intense field femtosecond laser interactions amp talkjune 2004 ultrafast laser interactions with...
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![Page 1: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/1.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
Ultrafast Laser Interactions
with atoms, molecules, and ions
Jarlath McKenna
Supervisor: Prof. Ian Williams
![Page 2: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/2.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
The Experiment….
QUB Ion Beam Apparatus
![Page 3: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/3.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
The Experiment….
QUB Ion Beam Apparatus
![Page 4: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/4.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
The Experiment….
QUB Ion Beam Apparatus
B
IonsMagnet
Aperture
![Page 5: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/5.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
The Experiment….
QUB Ion Beam Apparatus
![Page 6: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/6.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
The Experiment….
QUB Ion Beam Apparatus
![Page 7: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/7.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
The Experiment….
UCL Neutral Target ApparatusFocussed Laser Beam
![Page 8: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/8.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
and scanning techniques….
z
x
y
Intensity Scan
focussed laser direction
ion beam direction
![Page 9: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/9.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
and scanning techniques….
z
x
y
Intensity Selective Scan
focussed laser direction
ion beam direction
![Page 10: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/10.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
and scanning techniques….
z
x
y
Intensity Selective Scan
focussed laser direction
ion beam direction
![Page 11: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/11.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
and scanning techniques….
z
x
y
Intensity Selective Scan
focussed laser direction
ion beam direction
![Page 12: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/12.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
and scanning techniques….
z
x
y
Intensity Selective Scan
focussed laser direction
ion beam direction
![Page 13: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/13.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
and scanning techniques….
z
x
y
Intensity Selective Scan
focussed laser direction
ion beam direction
![Page 14: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/14.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
…Sequential ionization
Walker et al PRL, 73, 1227 (1994)
![Page 15: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/15.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
S
…Sequential ionization
Walker et al PRL, 73, 1227 (1994)
![Page 16: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/16.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
SNS
…Nonsequential ionization
Walker et al PRL, 73, 1227 (1994)
![Page 17: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/17.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
SNS
…Nonsequential ionization
Walker et al PRL, 73, 1227 (1994)
![Page 18: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/18.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Z Position (mm)
Sig
nal (
arb.
)
Linear
Circular
…Xe results!!
Xe → Xe+
![Page 19: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/19.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Z Position (mm)
Sig
nal (
arb.
)
Linear
Circular
…Xe results!!
Xe → Xe+
![Page 20: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/20.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Sig
nal (
arb.
)
Z Position (mm)
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Z Position (mm)
Sig
na
l (a
rb.)
Linear
Circular
…Xe results!!
Xe → Xe2+
Xe+ from Xe
![Page 21: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/21.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
Sig
nal (
arb.
)
Z Position (mm)
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Z Position (mm)
Sig
na
l (a
rb.)
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Sig
na
l (a
rb.)
Linear
Circular
…Xe results!!
Xe → Xe3+
Xe+ from Xe
Xe2+ from Xe
![Page 22: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/22.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
Sig
nal (
arb.
)
Z Position (mm)
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Z Position (mm)
Sig
na
l (a
rb.)
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Sig
na
l (a
rb.)
Sig
na
l (a
rb.)
Linear
Circular
…Xe results!!
Xe+ → Xe3+Xe2+ from Xe
Xe3+ from Xe
Xe+ from Xe
![Page 23: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/23.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
Sig
nal (
arb.
)
Z Position (mm)
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Z Position (mm)
Sig
na
l (a
rb.)
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Sig
na
l (a
rb.)
Sig
na
l (a
rb.)
Linear
Circular
…Xe results!!
Xe2+ → Xe3+
Xe+ from Xe
Xe2+ from Xe
Xe3+ from Xe
Xe3+ from Xe+
![Page 24: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/24.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
Sig
nal (
arb.
)
Z Position (mm)
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Z Position (mm)
Sig
na
l (a
rb.)
-15 -10 -5 0 5 10 15
0.0
0.2
0.4
0.6
0.8
1.0
Sig
na
l (a
rb.)
Sig
na
l (a
rb.)
-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50
0.0
0.2
0.4
0.6
0.8
1.0
Linear
Circular
…Xe results!!
Xe+ → Xe2+
Xe+ from Xe
Xe2+ from Xe
Xe3+ from Xe
Xe3+ from Xe+
Xe3+
from Xe2+
![Page 25: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/25.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
Vibrational Trapping in H2+?
0
1
2
3
1sg
2pu
Internuclear separation R (a.u.)1 2 3 4 5 6 7 8 9 10
0
-1
-2
-3
-4
-5
Fie
ld-d
ress
ed p
oten
tial e
nerg
y (e
V)
v = 0
v = 9
v = 5v = 4v = 3
H neutrals from H2+
![Page 26: Intense Field Femtosecond Laser Interactions AMP TalkJune 2004 Ultrafast Laser Interactions with atoms, molecules, and ions Jarlath McKenna Supervisor:](https://reader036.vdocuments.mx/reader036/viewer/2022081504/56649d0c5503460f949e0c84/html5/thumbnails/26.jpg)
AMP Talk June 2004
Intense Field Femtosecond Laser Interactions
…So what’s next??
Position Sensitive Detector
resolve vibrational levels of H2+
Cool vibrational levels of H2+
electrostatic ion trap
electric quadrupole
Shorter pulses (~10 fs)hollow fibre (gas cell)freeze vibrational motion
Frequency double laser (i.e. 800nm → 400nm)larger shift of photon dressed states of H2
+