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Scope 1. Ionization of molecules - ( MO-ADK theory)

Scope 1. Ionization of molecules - ( MO-ADK theory) Alignment dependence – imaging MO’s (KSU data) ( Experiments : double ionization; high-harmonic generation) “Molecular clock” : Time is read from the kinetic energy release of the fragments with sub-fs accuracy

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Scope 1. Ionization of molecules - ( MO-ADK theory)

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  1. Scope • 1. Ionization of molecules - ( MO-ADK theory) • Alignment dependence – imaging MO’s (KSU data) • (Experiments: double ionization; high-harmonic generation) • “Molecular clock”:Time is read from the kinetic energy release of the fragments with sub-fs accuracy • Attosecond XUV + IR laser physics • how to extract lifetime of autoionizing states • Stark effect of laser-assisted photoexcitations • Probing electron dynamics in the time domain • 3. Summary

  2. APT-attosecond pulse train issues 130 as from the plateau region– the harmonics must be phase locked two sources of asynchronism: 1.short and long paths, thus two bursts– select short by phase matching condition by focusing before the gas jet and a diaphram after 2.different harmonics, due to different recombination times, linear chirp, limits the as pulse durations to about 100as, need chirp compensation Relative phases measured by two-photon, two color ionizations—sideband analysis--RABITT other works– trying to relate the harmonics to electron dynamics HHG facts: plateau region has positive chirp for the short trajectory phase locked in the cutoff region

  3. z: off the focus presented by the Saclay group see Mairesse et al PRL 93, 163901(04); also Science 302, 1540 (03)

  4. The Milano group also made such studies using short pulses with CEP stabilized

  5. not cep sensitive from simulation, PRL92,113904(04)

  6. apt with 170as at Lund --simulation

  7. From RABITT amplitude shaping phase shaping APT pulses

  8. APT+IR good HHG sharp harmonics selecting the time of ionization by apt schaffer et al PRL92, 023003(04) preliminary data from U. Keller’s group confirm the HHG enhancement Lund’s group measured the ATI enhancement to higher electron energies

  9. HHG as light sources • Crete’ group, use 7th and 13th harmonics for cross correlation experiments

  10. Attosecond electron bursts for imaging–”industry?” • Corkum- • Paulus– use the phase information in the tunneling electrons for interference? • M. Lezius- • Ivanov– theory for imaging by electrons (quite complicated, but not impossible) • Villeneuve– imaging thru HHG (N2 Nature04) • Kietzer-ALLE need to know e-wave packet better.

  11. Krausz’s recent work • tried IR-pump/XUV probe– signal too weak • XUV pump/IR probe look at the time of shakeup electrons, rise time is about 4fs

  12. The COLTRIMS people • Doerner- e-e spectra, sequential, nonsequential, also circularly polarized, laser lab soon • Moshammer– double and multiple ionization cold recoil ions • Helm- negative ions, atoms All good talks– theory done by experimentalists mostly, S-matrix theory does not really work

  13. HHG of molecules • Marangnos+Italy group • alignment dependence, short and long pulses; difference in H2 and D2

  14. Activities-- Colloquium at Univ. of Electrocommunications Seminar at RIKEN 1st talk at the conference (more mixed audience) covered: alignment-depn ionization rates and imaging of the electron cloud molecular cloud laser-assisted autoionization

  15. Intense XUV and soft X-ray source Soft X-ray • Above-threshold ionization (ATI) of He • Sekikawa et al., Nature 432, 605 (2004) • h = 27.9 eV • ATI & Two-photon double ionization (TPDI) of He • Hasegawa et al., Phys. Rev. A, in press; Nabekawa et al., Phys. Rev. Lett., in press • h = 41.8 eV 0.33 J @  = 29.6 nm (Ti:Sapphire H27) focused to an area of 10mm2 by a mirror Assuming the pulse duration < 30 fs XUV 1014 W/cm2 Soft X-ray Mashiko et al., Opt. Lett. 29, 1927 (2004)

  16. High-order harmonic generation (HHG) • RIKEN, Laser Technology Laboratory (K. Midorikawa) • 25 nJ @  = 13.5 nm (Ti:S H59) • 0.33 J @  = 29.6 nm (Ti:S H27) • 1 J @  = 54 nm (Ti:S H15) • 4.7 J @ = 62.3 nm (Ti:S H13) • 7 J @ = 72.7 nm (Ti:S H11) • CEA-Saclay, DSM/DRECAM/SPAM (P. Salieres) • 1.9 J @  = 53.3 nm (Ti:S H15) • University of Tokyo, ISSP (S. Watanabe) • 1.2 J @  = 49.7 nm (KrF Excimer H5) Takahashi et al. Phys. Rev. A 66, 021802(2002) Opt. Lett. 27, 1920(2002) JOSA B 20, 158 (2003) Appl. Phys. Lett. 84, 4 (2004) Hergott et al. Phys. Rev. A 66, 021801 (2002) Yoshitomi et al. Opt, Lett. 27, 2170 (2002)

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