H X ** H+--X-
HX+ H+ X+
e-
e-
+
HX REMPI:
IE limit
v´
J´
v´
J´
r(H-X)
Energy
HX
H X ** H+--X-
HX+ H+ X+e-
HX+ H+ X+e-
e-
+
HX REMPI:
IE limit
v´
J´
v´
J´
Rel
ativ
e in
ten
sity
/a
.u.
81.45x103
81.4081.3581.3081.2581.2081.15Wavenumber 2h/cm
-1
I1 Q
2468
P
234567
R
2 3 4 5 6 7 8
S
2 3 4 5 6
H79Br+
r(H-X)
Energy
HX
H X ** H+--X-
HX+ H+ X+e-
HX+ H+ X+e-
e-
+
HX REMPI:
IE limit
v´
J´
v´
J´
Rel
ativ
e in
ten
sity
/a
.u.
81.45x103
81.4081.3581.3081.2581.2081.15Wavenumber 2h/cm
-1
I1 Q
2468
P
234567
R
2 3 4 5 6 7 8
S
2 3 4 5 6
H79Br+
Re
lati
ve i
nte
ns
ity
/a
.u.
81.45x103
81.4081.3581.3081.2581.20Wavenumber 2h/cm
-1
I1 Q2468
P234567
R2 3 4 5 6 7 8
S2 3 4 5 6
H79Br+
r(H-X)
Energy
HX
H X ** H+--X-
HX+ H+ X+e-
HX+ H+ X+e-
e-
+
HX REMPI:
IE limit
v´
J´
v´
J´
Re
lati
ve
in
ten
sit
y
/a.u
.
80.05x103
80.0079.9579.9079.85Wavenumber 2h /cm
-1
Q0123456
V1(m+8)
79Br
+
Br atomicline7
270 cm-1
350x103
300
250
200
150
100
50
Re
lati
ve
in
ten
sit
y
/a.u
.
81.45x10381.4081.3581.3081.2581.2081.15
Wavenumber 2h/cm-1
I1 Q
2468
P234567
R2 3 4 5 6 7 8
S2 3 4 5 6
79Br+
H79Br+
V 1S+(v´=m+10)
500x103
400
300
200
100
0
Rel
ati
ve
inte
ns
ity
/a
.u.
80.00x10379.9579.9079.85
Wavenumber 2h /cm-1
Q0123456
V1
(m+8)
H79
Br+
79Br
+
Atomic line
7
180x103
160
140
120
100
80
E [
cm-1
]
4321r [Å]
H + Cl*(2P)
H* + Cl
H + Cl+
H+ + Cl
X(HCl+)
2
HCl** 1
F(HCl*)
1 V(H+Cl
-)
1
180x103
160
140
120
100
80
E [
cm-1
]
4321r [Å]
H + Cl*(2P)
H* + Cl
H + Cl+
H+ + Cl
X(HCl+)
2
HCl** 1
F(HCl*)
1 V(H+Cl
-)
1
85.3685.3585.3485.33x10
3
H35Cl+
35Cl+
Q
J´=J´´ = 9 8 7 6 5 4 3 2
HCl, F1D2
2h n / cm-1
Inte
nsi
ty
4x106
3
2
1
0
-1
-2
Rel
ativ
e In
ten
sity
86.4x10386.286.085.885.6
Wavenumber 2hv/cm-1
85.9285.9085.8885.86
x103
35Cl+
H35Cl+
Q
QQ 05
0
0
2468
V1
E1 V1
r(H-X)
Energy
HX
H X ** H+--X-
HX+/HX+ H+ X+
e-
e-
+
HX REMPI:
IE limit
v´
J´
v´
J´
State
Interactions ?
(1) / y0 (2) / y01 2
c1y01
ya
c2y02= +
yb =c1
´y0 c2´y0-
1 2
c1c2+2 2
= 1
E
WEci
2
4
2
12
12
2
2
E
W 12:
Interaction
strength
(1) / y0 (2) / y01 2
c1y01
ya
c2y02= +
yb =c1
´y0 c2´y0-
1 2
c1c2+2 2
= 1
E
WEci
2
4
2
12
12
2
2
E
(1) / y0 (2) / y01 2
c1y01
ya
c2y02= +
yb =c1
´y0 c2´y0-
1 2
c1c2+2 2
= 1
E
WEci
2
4
2
12
12
2
2
E( ) E(J´)DE
E
85.3685.3585.3485.33x10
3
H35Cl+
35Cl+
Q
J´=J´´ = 9 8 7 6 5 4 3 2
HCl, F1D2
2h n / cm-1
Inte
nsi
ty
87.6x103
87.4
87.2
87.0
86.8
E v
´,J´
/ cm
-1
-120 -100 -80 -60 -40 -20 0 EJ´+1,J´ / cm
-1
V state
v´=13
v´=14
v´=1
F state
J´=8 J´=8
x
DEJ´=8 =11.3 cm-1
HCl:
F1D2
V1 S
c12 c2
2
122 ,WEci
X ?
