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Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Collisions inside subfemtosecond laser pulses L. Kocbach 1, L.B. Madsen 2 and J.P.

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Presentation on theme: "Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Collisions inside subfemtosecond laser pulses L. Kocbach 1, L.B. Madsen 2 and J.P."— Presentation transcript:

1 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Collisions inside subfemtosecond laser pulses L. Kocbach 1, L.B. Madsen 2 and J.P. Hansen 1 1 University of Bergen, Norway 2 University of Århus, Denmark

2 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 The Nobel Prize in Chemistry 1999 The Royal Swedish Academy of Sciences has awarded the 1999 Nobel Prize in Chemistry to Professor Ahmed H. Zewail for his studies of transition states of chemical reactions by femtosecond spectroscopy.

3 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 The Nobel Prize in Chemistry 1999 The Royal Swedish Academy of Sciences has awarded the 1999 Nobel Prize in Chemistry to Professor Ahmed H. Zewail for his studies of transition states of chemical reactions by femtosecond spectroscopy. Zewail's technique uses what can be thought of as the world's fastest camera. The "shutter speed" of such a camera must be extremely high since molecules are very small (about 10 -9 m) and move extremely rapidly (1000 m/s). To obtain a sharp "image" of the molecules in the course of a chemical reaction requires a femtosecond (10 -15 s) shutter speed.

4 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

5 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

6 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Few Cycles Light Pulses

7 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

8 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

9 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Collision and laser pulse combined

10 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

11 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

12 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

13 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

14 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Collision and laser pulse combined

15 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Quantal formulation Schrödinger Equation Combination of projectile-electron and laser-electron interactions Dipole Approximation

16 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Amplitude Equations

17 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Collision and laser pulse combined

18 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

19 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Collisions inside subfemtoseconds laser pulses

20 Prague, November 4, 2002

21 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

22 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

23 Collisions inside subfemtoseconds laser pulses Collisions leading to ionization. One electron is ejected as a result of the collision, the laser pulse, or their combination Simulated in CTMC CTMC: Classical Trajectory Monte Carlo model Newton equations are solved for hundreds of thousands sets of initial conditions

24 Collisions inside subfemtoseconds laser pulses Classical (CTMC) simulations of ionization in collisions inside a short laser pulse Laser only Collision only Combination of both

25 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Laser pulse only

26 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Collision only

27 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Combination of both laser pulse and collision

28 Collisions inside subfemtoseconds laser pulses Classical (CTMC) simulations of ionization Laser only Collision only Combination of both

29 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 Can this be detected?

30 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002 COLTRIMS COLd Target Recoil Ion Momentum Spectroscopy TES Translational Energy gain Spectroscopy PES Photon Emission spectroscopy

31 Collisions inside subfemtoseconds laser pulses COLTRIMS COLd Target Recoil Ion Momentum Spectroscopy

32 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

33 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

34 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

35 Collisions inside subfemtoseconds laser pulsesPrague, November 4, 2002

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