Detector
1
a h 0 v Detector F ion z 0 C. Blondel , C. Delsart, C. Drag and R. J. Peláez Laboratoire Aimé-Cotton, Centre national de la recherche scientifique, bâtiment 505, université Paris-sud, F-91405 Orsay cedex, France Pulsed photodetachment microscopy and the electron affinity of Iodine Experimental set-up qF a 0 max 2 az R 2 3 0 3 2 a N Interfrange distance a z N R i 3 0 0 max 3 a z R Ai R j 0 2 0 2 4 1 ) ( Pulsed laser New result : electron affinity of 127 I 7 6 5 4 3 2 1 8 9 10 11 12 13 1 : Source and simple lens doublet (“Einzellens") 2,5,9,10 : Deflection plates 3,6,8 : Simple lenses 4 : Wien filter 7 : Deflection 11 : Focalisation quadrupole 12 : Deceleration plates 13 : Interaction zone C D F U Pumped QCW 20 Hz, 515 nm Ti:Sa QCW, 150 µs Dual polarization stabilized He-Ne Sigmameter Q- CW Lambdameter WSU uncertain. +/- 0.041 m -1 Frequency-doubled Nd:YAG 25 mJ @ 532 nm Pulsed Ti:Sa ~ 10 mJ @ 810 nm BBO ~ 1 mJ @ 405 nm 15 ns L. Cabaret and C. Drag, Eur. Phys. J. Appl. Phys. 37 (2006) 65 L. Cabaret, Appl. Phys. B 94 (2009) 71 1 S 0 2 P 3/2 F 1 = 5/2 F 2 = 1 F 2 = 2 F 2 = 3 F 2 = 4 I [F 2 ]=2 F 2 +1 14.097 m -1 6.5575 m -1 2.46 m -1 e A = 2 467 287(3) m -1 Electron Count Radius (mm) 2467275 2467280 2467285 2467290 2467295 0 100 200 300 400 Laser pulse energy (m icroJ) E lectron affinity (m -1 Electron affinity (m -1 ) Laser pulse energy (µJ) Quantum parameters : Wavelength scale Number of rings Classical parameters Radial current density Principle: Y.N. Demkov et al., JETP Lett. 34 (1981) 403 Photodetachment microscopy: C. Blondel et al., Phys. Rev . Lett. 77 (1996) 3755 Photoionization microscopy: C. Nicole et al., Phys. Rev . Lett. 88 (2002) 133001 Molecular photodetachment microscopy : C. Delsart et al., Phys. Rev . Lett. 89 (2002) 183002 Highest height Maximum radius 3 2 0 2 mqF 0 = 0.045 mm a = 0.35 mm R F = 427 Vm -1 = 0,926 ± 0,002 cm -1 R max j 14 15 14 : Laser 15 : Column of constant F 16 : MCP 17 : Phosphor screen 18 : CCD negativ e ion neutral atom h e A 18 1 6 17 Accumulation Barycenter Photodetachment microscopy 2 ' 2 1 2 1 U F C D h A Tunable single longitudinal mode. Long & short time stabilization Nanosecond pulse Uncertainty ≈0.8 m -1 Energy ≈ 400mJ Main properties 1980 1990 2000 2010 Y ear Electron A finity (eV) 3.05899 3.05904 3.05909 3.05914 3.05919 E xperim ent 2467275 2467280 2467285 2467290 2467295 0 20 40 60 80 100 Photoelectron average energy (m -1 ) Electron afinity (m -1 ) 2.7 2.8 2.9 3.0 3.1 3.2 1980 1990 2000 2010 Year Electron A finity Theory Experim ent Electron Affinity (eV) E l e c t r o n A f f i n i t y ( e V ) Ponderomotive effect : electron oscillations in electromagnetic waves. 2 2 2 P 4 m E q U R. J. Peláez et al. J. Phys. B. 42 (2009) 125001 e A( 127 I) = 2 467 286.7 (28) m -1 = 3.059 0453 (36) eV Ponderomotive effects have been negligible, for two reasons: i) Blue wavelength (~ 405 nm) ii) Low energy ≈ 400µJ 41 st EGAS, Gdansk, 8-11 July 2009 Doppler Effect
description