85.3685.3585.3485.33x10
3
H35Cl+
35Cl+
Q
J´=J´´ = 9 8 7 6 5 4 3 2
HCl, F1D2
2h n / cm-1
Com-press-ion
E x p a n s i o n
Inte
nsi
ty
87.6x103
87.4
87.2
87.0
86.8
E v
´,J´
/ cm
-1
150100500-50-100 dEJ´+1,J´ / cm
-1
V state
v´=14
v´=1
F state
J´=8
J´=7
J´=8
J´=7
F (v´=1)
fig.3c
87.6x103
87.4
87.2
87.0
86.8
E v
´,J´
/ cm
-1
150100500-50-100 dEJ´+1,J´ / cm
-1
V state
v´=14
v´=1
F state
J´=8
J´=7
J´=8
J´=7
F (v´=1)
fig.3c
DE
2/120
201
2
1202
01 )(4
2
1
2
1EEWEEEi
87.6x103
87.4
87.2
87.0
86.8
E v
´,J´
/ cm
-1
-120 -100 -80 -60 -40 -20 0 EJ´+1,J´ / cm
-1
V state
v´=13
v´=14
v´=1
F state
J´=8 J´=8
x
DEJ´=8 =11.3 cm-1
HCl:
F1D2
V1 S
.6=c12 c2 = 0.42
122 ,WEci
X ?6 cm-1
from line shifts
r(H-X)
Energy
HX
H X ** H+--X-
HX+/HX+ H+ X+e-
e-
+
HX REMPI:
IE limit
v´
J´
v´
J´c1
2 c22
? X+
r(H-X)
Energy
HX
H X ** H+--X-
HX+/HX+ H+ X+e-
e-
+
HX REMPI:
v´
J´
v´
J´
H + X
X+
r(H-X)
Energy
HX
H X ** H+--X-
HX+/HX+ H+ X+e-
e-
+
HX REMPI:
v´
J´
v´
J´
HX*** H + X*
X+
r(H-X)
E
HX
H+--X-
HX+/HX+ H+ X+e- HX REMPI:
v´
J´
v´
J´c1
2 c22
X+
X
X*
ac1 b2c2+2 2
I (HX+) =
bc1 a2c2+2 2
I (X+) =
Ry: I.P./V:
)1(
)1(
)(
)(22
22
c
c
HXI
XI
c22
c22
a = a2(X+)/a(HX+)g= b(X+) /a2(X+)
ag= b(X+)/a(HX+)
r(H-X)
E
HX
H+--X-
HX+/HX+ H+ X+e- HX REMPI:
v´
J´
v´
J´c1
2 c22
X+
X
X*
)1(
)1(
)(
)(22
22
c
c
HXI
XI
c22
c22
a= a2(X+)/a(HX+)
aag
ag= b(X+)/a(HX+)
1 2 3 4 5 6-0.2
-1.66533453693773E-16
0.2
0.4
0.6
0.8
1
1.2
J'
Exp.Q
1 2 3 4 5 60
0.2
0.4
0.6
0.8
1
1.2
J'
i=35 i=37
I(i C
l+)/
I(H
i Cl+
)
Exp.Q
Calc. V,v´ = 20
Calc. V,v´=20
j3S-1; n´=0
isotopomers H35Cl H37ClJ´ closest resonances(J´res) 2 2|DE(J´res) | / cm-1 20.6 14.7W12(J´res) / cm-1 6.5 5.8c1
2 (c22) (J´res) 0.89(0.11) 0.81(0.19)
a 3.5 4.2ag 14 x 10-3 13 x 10-3
HiCl j 3S-1
>
><
»
»
K. Matthíasson et al.J. Chem. Physics,134, 164302, (2011)
r(H-X)
Energy
HX
HX**
H+--X-
HX+/HX+ H+ X+e- HX REMPI:
v´
J´
v´
J´
H + X
X+
j 3S-1
t 3S+1 S/O
-0.005
0.005
0.015
0.025
0.035
0.045
0.055
2 3 4 5 6 7
J'
-0.005
0.005
0.015
0.025
0.035
0.045
0.055
2 3 4 5 6 7 8
J'
H35Cl f 3D2 f 3D1
I(35
Cl+
)/I(
H35
Cl+
)
States f3D2 f3D1
