  We present arguments for the hypothesis that under some conditions, triple
correlations of density fluctuations in fluids can be detected experimentally
by the method of molecular spectroscopy. These correlations manifest themselves
in the form of the so-called 1.5- (i.e., sesquialteral) scattering. The latter
is of most significance in the pre-asymptotic vicinity of the critical point
and can be registered along certain thermodynamic paths. Its presence in the
overall scattering pattern is demonstrated by our processing experimental data
for the depolarization factor. Some consequences of these results are
discussed.
