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Interdisciplinary activities with the MP Orsay Tandem
Marin CHABOT IPN Orsay France
- Atomic Beams
- High Energy Massive Cluster Beams
- Light Carbon Cluster and Molecular Beams.
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Atomic beams.
Electronic test for spatial device : Few weeks / years - business activity – )
Spatial materials are irradiated by Swift Heavy Ions Spatial Industry needs beam test process
to prove radiation hardness
- Irradiation of material for studies on nuclear waste conditioning( IPN radiochemistry group )
- Irradiation of astrophysical analogue produced in lab (Orsay University collaboration)
Material modifications : Few days /year
- …
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High Energy C60 beams
material modification : 5-10 weeks / year
Many experiments have been performed since 1993 and the world’s first production of high energy C60 beams at the IPN. Nanodiamant production:
(CEA-Ecole Polytech. -IPN – A.Dunlop PRB(2007))
Graphite film
Very High stress is reached with C60 impact.
Elect. Micros.
Stable deposited nanodiamant
C60 track
Pre
ssur
e (G
Pa)
Pressure - temperature phase diagram of carbon
Damage and modification of material are governed by stopping power – electronics at high energy -
dE
/dx
(MeV
/(m
g/cm
2))
E (MeV)
C60
dE/dx for C60 is twice that for U
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High energy Aun (n<400) Beamsd
E/d
x (M
eV/(
mg/
cm2))
E (KeV)
Material modification – Mass spectrometry tool – ( few day / year)
Orion LMIS Source at High Voltage terminal
10 100 1000
0,1
1
10
CN-
(M-H)-
(M2-H)-
AuCN2
-
Re
lati
ve
Yie
ld
Energy (qkeV)
Au100q
q+
AuCN2
-
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Light cluster and molecular carbon beams
high velocity atomic collisions
10 m 3 m
1mm 1mm 1mm 0.15 mm
C3+
C3H+C3H2
+
C3H3+
+t=0 s
t ~ 0.1 fs
t < 100 ps
t < 10 ns
Atomic collision ( only electrons are concerned)
Electron-phonon coupling
Fragmentation
Molecular and atomic physic : few weeks / year
High velocity ( Vcol >>Ve- )
Cn, Sin,..
CnHm, NCn,..
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Fragmentation spectroscopy : AGAT Multidetector
He
{Cp}
{Cq}+
Inverse kinematics scheme : 4 detection 100% efficient
Silicon
Energy
C10++He -> {Cp*}
Mass fragmentation partitions are fully resolved
C3
C/C
C/C/C
C2/C
C
C2
Pe
ak
Cu
rre
nt
Energy
Pulse shape Analysis on silicon current signal.
Chabot et al 2002
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C5
C5 C4/C
C3/C
2
C3/2
C
2C2/
C
C2/3
C
5C0.00.10.20.30.40.50.60.7 (x10)
BR
0.000.010.020.030.040.050.060.07
BR
C8
C8 C7/C
C6/C
2C5
/C3
2C4
C6/2
CC5
/C2/
CC4
/C3/
CC4
/2C2
2C3/
C2C5
/3C
C4/C
2/2C
2C3/
2CC3
/2C2
/C4C
2C4
/4C
C3/C
2/3C
3C2/
2CC3
/5C
2C2/
4CC2
/6C
8C
(x10)
0.00.10.20.30.40.50.60.7
0.000.010.020.030.040.050.060.07
C6
C6 C5/C
C4/C
2C3
/C3
C4/2
CC3
/C2/
C3C
2C3
/3C
2C2/
2CC2
/4C
6C
0.00.10.20.30.40.50.60.7 (x10)
BR
0.000.010.020.030.040.050.060.07
C7
C7 C6/C
C5/C
2C4
/C3
C5/2
CC4
/C2/
C2C
3/C
C3/2
C2C4
/3C
C3/C
2/2C
3C2/
CC3
/4C
2C2/
3CC2
/5C
7C
0.00.10.20.30.40.50.60.7 (x10)
BR
0.000.010.020.030.040.050.060.07
Statistical behavior of highly excited small neutral carbon clusters
i (E) = [Nf ; {Mj, Zj, Sj, Lej, Gj, rj, j, pj,Lj, Ej}j=1,Nf ]
(M=mass, Z=charge, S=spin, Le= electronic orbital momentum, G= geometry, r= position, orientation , p=impulsion, L= kinetic momentum, Evibration energy.)
Martinet et al PRL04
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Application of BR measurements to astrochemistry
Lot of hydrocarbons are observed in Interstellar Medium.
Branching ratio following electronic excitations are required to model the undergoing chemistry.
DR + UV CR
C4H around giant red star IRC 10216ISO observation
Effect of Statistical BR for Cn and CnH onHorse head chemistry calculation.
Tuna et al JCP08
Var
iatio
n in
cal
cula
tion
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Conclusion
- Atomic beams
- Massive Cluster beams
-Light carbon and molecule beams.
Lot of Nice Interdisciplinary results