CALCULATION OF DIFFERENTIAL CROSS SECTION FOR e$^-$-H$_2$O INELASTIC VIBRATIONAL COLLISIONS Osvaldo Moreira, Jiri Stepanek Paul Scherrer Institut (PSI), CH-5232 Villigen PSI, Switzerland The calculation of differential cross section for e$^-$-H$_2$O follows the theory developed by Thompson. For the calculation of the molecular orbitals the following atomic orbitals habe been taken: orbitals $s$, $p$ and $d$ for oxygen and $s$ and $p$ for hydrogen. The T-matrices habe been calculated from the K-matrices and then weighted with the eigenfunctions of the linear harmonic oscillator. The geometry used for the water molecule is 1.8 a$_0$ for the OH bound and 105$^o$ for the angle.