An HeI photoelectron spectrum of bromine atoms - The use of SiBr4 as a bromine atom source

A bromine atom beam is produced by microwave discharge of silicon tetrabrom ide, SiBrd(4). A complete and well-resolved HeI photoelectron spectrum of b romine atoms was recorded using a double-chamber UPS Machine-II built speci fically for the detection of transient species. Five peaks corresponding to ionizations from Pr P-2(3/2) to Br+ P-3(2,1,0) D-1(2) and S-1(0) are clear ly observed in the absence of significant contamination and the relative in tensities of these photoelectron signals are close to the statistically exp ected ratios. (C) 1998 Elsevier Science B.V. All rights reserved.