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Molecular Tunneling Ionization and Molecular Alignment

Molecular Tunneling Ionization and Molecular Alignment. X. M. Tong, Z. X. Zhao and C. D. Lin Physics Department, Kansas State University, Manhattan KS 66506. email: xmtong@phys.ksu.edu http://phys.ksu.edu/~xmtong. Molecular Tunneling Ionization. Motivation:

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Molecular Tunneling Ionization and Molecular Alignment

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  1. Molecular Tunneling Ionization and Molecular Alignment X. M. Tong, Z. X. Zhao and C. D. Lin Physics Department, Kansas State University, Manhattan KS 66506 email: xmtong@phys.ksu.edu http://phys.ksu.edu/~xmtong

  2. Molecular Tunneling Ionization • Motivation: • Ionization; tunneling & multiphoton; • ADK (Ammosov, Delone and Krainov) model; • Experimental observations. • Theoretical Method: • Molecular orbital at asymptotical region; • Tunneling ionization; • How to compare with experiments? • Results and Discussion • D2/Ar, N2/Ar, O2/Xe, CO/Kr • S2/Xe, SO/Xe, NO/Xe • F2/Ar

  3. Atoms or Molecules in an Intense Laser Field Multiphoton Ionization: Tunneling Ionization Keldysh parameter

  4. Ionization of N2 and Ar Ip N2: 15.58 eV Ar: 15.76 eV 30 fs: Guo et al., PRA 58 (1998) R4271. 100 fs : DeWitt et al., PRL 87 (2001) 153001.

  5. Ionization of O2 and Xe Ip O2: 12.36 eV Xe: 12.13 eV Ionization supression Interference Model: Muth-Bohm et al., PRL 85 (2000) 2280. Failed for D2, F2 Effective Charge: Guo, PRL 85 (2000) 2276. 30 fs: Guo et al., PRA 58 (1998) R4271. 200 fs : Talebpour et al., JPB 29 (1996) L677.

  6. W.P. T.I. Atomic Tunneling Ionization

  7. Atomic Tunneling Ionization

  8. Atomic Tunneling Ionization

  9. W.P. T.I. F Molecular Tunneling Ionization

  10. A3 A2 Molecular Tunneling Ionization A1

  11. 3.5x1014 W/cm2 Ionization Rates of H2+ in a Static Field H2+ z F

  12. Ionization Rates of H2 H2 Saenz, PRA 61(2000) 051402. z F

  13. Ratio of Ionization Rates for N2:Ar and O2:Xe

  14. F Tunneling Ionization for Oriented Molecules

  15. X1013 W/cm2 q q Ionization for Oriented N2 Molecules

  16. X1013 W/cm2 q Ionization for Oriented O2 Molecules q F

  17. r z How to Compare with Experiments ?

  18. Ionization Rate, Probability and Signal D2/Ar

  19. D2 Energy Potential Molecular Vibration Effect

  20. N2/Ar Ip N2: 15.58 eV Ar: 15.76 eV 30 fs: Guo et al., PRA 58 (1998) R4271. 100 fs : DeWitt et al., PRL 87 (2001) 153001.

  21. O2/Xe Ip O2: 12.36 eV Xe: 12.13 eV 30 fs: Guo et al., PRA 58 (1998) R4271. 200 fs : Talebpour et al., JPB 29 (1996) L677.

  22. D2/Ar Ip D2: 15.47+0.8 eV Ar: 15.76 eV Expt: Wells et al., PRA 66 (2002) 013409.

  23. CO/Kr Ip CO: 14.01 eV Kr: 14.00 eV Expt: Wells et al., PRA 66 (2002) 013409.

  24. F2/Ar Ip F2: 15.70 eV Ar: 15.76 eV Expt: 100 fs : DeWitt et al., PRL 87 (2001) 153001.

  25. NO/Xe, S2/Xe and SO/Xe Ip NO: 9.26 eV S2: 9.36 eV SO: 10.29 eV Xe: 12.13 eV

  26. NO and Xe Expt: Wells et al., PRA 66 (2002) 013409. Xe Expt: Guo et al., PRA 58 (1998) R4271.

  27. S2 and Xe Expt: Wells et al., PRA 66 (2002) 013409. Xe Expt: Guo et al., PRA 58 (1998) R4271.

  28. SO and Xe Expt: Wells et al., PRA 66 (2002) 013409. Xe Expt: Guo et al., PRA 58 (1998) R4271.

  29. A3 A2 A1 Summary

  30. Summary • Develop a molecular tunneling ionization theory; • Study the diatomic molecular ionization; • Extend to triatomic molecules; • Different suppression mechanisms. The full paper can be downloaded from http://www.phys.ksu.edu/~xmtong/pub.html

  31. q F (2) Molecular Alignment (a) Angular dependent ionization signal; (b) How to Align a molecule.

  32. Molecular Alignment in laser field J. Ortigoso et al., JCP110,3870 Short pulse: revival; Long pulse: No

  33. Molecular Alignment Revival: Initial: Random Kick: Deposit J

  34. q F Molecular Alignment

  35. Molecular Alignment O2: Wjm = 1 (even J) or 0 (odd J) N2: Wjm = 1/3 (even J) or 2/3 (odd J)

  36. Kick or Push ? F Dt Pulse intensity 2x1013 W/cm2

  37. N2: (2x1013 : 8x1013)

  38. Revival O2: (2x1013 : 4x1013)

  39. Summary • Optimized revival can be achieved with a fixed laser intensity; • 10% to 20% enhancement for O2, and • 20% to 60% enhancement for N2; • maximum enhancement when the two field parallel.

  40. Summary

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