Interdisciplinary activities with the MP Orsay Tandem

1. 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.

2. Material modifications :Few days /year • Irradiation of material for studies on nuclear waste conditioning • ( IPN radiochemistry group ) • Irradiation of astrophysical analogue produced in lab • (Orsay University collaboration) - … 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 Atomic beams.

3. Nanodiamant production: (CEA-Ecole Polytech. -IPN – A.Dunlop PRB(2007)) C60 track Elect. Micros. dE/dx (MeV/(mg/cm2)) C60 Graphite film E (MeV) Stable deposited nanodiamant Pressure (GPa) Very High stress is reached with C60 impact. Pressure - temperature phase diagram of carbon 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. Damage and modification of material are governed by stopping power – electronics at high energy - dE/dx for C60 is twice that for U

4. High energy Aun (n<400) Beams dE/dx (MeV/(mg/cm2)) E (KeV) Orion LMIS Source at High Voltage terminal Material modification – Mass spectrometry tool – ( few day / year)

5. Light cluster and molecular carbon beams + 3 m C3H+ C3H2+ 10 m C3+ C3H3+ 1mm 1mm 1mm 0.15 mm CnHm, NCn,.. Cn, Sin,.. Molecular and atomic physic : few weeks / year high velocity atomic collisions t=0 s High velocity ( Vcol >>Ve- ) Atomic collision ( only electrons are concerned) t ~ 0.1 fs Electron-phonon coupling t < 100 ps Fragmentation t < 10 ns

6. Fragmentation spectroscopy : AGAT Multidetector He {Cp} {Cq}+ Pulse shape Analysis on silicon current signal. C/C/C Peak Current C /C 2 C/C C10++He -> {Cp*} C C 3 Mass fragmentation partitions are fully resolved C 2 Energy Energy Inverse kinematics scheme : 4P detection 100% efficient Silicon Chabot et al 2002

7. C3/C2/C 2C2/2C C2/4C C3/C3 C4/2C C3/3C C4/C2 C5/C 3C2 6C C6 2C2/C C2/3C C3/2C C3/C2 C4/C 5C Wi (E) = [Nf ; {Mj, Zj, Sj, Lej, Gj, rj, Fj,pj,Lj, Enj}j=1,Nf ] C5 C3/C2/2C C4/C2/C 2C2/3C C3/2C2 2C3/C C4/3C C3/4C C5/C2 C4/C3 C5/2C 3C2/C C2/5C C6/C C7 7C 0.7 0.07 0.7 (x10) (x10) C5 C7 0.6 0.06 0.6 (M=mass, Z=charge, S=spin, Le= electronic orbital momentum, G= geometry, r= position, F= orientation , p=impulsion, L= kinetic momentum, Envibration energy.) 0.05 0.5 0.5 0.04 0.4 0.4 BR BR 0.03 0.3 0.3 0.02 0.2 0.2 0.01 0.1 0.1 0.00 0.0 0.0 C3/2C2/C C3/C2/3C C4/C2/2C C4/C3/C C5/C2/C 2C2/4C C4/2C2 3C2/2C 2C3/C2 2C3/2C C6/C2 C3/5C C2/6C C5/C3 C6/2C C5/3C C4/4C C7/C 2C4 4C2 C8 8C 0.07 0.7 0.07 0.07 0.06 0.06 0.6 0.06 0.05 0.5 0.05 0.05 0.04 0.04 0.04 0.4 0.03 0.03 0.3 0.03 0.7 (x10) 0.02 0.02 0.02 0.2 C6 0.6 0.01 0.01 0.1 0.01 C8 (x10) 0.0 0.00 0.00 0.00 0.5 0.4 BR 0.3 BR 0.2 0.1 0.0 Statistical behavior of highly excited small neutral carbon clusters Martinet et al PRL04

8. Branching ratio following electronic excitations are required to model the undergoing chemistry. + UV CR DR Application of BR measurements to astrochemistry Effect of Statistical BR for Cn and CnH on Horse head chemistry calculation. Lot of hydrocarbons are observed in Interstellar Medium. Variation in calculation C4H around giant red star IRC 10216 ISO observation Tuna et al JCP08

9. Conclusion - Atomic beams - Massive Cluster beams • Light carbon and molecule beams.  Lot of Nice Interdisciplinary results 