D. F. 7. C. 8. U. 6. 1 : Source and simple lens doublet (“Einzellens") 2,5,9,10 : Deflection plates 3,6,8 : Simple lenses. 10. 4. 5. 12. Detector. 2. 4 : Wien filter 7 : Deflection 11 : Focalisation quadrupole 12 : Deceleration plates 13 : Interaction zone. 14 : Laser - PowerPoint PPT Presentation
Transcript of Detector
ah 0v
Detector
Fion
z0
C. Blondel, C. Delsart, C. Drag and R. J. PeláezLaboratoire Aimé-Cotton, Centre national de la recherche scientifique,
bâtiment 505, université Paris-sud, F-91405 Orsay cedex, France
Pulsed photodetachment microscopy and the electron affinity of Iodine
Experimental set-up
qFa
0max 2 azR
23
032
aN
Interfrangedistance
a
z
NR
i3
00max 3
a
zRAiRj
0
2
0
2
41)(
Pulsed laser
New result : electron affinity of 127I
7
6
5 4
3
2
1
8
9
10
11
12
13
1 : Source and simple lens doublet (“Einzellens") 2,5,9,10 : Deflection plates3,6,8 : Simple lenses
4 : Wien filter7 : Deflection 11 : Focalisation quadrupole 12 : Deceleration plates13 : Interaction zone
C
D
F
U
Pumped QCW20 Hz, 515 nm
Ti:SaQCW, 150 µs
Dual polarizationstabilized He-Ne
Sigmameter Q-CW
Lambdameter WSUuncertain. +/- 0.041 m-1
Frequency-doubled Nd:YAG 25 mJ @ 532 nm
Pulsed Ti:Sa~ 10 mJ @ 810 nm
BBO
~ 1 mJ @ 405 nm 15 ns
L. Cabaret and C. Drag, Eur. Phys. J. Appl. Phys. 37 (2006) 65
L. Cabaret, Appl. Phys. B 94 (2009) 71
1S0
2P3/2
F1 = 5/2
F2 = 1F2 = 2F2 = 3
F2 = 4
I [F2]=2 F2 +1
14.097 m-1
6.5575 m-1
2.46 m-1
eA = 2 467 287(3) m-1
Ele
ctro
n C
oun
t
Radius (mm)
2467275
2467280
2467285
2467290
2467295
0 100 200 300 400Laser pulse energy (microJ)
Ele
ctr
on
aff
init
y (
m-1
)Ele
ctro
n a
ffinit
y (
m-1)
Laser pulse energy (µJ)
Quantum parameters :
Wavelength scale
Number of rings
Classical parameters
Radial current density
Principle: Y.N. Demkov et al., JETP Lett. 34 (1981) 403
Photodetachment microscopy: C. Blondel et al., Phys. Rev . Lett. 77 (1996) 3755
Photoionization microscopy: C. Nicole et al., Phys. Rev . Lett. 88 (2002) 133001
Molecular photodetachment microscopy : C. Delsart et al., Phys. Rev . Lett. 89 (2002) 183002
Highest height
Maximum radius
32
0 2mqF
l0 = 0.045 mma = 0.35 mm
R
F = 427 Vm-1
e = 0,926 ± 0,002 cm-1
Rmax
j
14
15
14 : Laser 15 : Column of constant F16 : MCP17 : Phosphor screen18 : CCD
negative
ion
neutral atom
hn
e
eA
18
16
17
Accumulation Barycenter
Photodetachment microscopy
2
'
2
1
21
U
F
C
DhA
Tunable single longitudinal mode.
Long & short time stabilization
Nanosecond pulse
Uncertainty ≈0.8 m-1
Energy ≈ 400mJ
Main properties
1980 1990 2000 2010Year
Ele
ctro
n A
fin
ity
(eV
)
3.05899
3.05904
3.05909
3.05914
3.05919
Experiment
2467275
2467280
2467285
2467290
2467295
0 20 40 60 80 100
Photoelectron average energy (m-1)
Ele
ctro
n afi
nity
(m
-1)
2.7
2.8
2.9
3.0
3.1
3.2
1980 1990 2000 2010
Year
Ele
ctro
n A
fin
ity
Theory
Experiment
Ele
ctro
n A
ffinit
y (
eV
)
Ele
ctron A
ffinity
(eV
)
Ponderomotive effect : electron oscillations in electromagnetic waves.
2
22
P4 m
EqU
R. J. Peláez et al. J. Phys. B. 42 (2009) 125001
eA(127I) = 2 467 286.7 (28) m-1
= 3.059 0453 (36) eV
Ponderomotive effects have been negligible, for two reasons:i) Blue wavelength (~ 405 nm)ii) Low energy ≈ 400µJ
41st EGAS, Gdansk, 8-11 July 2009
Doppler Effect
