  A quantum control mechanism is proposed for molecular fragmentation processes
within a scenario grounded on the quantum Zeno effect. In particular, we focus
on the van der Waals Ne-Br$_2$ complex, which displays two competing
dissociation channels via vibrational and electronic predissociation.
Accordingly, realistic three dimensional wave packet simulations are carried
out by using ab initio interaction potentials recently obtained to reproduce
available experimental data. Two numerical models to simulate the repeated
measurements are reported and analyzed. It is found that the otherwise fast
vibrational predissociation is slowed down in favor of the slow electronic
(double fragmentation) predissociation, which is enhanced by several orders of
magnitude. Based on these theoretical predictions, some hints to
experimentalists to confirm their validity are also proposed.
