Title: Electron Attachment to 1,4-C6F4BrX(X=F,Cl,Br) Authors: Seiko NAKAGAWA and Toshinari SHIMOKAWA Affiliations: Tokyo Metropolitan Industrial Technology Research Institute Summary: We have studied anions produced from electron attachment to 1,4-C6F4BrX(X =F,Cl,Br) and its temperature dependence using with negative chemical ionization mass spectrometry. For all molecules, M-(M =parent molecule), (M-Br)-, and Br- were produced. Temperature dependence of the relative ratio, (M-Br)-/Br- can lead relative trend of electron affinity of (M-Br) radical and it is correlated with atomic charge distribution of (M-Br)- calculated with Hartree-Fock method.