  Measurements on the strong-field ionization of carbonyl sulfide molecules by
short, intense, 2~\um wavelength laser pulses are presented from experiments
where angle-resolved photoelectron distributions were recorded with a
high-energy velocity map imaging spectrometer, designed to reach a maximum
kinetic energy of 500~eV. The laser-field-free elastic-scattering cross section
of carbonyl sulfide was extracted from the measurements and is found in good
agreement with previous experiments, performed using conventional electron
diffraction. By comparing our measurements to the results of calculations,
based on the quantitative rescattering theory (QRS), the bond lengths and
molecular geometry were extracted from the experimental differential cross
sections to a precision better than $\pm5$~pm and in agreement with the known
values.
