Quantal and semiclassical studies of reactions in strong laser fields: F(2P3/2, 2P1/2)+H2+ℏω (0.117, 0.469, 1.17 eV)

The effects of three photons, namely the CO2 photon (hν=0.117 eV), the HF photon (hν=0.469 eV), and the Nd:glass photon (hν=1.17 eV), on the reactive [F(2P3/2), F(2P1/2)]+H2 systems were studied. Results due to exact quantal, approximate quantal (curve crossing model), and semiclassical (trajectory surface hopping model) treatments are presented for the collinear arrangement. It was found that the existence of field intensities of 0.1–2.5 TW/cm2 hardly affect the reactive process for the system F(2P3/2)+H2. In the interaction of F(2P1/2) and H2 which is, for all practical purposes, elastic in the field-free case, the field-induced electronic inelastic (the spin conversion process) and electronic reactive transition probabilities are not large. For an intensity of 0.1 TW the largest probability encountered is 20%. In comparing the quantal and the semiclassical treatments, it was found that except for one case where a quantitative fit was obtained in all (five) other cases the agreement is at most qualitative. In general, the semiclassical results are lower than the quantal ones.