Vibration-rotation inelasticity in He-H₂

Vibration-rotation inelasticity in He-H₂ is studied up to total energy 1.5 eV. This extends the previous lower energy pure rotational studies with the effective potential method. Comparison is made with breathing sphere calculations, and the corresponding vibration-rotation differential and total cross sections are similar. However, it is shown that there are many other nonbreathing sphere type vibration-rotation cross sections of comparable magnitude. The competitive roles of coupling and energetic resonance effects are quite apparent in the cross sections. The differential and total cross sections are examined for general characteristic behavior. An analysis is presented of the energy dependence of the cross sections. Finally, comments on general effective Hamiltonian methods are included.