J´ closest resonances(J´res) 5 6|DE(J´res) | / cm-1 17.7 27.9W12
max(J´res)/ cm-1 2 4c1
2(J´res) 0.987 0.979a 4.0 0.5ag »0 1.0 x 10-3
<
>
Exp.Q
Calc.V,v´=9
Exp.S
Calc.V,v´=8
<
-0.005
0.005
0.015
0.025
0.035
0.045
0.055
2 3 4 5 6 7
J'
-0.005
0.005
0.015
0.025
0.035
0.045
0.055
2 3 4 5 6 7 8
J'
H35Cl f 3D2 f 3D1
I(35
Cl+
)/I(
H35
Cl+
)
Exp.Q
Calc.V,v´=9
Exp.S
Calc.V,v´=8
» No dissociation
No predissociation pathway
Dissociation:
Predissociation by S/Ocouplings via “Gateway Rydberg states (1P,3P)”:
0 1 2 3 4 5 6 7 80
0.2
0.4
0.6
0.8
1
1.2
J'
I(37
Cl+
)/I(
H37
Cl+
)
H37Cl j 3S- (0+)
Exp. Q
89.8
89.6
89.4
89.2
x103
J´=0
J´=6
J´=6 v´=21
J´=6 v´=20
J´=0
J´=0
:
:
j 3S- (0+), v´=0
V 1S(0+)
H37Cl
Near resonance
T SW´=0 W´=0
E/c
m-1
0 1 2 3 4 5 6 7 80
0.2
0.4
0.6
0.8
1
1.2
J'
I(37
Cl+
)/I(
H37
Cl+
)
Calc. V,v´=20 V,v´=21
H37Cl j 3S- (0+)
Exp. Q
V´ states v´=20 v´=21J´ closest resonances(J´res) 6|DE(J´res) | / cm-1 65W12
(J´res) / cm-1 25 25c1
2(J´res) 0.82 (a ag) 4.0(52 x 10-3) 4.0(52 x 10-3)
Rel
ativ
e In
ten
sity
77.98x103
77.9677.9477.9277.9077.8877.86
Wavenumber 2hv/cm-1
Q
02489 7 6
E1
79Br
H79
Br
10
H79Br
79.8
79.6
79.4
79.2
x103
J´=0
J´=6
J´=9J´=6 v´=m+5
H79Br
E 1S(0+), v´=0
J´=9 v´=m+4
J´=0
V 1S(0+)
Off resonance
S SW´=0 W´=0
J´=6
J´=0
E/c
m-1
0 1 2 3 4 5 6 7 8 90
0.05
0.1
0.15
0.2
0.25
0.3
0.35
J'
0 1 2 3 4 5 6 7 8 90
0.2
0.4
0.6
0.8
1
1.2
1.4
J'
H79Br, E(v´=0)
I(79Br+)/I(H79Br+) Linewidth/cm-1
Ene
rgy
3.02.52.01.51.00.5
E(1)
V(m+7)
F(1)
G(C1P1)
(JL)
(JL)
(JL)(SO)
(SO)
JL
R(t3S+1) R(A1P, a3P)
R(t3S+1)
G(C1P1)
R(A1P, a3P)
V1S+(m+7)
E1S+(1)
F1D2(1)
En
erg
y
(SO)
(JL)(SO)
HBrÁ. Kvaran et al., J. Chem. Physics, 136, 214315,(2012)
-
H+ X-
XH
HX**
{ }..
HX
:: ::
:: :.
+
-
.
+
“Summary”:
Photodissociation,
State interactions,
Energetics...
::Victor Huasheng Wang
Kristján MatthíassonJingming Long
Helgi Rafn Hróðmarsson
Coworkers:
... HBr,HI..
...HCl, HBr..
.....HCl,...
.
..RX..
::Kári Sveinbjörnsson
Hafdís Inga Ingvarsdóttir
Eiríkur ÞórirBaldursson
Andras Bodi
Coworkers:
CH3 I
CF 3Br
Ab initio
CH2Br
2
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