We have confirmed the existence of the BeC62- dianion produced in a Cs-sput
ter negative ion source with a cathode of mixed Be metal and graphite powde
r. Using our laser-accelerator mass spectrometry (AMS) system, we have stud
ied the photoelectric interaction of the dianion and show that it is bound
by more than 1.165 eV relative to any photodetachment or dissociation chann
el. The total cross-section leading to either of the channels for 2.33 eV p
hotons is 6 Mb. (C) 2000 Elsevier Science B.V. All rights reserved.