HCO ~+ dissociation in a strong laser field: An ab initio classical trajectory study

摘要

We have investigated the photodissociation of HCO ~+ in a strong field with a wavelength of 10 lm using ab initio molecular dynamics. Classical trajectories were calculated at three field intensities. At 2.9 × 10 ~(14) W/cm ~2 and phase φ = 0, protons have two distinct dissociation times, mainly due to the reorientation of HCO + relative to the field direction prior to dissociation. The kinetic energy distribution at this intensity agrees with Wardlaw's wagging tail model, suggesting that dissociation occurs through barriersuppression. At 1.7 × 10 ~(14) and 8.8 × 10 ~(13) W/cm ~2, barrier suppression is incomplete and the maximum kinetic energy is less than predicted by the wagging tail model.