Fig. 7.12 Spiralling diatropic trajectories of current density above the plane containing the nuclei
of ethylene for a field perpendicularly pointing outward. The mirror image of this pattern is
observed below the plane of the nuclei. The isolated ð3; Æ1Þ stagnation points are represented with
the colour convention of Fig. 7.11
Fig. 7.13 Asymptotic lines of current density on the plane containing the nuclei of ethylene. The
magnetic field, applied at right angles to the plot plane, points outwards. Blue points denote
ð3; Æ1Þ saddle-nodes, green (red) spots mark regions of diamagnetic (paramagnetic) spiral flow
about ð3; Æ1Þ foci
186
P. Lazzeretti
of ethylene for a field perpendicularly pointing outward. The mirror image of this pattern is
observed below the plane of the nuclei. The isolated ð3; Æ1Þ stagnation points are represented with
the colour convention of Fig. 7.11
Fig. 7.13 Asymptotic lines of current density on the plane containing the nuclei of ethylene. The
magnetic field, applied at right angles to the plot plane, points outwards. Blue points denote
ð3; Æ1Þ saddle-nodes, green (red) spots mark regions of diamagnetic (paramagnetic) spiral flow
about ð3; Æ1Þ foci
186
P. Lazzeretti