Three-photon ionization of He(1s2p 3 P o ) and He(1s2s 3 S e )
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1 Matthieu Génévriez Institute of Condensed Matter and Nanosciences Université Catholique de Louvain Three-photon ionization of He(1s2p 3 P o ) and He(1s2s 3 S e ) EGAS 46, Lille
2 Multiphoton ionization : ground state Rydberg states From the ground state : Ponderomotive shift 3 hω 0 Expected ionization spectrum : Ground state intensity time hω 0 hω M. Génévriez (UCLouvain) EGAS46 2 / 19
3 Multiphoton ionization : excited state From the ground state : Ponderomotive shift Rydberg states From the excited state : Dynamic Stark mixing Expected ionization spectrum :? intensity time M. Génévriez (UCLouvain) EGAS46 3 / 19
4 A simple case : the 1s2s 3 S state 0.7 6mJ linear sns 1snd M. Génévriez (UCLouvain) EGAS46 4 / 19
5 A simple case : the 1s2s 3 S state l = 0 l = 1 l = 2 l = 3 Characteristics : (2+1) REMPI 1sns Γnsɛp Γndɛp Γndɛf 1snd He + (1s) nm V (2) 2sns V (2) 2snd I W/cm 2 He (1s2s 3 S) 6mJ linear snd 1sns M. Génévriez (UCLouvain) EGAS46 5 / 19
6 A simple case : the 1s2s 3 S state l = 0 l = 1 l = 2 l = 3 Characteristics : (2+1) REMPI 1sns Γndɛf 1snd He + (1s) nm V (2) 2snd I W/cm 2 He (1s2s 3 S) 0.7 6mJ circular snd M. Génévriez (UCLouvain) EGAS46 6 / 19
7 A simple case : the 1s2s 3 S state l = 0 l = 1 l = 2 l = 3 Characteristics : (2+1) REMPI 1sns Γndɛf 1snd He + (1s) nm V (2) 2snd I W/cm 2 He (1s2s 3 S) 0.7 6mJ circular snd M. Génévriez (UCLouvain) EGAS46 7 / 19
8 A simple case : the 1s2s 3 S state Rydberg states The intensity at which resonance occurs influences : Interaction time Number of atoms 0.5 1snd intensity time M. Génévriez (UCLouvain) EGAS46 8 / 19
9 A simple case : the 1s2s 3 S state 1.1 6mJ linear 6mJ circular mJ linear 6mJ circular sns 1snd M. Génévriez (UCLouvain) EGAS46 9 / 19
10 Increased complexity : the 1s2p 3 P o state M. Génévriez (UCLouvain) EGAS46 10 / 19
11 UCLouvain Experiment He production Double charge exchange between He + and cesium vapour He (1s2s2p 4 P o ) MCP He + Cs He + He V He 0 z y Laser He M. Génévriez (UCLouvain) EGAS46 11 / 19
12 UCLouvain Experiment Photo-detachment and ionization Pulsed dye laser pumped by the 2nd/3rd harmonics of Nd :YAG laser He + γ He 0 + e He 0 + 3γ He + + e MCP He + Cs He + He V He 0 z y Laser He M. Génévriez (UCLouvain) EGAS46 11 / 19
13 UCLouvain Experiment He + and He detection Energy selection + temporal gating Typical signal-to-noise ratio : 50 MCP He + Cs He + He V He 0 z y Laser He M. Génévriez (UCLouvain) EGAS46 11 / 19
14 Effective Hamiltonian method Energies P P-space states coupled explicitly P P P P P E 1,ψ 1 E 1,ψ 0 1 P P Additional M.E. s H H eff H H eff WH eff = HW Matrix elements : 1. 2-electron Coulomb DVR basis + Quantum Defect Theory 2. Comparison with ab initio R-Matrix Floquet calculations Durand, PRA 28 (1983) Baker, PRA 30 (1984) M. Génévriez (UCLouvain) EGAS46 12 / 19
