https://www.toppr.com/ask/question/the-amplitude-of-electric-field-in-a-parallel-light-beam-of-intensity-4wm2-is/In this links you see the electromagnetic force an electron will experience if a beam of light walks thru it….
Basically to increase the electric field you can focus the beam to a point and now this come to that movie about cold fusion with Morgan freeman
A focus beam of light interacting with high voltage fields
Basically the light may have enough energy to initially disturb the electron to a position where the electric field applied will be relevant to keep the molecule atoms apart
Because Meyer say there is no current involved it seems to me that the reaction may cause a sort of series discharge along the water thickness as it had hundreds of cells in series… that can only be possible if the point of resonance is achieved because the molecules within the volume is going to be polarized just like the molecules around the plates
Laser energy may be required or maybe focus sunlight could be used for tests… however of course is not practical
Meyer talk about infrareds and visible light
Infrareds are in the absorption spectrum of water as it causes stretching or vibrating and or combinations of it at specific frequencies
The reason why I believe it extremely necessary to really do any effect in the molecule is because of the order of magnitude of the electron field is kind of 1000fold of the obtainable electric field applied to water
If we consider quantum mechanics it tells that there is energy there already and so there may be moments where the electrons are in a region where it is able to receive the electric field
Looking at it from a laser perspective if most of molecules are resting in peace than is not possible to achieve lasing laser occurs when all the energy of the molecules are trigered and released all at once
So we need to pump the molecules to that state to be able to get that triggereable reaction
My educated guess is that this energy would be released in the form of monoatomic molecules that secondarily forms diatomic molecules generating heat (vibration) or perhaps a burst of same light that may return the energy to surrounding molecules of water
If we have a piece of iron laying in the ground and we want a magnet to be able to pull it up it than it need to have a force greater than gravity to start any movement of the iron in the up direction.
Similarly if water is in the energy range where it has a rest state it will not be able to oscillate by the electric field applied if it’s not greater than the force holding the water together, however I imagine that any disturbance invalidates this already since it is not in rest state anymore than there may be interaction of the applied electric field to some extent even if very small.