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Controlling vibrational wave packet motion with intense modulated laser fields.

Hiromichi Niikura1, P B Corkum, D M Villeneuve

  • 1National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6.

Physical Review Letters
|June 6, 2003
PubMed
Summary

Researchers controlled molecular dissociation by modulating intense laser fields. This Stark shift guidance achieved 90% control over bond softening in molecules like H2 and D2.

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Area of Science:

  • Physical Chemistry
  • Quantum Dynamics
  • Laser Physics

Background:

  • Intense laser fields significantly alter molecular potential energy surfaces via Stark shifts.
  • Vibrational wave packets in molecules can be manipulated by time-dependent laser fields.

Purpose of the Study:

  • To investigate the control of molecular dissociation using modulated intense laser fields.
  • To demonstrate the guiding of vibrational wave packets through time-varying Stark shifts.

Main Methods:

  • Generating a 70 fs laser pulse modulated on a ~10 fs timescale using an optical parametric amplifier.
  • Initiating vibrational wave packets in H2 or D2 via ionization, forming H2(+) or D2(+) ions.
  • Applying modulated laser fields during wave packet motion to induce bond softening and dissociation.

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Main Results:

  • Achieved controlled molecular dissociation by tuning laser intensity at the wave packet's outer turning point.
  • Demonstrated that high laser intensity at the turning point leads to dissociation via bond softening.
  • Observed minimal dissociation when the laser field was weak at the critical time.
  • Attained a 90% contrast in dissociation yield by altering the laser modulation period.

Conclusions:

  • Modulated intense laser fields can precisely guide molecular vibrational wave packets.
  • Stark shift manipulation offers a pathway to control chemical reactions, specifically molecular dissociation.
  • This technique provides a high degree of control over bond softening dynamics in molecules.