ORGANIC CHEMISTRY Chapter g o In an electron impact mass spectrometer molecules in gaseous state under low pressure are bombarded with a beam of high energy electrons o One of the things this bombardment can do is dislodge one of the electrons of the molecule and produce a positively charged ion called the molecular ion aniston fragmentation 十 radical cati an adical cati on 2e molecule moleculat fragment Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 9 In an electron impact mass spectrometer molecules in gaseous state under low pressure are bombarded with a beam of high energy electrons. One of the things this bombardment can do is dislodge one of the electrons of the molecule and produce a positively charged ion called the molecular ion