15 Effective Hamiltonian method Energies P P-space states coupled explicitly P P P P P E 1,ψ 1 E 1,ψ 0 1 P P Additional M.E. s H H eff H H eff WH eff = HW Matrix elements : 1. 2-electron Coulomb DVR basis + Quantum Defect Theory 2. Comparison with ab initio R-Matrix Floquet calculations Durand, PRA 28 (1983) Baker, PRA 30 (1984) M. Génévriez (UCLouvain) EGAS46 12 / 19
16 Effective Hamiltonian method Energies P P-space states coupled explicitly P P P P P E 1,ψ 1 E 1,ψ 0 1 P P Additional M.E. s H H eff H H eff WH eff = HW Model : 1. Time-propagation of H eff for many intensities 2. Reconstruction of the experimental averaging and integration Durand, PRA 28 (1983) Baker, PRA 30 (1984) M. Génévriez (UCLouvain) EGAS46 13 / 19
17 1s2p 3 P o : linear polarization l = 0 l = 1 l = 2 l = 3 l = 4 Characteristics : (2+1) REMPI M L = ± 1 (0) Γnpɛs 1snp Γnpɛd Γnfɛd Γnfɛg 1snf He + (1s (1+1+1) REMPI M L = nm I W/cm 2 He (1s3s 3 S e ) V3snp V2p3s V (2) 2pnp V (2) 2pnf He (1s2p 3 P o ) 0.4 1s2p-1s3s resonance s9p 1s9f M. Génévriez (UCLouvain) EGAS46 14 / 19
18 1s2p 3 P o : linear polarization l = 0 l = 1 l = 2 l = 3 l = 4 Characteristics : (2+1) REMPI M L = ± 1 (0) Γnpɛs 1snp Γnpɛd Γnfɛd Γnfɛg 1snf He + (1s (1+1+1) REMPI M L = nm I W/cm 2 He (1s3s 3 S e ) V3snp V2p3s V (2) 2pnp V (2) 2pnf He (1s2p 3 P o ) 0.4 1s2p-1s3s resonance s9p 1s9f M. Génévriez (UCLouvain) EGAS46 14 / 19
19 1s2p 3 P o : across the 1s2p-1s3s resonance intensity time intensity time Eigenenergies RESONANCE ion. yield 1s3s 1s2p Eigenenergies RESONANCE ion. yield 1s12f 1s12p 1s2p 1s3s 1s10f 1s10p 0.4 1s2p-1s3s resonance s9p 1s9f M. Génévriez (UCLouvain) EGAS46 15 / 19
20 1s2p 3 P o : linear polarization 1.2 (2+1) REMPI, ML = ±1 (1+1+1) REMPI, ML = s2p-1s3s resonance s9p 1s9f M. Génévriez (UCLouvain) EGAS46 16 / 19
21 1s2p 3 P o : circular polarization 1.2 (2+1) REMPI, ML = 0, 1 (1+1+1) REMPI, ML = s9p 1s9f 1s2p-1s3s resonance M. Génévriez (UCLouvain) EGAS46 17 / 19
22 Conclusion In-depth study of multiphoton ionization from excited states of Helium Particular features due to intermediate resonances From (2+1) REMPI to (1+1+1) REMPI Influence of M L, polarization M. Génévriez (UCLouvain) EGAS46 18 / 19
23 Acknowledgements X. Urbain, A. O Connor, M. Terao-Dunseath, K.M. Dunseath More information : M. Génévriez, X. Urbain, M. Brouri, A.P. O Connor, K.M. Dunseath, M. Terao-Dunseath, Phys. Rev. A 89, (2014) M. Génévriez (UCLouvain) EGAS46 19 / 19
24 Acknowledgements Thank you for your attention! More information : M. Génévriez, X. Urbain, M. Brouri, A.P. O Connor, K.M. Dunseath, M. Terao-Dunseath, Phys. Rev. A 89, (2014) M. Génévriez (UCLouvain) EGAS46 19 / 19
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