I. De and L. One-cbs-faisant-varier-le-champ-magnétique, soit en tournant l'analyseur, l'intensité du lobe dominant décro?décro??t tandis que celle du petit lobe cro??tcro??t, jusqu'` a ce que ?/2 ? ? dip = ?/4. Les deux paires de lobes ont alors même intensité, et une symétrie d'ordre quatre est restaurée. Audeì a de cette valeur, leurs rôles sontéchangés sontéchangés. Le grand axe du cône subit alors une rotation de 90 ? . Dans le canal lin ? lin (? = ?/2), cela se produit pour B = 0 (figure 7.1, o` u le cône a une symétrie d'ordre 4) Dans ce modèle, la relation entre

C. and .. Sonde, onde et la direction de propagation de l'´ energie, et les seconds le libre parcours moyen. Si ils sont indépendants, on peut rendre leur produit aussi petit qu'on veut

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