Conical surface guide

Commonly, it is asserted that upward transitions from the lower adiabat to the upper one should be less likely than downward transitions because of the funneling property of the intersection [144,145]. This is clearly seen in the usual model conical intersection—as seen, for example, in Fig. 1 of Ref. 146, where there is (a) a well, or funnel, in the upper adiabat which guides the wavepacket to the intersection and (b) a peak on the lower adiabat which tends to guide the wavepacket away from the intersection. The potential energy surfaces shown in Fig. 7 differ from this canonical picture, and in particular it is not at all clear that the wavepacket on the lower adiabatic state will be funneled away from the intersection. For the conditions chosen in our calculations, we... 

A second method is the iso-conic partitioning method (Nan Wang 2008) that resembles the isophote method, but it generates isolines, called equi-space contour lines, on a surface that refer to small variation of the machine rotary axes. Figure 17 shows curves that are equidistant in regard of machine rotations. Similar, these isolines are not tool path curves, but some of them can be used as guide ways for tool paths. 

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