الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
mass spectrometer of the type Atles Ci, is uses in combination with electren impact on scurce to investicate the aass spectra of acetic acid ane ortno, Kete-and Para- acetyl anisole, The data obtained present: in the fora of tonization efficiency curves which are treated electron Energy polution Difference reennique. The fragmentation mecnanism of eeetic acte and acetyl anisole isoners at low enercy electron impact his seen Studie ty a Modifies Neglect of Diatosie Overlap (HNDO) notecuier orbital method, Thecretteal app ance enersy values obtained by are conperee with experinentai ones obtained by electron impact technique for the molecules, aolecuier ions and ost intense fragnent ions. The computer program of NOD used in the caleulae tons.