Angular electron distribution in photoionization of spatially oriented linear molecules for different geometries of the experiment

Starting from the general expression for the angular distribution of electr ons produced through photoionization of spatially oriented molecules, simpl er formulas for photoionization of linear molecules with an inversion cente r found in the Sigma state, accompanied by the production of molecular ions in Sigma and Pi states, are obtained. For different geometric arrangements of the vectors determining the angular distribution, simple formulas are d erived and their comparative analysis is made. It is shown that one can det ermine for different conditions of the experimental measurement of the angu lar dependences of ejected electrons the values of matrix elements and phas e differences and separate the processes responsible for the production of ions in states with different symmetries. (C) 2000 MAIK "Nauka/Interperiodi ca".