L. Nair et al., ANGLE-RESOLVED DIET OF NEGATIVE-IONS FROM HALOGENATED MOLECULES ON RU(0001), Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 101(1-2), 1995, pp. 79-83
We present data on the electron stimulated desorption(ESD) of negative
ions from PF3 and CCl4 adsorbed on Ru(0001) at 100 K. We use a two-di
mensional digital ESDIAD detector with time-of-flight capability which
allows mass and angle resolved ion detection. We find F- and F-2 to d
esorb from PF3, yielding hexagonal ESDIAD patterns, and Cl- and Cl-2(-
) from CCl4, desorbing in a broad normal emission. The ratio of F-2(-)
to F- and of Cl-2(-) to Cl- is more than a factor 10 higher than in e
lectron induced gas phase dissociation. We compare the negative ion yi
elds to those of positive ions.