AbstractsThe CH, molecule has been investigated ab initio, for four different distances RCAH and one distortion of a triangle HCH about the equilibrium condition, taking all 10 electrons into account, using the Allgemeines P~OgTU~mSyStem/SCF-MO-LC(LCGO) Methode. The equilibrium distance RC-H was estimated to 2.053 a.u., the minimum of the total energy to -40.06 a.u., the heat of formation to 17.0 eV and the ionization energy to 14.8 eV. For the breathing force constant and the force constant of the twisting vibration a w1 of 3139 cm-l and a w2 of 1865 cm-l were found.On prksente un calcul ab initio de la moltcule CH, , bast sur Allgemeines Programm-