Controlling Matter with Light

1. Controlling Matter with Light Robert J. Gordon University of Illinois at Chicago DUV-FEL Seminar January 6, 2004 NSF, DOE, PRF, UIC/CRB, Motorola

2. Outline • Dissociative Ionization • Molecular Optics • Coherent Control • Material Processing

3. Photodissociation of C6H5I at 266 nm J. Phys. Chem. A 105, 2001 (2001)

4. Mechanism at 266 nm Outer Feature Inner Feature

5. Photodissociation of C6H5I at 532 nm J. Phys. Chem. A 105, 2001 (2001)

6. Photodissociation of I2 532 nm 559 nm 564 nm 575 nm PRL 86, 2241 (2001)

7. Kinetic Energy of Iodine 556.0 nm 574.7 nm

8. Dissociative Ionization

9. Dissociative Ionization of H2 JCP 104, 8449 (1996) J. Phys. B 30, 2319 (1997)

10. Possible FEL Experiments • 90 – 100 nm single photon excitation • Pump-probe photoelectron-photoion coincidence (Hayden) • Photoelectron angular distributions of aligned molecules

11. Manipulating Molecules With Light Alignment Orientation Deflection Focusing Trapping

12. Interaction with a Focused Laser Beam Intensity Potential Force

13. Dipole Interaction Gaussian electric field Dipole potential r  deflection & focusing   alignment & orientation

14. Dipole Force Gaussian field Induced potential U0(K) = 15 α//(3) I(TW/cm2)

15. Deflecting Molecules in Different MJ States E Li2 |M| = J M = 0 Seideman, 107, 10420 (1997)

16. Stark Shift

17. Apparatus Molec. Beam 1064 nm 358 nm tof ms MCP CCD

18. CS2 Deflection

19. YanDu Yan Du

20. Joyce Joyce Willig

21. Sujatha Unny

22. Dynamic Polarizability e- a/n6103 a/n6 a-wl-2 wl n3 Seideman, JCP 111, 4397 (1999).

23. Molecular Mirror Classical forced oscillator: Sign reversal at high frequency

24. Possible FEL Experiments • Deflect molecules in high Rydberg states • Use a near-resonant deflection field

25. Passive Control of Chemical Reactions F. Crim

26. Active Control of Chemical Reactions

27. Interference Between Competing Paths P = P1 + P2 + P12 P = |f1 + f2|2 = |f1 |2 + |f2|2 + f1f2* + f1*f2

28. Coherent Phase Control of Bound-Bound Transitions Shapiro, Hepburn, and Brumer, Chem. Phys. Lett. 149, 451 (1988).

29. Apparatus

30. Langchi Zhu

31. Phase Tuning

32. Controlling Branching Ratios S = A S = B

33. JPC

34. The Phase Lag

35. The Channel Phase The Phase Lag

36. Molecular Phase

37. Resonance Phase

38. Phase Lag Spectrum of HI

39. Coupling Schemes

40. CH2=CHCl + 3, 31 Cl H HCl H2

41. Excimer Laser Dye Laser 308 nm 404.6 nm TOF/MS Hg Tripling Cell w1 w3=3w1 532 nm Nd:YAG Laser Polarizer /2 Plate VCl Experimental Setup

42. Vishal Barge

43. Possible FEL Experiment • Coherent phase control of the ionization and dissociation of the Q1 states of H2

44. Wave Packet Control

45. Possible FEL Experiment • Pump-probe study of time-resolved intersystem crossing in pyrazine • Wave packet control of ISC

46. Pyrazine Intersystem Crossing Ion S1 T1 S0 C4N2H4

47. Photoelectron Spectrum of Pyrazine JCP 95, 2237 (1991)

48. Material Processing • Biomedical applications • Microfluidics • Nano-fabrication

49. Machining Collagen Scaffolds Micro-grooves Mesenchymal Stem Cells

50. Biocompatibility of Collagen Scaffold