OBSERVATION OF NEGATIVE-ION RESONANCES IN ELECTRON-IMPACT CORE EXCITATION OF LITHIUM A.A. Borovik, V.N. Krasilinec and O.I. Zatsarinny Institute of Electron Physics, Ukrainian Academy of Sciences, 21 Universitetska str., Uzhgorod 294016, Ukraine The ejected-electron excitation functions for the lowest 1s2snl autoionizing states in lithium have been measured at the magic angle of 54.7 and compared with R-matrix calculations of the total excitation cross-sections of these levels. Both kind of data reveal the strong resonance features at 56.8; 58.2 and 59.5+-0.1 eV which are assigned as core-excited negative ion resonances.