TRIATOMIC MOLECULAR STRUCTURE STUDIED BY ION-MOMENTUM IMAGING AND MONTE-CARLO SIMULATION. W A Bryan*, A El-Zein*, J H Sanderson*, W R Newell*, A J Langley# and P F Taday#. * Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK # Central Laser Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK Using a 55fs Ti: Sapphire laser focussed to generate field intensities of 3x10^16 Wcm^(-2), the Coulomb explosion of carbon dioxide has been imaged using a time-of-flight mass spectrometer. A Monte-Carlo technique is employed to reproduce the experimental results and the initial geometry and orientation of the molecule is inferred.