Variation of potential surface inclination and bound state creation induced by laser phase along the reaction path in ion-molecule reactions: application to Na++CH4

Laser ion-molecule reaction interaction through both polarizability and dipole moment contribution leads to intersection in potential energy surface along the reaction path, polarizability is maximum at (s=4.5 a.u.) and dipole changes at (s=1 a.u.) defining a virtual transition state. We will show here by using gauge representation for wave length λ=20.6μm, Intensity I=5×10 W/cm till I=5×10 W/cm, that the laser induced potential energy surface can decrease in height along the reaction path with possibility of creating bound states in the virtual transition state. We illustrate such effects for the Na H + CH3 +  Na + CH4 reaction which takes the form of inverted Morse (without a barrier) using ab-initio methods for calculating the reaction path, electric properties of the ion-molecule reaction. 188 Hassan Talaat, El-Wallid S. Sedik and M. Tag El-Din Kamal