  The phenomenon of Euclidean resonance (a strong enhancement of quantum
tunneling through a nonstationary potential barrier) is applied to
disintegration of atoms and molecules through tunnel barriers formed by applied
constant and time-dependent electric fields. There are two different channels
for such disintegration, electronic and ionic. The electronic mechanism is
associated with the ionization of a molecule into an electron and a positive
ion. The required frequencies are in a wide range between 100 MHz and infrared.
This mechanism may constitute a method of selective destruction of chemical
bonds. The ionic mechanism consists of dissociation of a molecule into two
ions. Since an ion is more massive than an electron, the necessary frequency is
about 1 MHz. This provides a theoretical possibility of a new method of isotope
separation by radio frequency waves.
