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EPSRC Reference: GR/M08257/01
Title: SHORT PULSE LASER INTERACTIONS WITH POSITIVE IONS AND MOLECULES
Principal Investigator: Newell, Professor WR
Other Investigators:
Researcher Co-Investigators:
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Department: Physics and Astronomy
Organisation: UCL
Scheme: Standard Research (Pre-FEC)
Starts: 01 April 1998 Ends: 30 June 2000 Value (£): 143,863
EPSRC Research Topic Classifications:
Atoms & Ions
EPSRC Industrial Sector Classifications:
No relevance to Underpinning Sectors
Related Grants:
Panel History:  
Summary on Grant Application Form
This is an investigation of the interaction of intense (~1017w/cm2 ) laser radiation (800 nm) with molecules and positive molecular ions by MEDI. Although all natural molecular rotational and most vibrational motion is frozen in a 50 fs pulse the molecule will interest dynamically with the laser field. This produces orbital distortions resulting in molecular stretching to new equilibrium positions (~2 xRo) and induced bending in which a linear (q = 180o) molecule can bend to q = 90o before dissociating. In addition, molecular re-alignments, resulting from the anistropic polarization, produces fragmenting ions along directions orthogonal to the molecular symmetry axis Cn. This research is in a study of these dynamical interactions within high density laser fields directly observing the angular distributions of fragmentation molecular ions and by initially preparing molecules in a distribution of excited vibrational states. We also seek to determine the role of primary single molecular ionization in the laser field by producing independently a beam of molecular positive ions. This will aid the distinction between sequential and non-sequential multi-electron ionization.
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