I don't know if this will help answer your questions or not.
That was not an official EU prediction, AFAIK, and there's nothing on the
predictions page regarding LCROSS. There is a prediction page related to the topography of the moon, however.
Here's the last paragraph of the TBPOD
Reconnoitering the Moon:
As we have written in past Picture of the Day articles, the search for water on the Moon will most likely fail. The Moon was not formed by innumerable strikes from high-velocity space rocks or thousands of comets out of a hypothetical Oort Cloud. No water was brought to the Moon by millions of cometary ice balls. The morphology of the Moon shows the signs of electric discharge machining as we have argued many times. No water-bearing impactors formed the terrain there. Rather, it was electricity that carved the Moon, and any water that might have once existed there was dispersed into space by the energy released in the events.
emphasis is mine
IMO, that is probably accurate regarding no water from
comet impacts.
However, there
are personal and "unofficial" predictions for LCROSS, based on EU concepts, that seem to be pretty accurate so far. You kind of have to read the whole thread to get the entire story as more details are presented.
I mentioned that any gases detected would be the result of chemical reactions.
Most, if not all, of the gases detected will be the by-products of electro-chemical/thermatic reaction chains. They'll call it sublimation and photodissociation, though.
What was observed?
A strong UV flash on impact. (NASA: “We aren't sure what that means”) Piezoelectric discharge might be what that means and that UV flash, reported as a flash of sodium, could be evidence to support it.
A rather complex chemical soup, including water vapor, sodium (abundances of Na were a bit of a surprise to NASA, which I predicted btw), carbon dioxide, and possibly methane. I expected a comet like mix of volatile and organic chemicals, and NASA mentioned it was much like a comet, and/or some asteroids. Yeah, I know, previous ancient impacts could deposit similar materials.
A central ejection column of fine dust (finer than expected by NASA, I believe) and vapor that rose more than twice (30km+) as high as predicted by NASA( ~15km). A curtain of heavier material thrown to the sides (which is expected balistically in most impacts anyways) The dust column remained aloft for about four times as long as predicted by NASA. I expected a more energetic impact than NASA predicted, as well as lingering electrostatic dust.
The timeline of the spectrographic data indicate ongoing chemical reactions (NASA mentioned this as part of the data to be examined closer). A very small percentage were actual icy grains so far as they can determine, suspected to be water ice, and the rest of the detected water/hydroxyl groups were in vapor form. I expected that as well, although I'm saying that most of the vapors are by-products of chemical reactions rather than sublimation, and the icy grains are accumulated from molecules and grains migrating across the TCS, of which the water/hydroxyls, among other molecules including CH4, were created by reactions with solar plasma stream protons and silicates in the lunar regolith.
Remember also that these were basically preliminary findings by NASA and the details will be disclosed later. I expect the spectral signature of the vapors (including H
2O and OH) will indicate excitation from an electric field, which would be generated by the piezoelectric effect.
Cheers