Interesting… This cited work with photonic crystals would be even more relevant if palladium hydride is a photonic crystal. Is it?
It could be … but I cannot find a direct reference for that. Yet palladium as an element is photoactive, and it turns up often in a search of photonic crystals but not as hydride. Here is the type of article that turns up but it is not on point. https://aip.scitation.org/doi/10.1063/1.3690085 Still – the photonic crystal as a feature of the Letts/Cravens effect, has explanatory appeal and would be important with a bit more evidence – plus -- the Holmlid effect is using a different substrate – basically hematite modified as a styrene (spillover) catalyst. Hematite itself does have photonic properties and, as it turns out, hematite works as a spillover catalyst when it is thermally activated with potassium. Potassium is photoactive, particularly as an ionic crystal. Thus, a few of the details fit into place as an emerging MO … a common denominator between the two experiments. It may be a stretch, but there seems to be a valid case for the proposition that the Letts/Cravens effect is related to photon coherence, via the beat wave of two lasers which are being tuned to the resonance of a photonic crystal which is a hydride in which the resonance level is in the THz range. As of now, there is no available coherent photon source for THz - but these lasers are on the way as they have military significance. The resonance for iron ferrite may correspondingly be in the visible range (yellow-green) OR the brute force effect of a more powerful light source overwhelms the need for an exact resonance. There is no need to invoke Hawking radiation. We simply have one coherent light source (a laser) stimulating photonic crystal in a high Q mutual feedback arrangement. Conservation of miracles, you know 😊 Of course, for this possibility to get any traction - it is imperative that a muon detector be used in a Letts/Cravens experiment … From: Axil Axil An experiment similar to Letts-Cravens. http://iopscience.iop.org/article/10.1088/0957-4484/26/23/234002 Experimental observation of anomalous thermal radiation from a three-dimensional metallic photonic crystal Abstract We report some striking results on thermal radiation properties of a resonantly coupled cavity photonic crystal (PhC) at elevated temperatures (T = 400–900 K). We experimentally found that at resonant wavelengths, λ = 1.1, 1.64, 2.85 μm, the PhC emission is spectrally selective, quasi-coherent, directional, and shows significant deviation from Planck's blackbody law at equilibrium. The presence of non-equilibrium effects, driven by strong thermal excitation and cavity resonance, may be the major cause for our experimental observation. Sooner or later, science would stumble over some sort of LENR reaction. thermal radiation coming off this photonic crystal (PhC) is up to 50 times stronger than blackbody radiation at certain frequencies. That radiation is coherent, directional, and focused. This finding has the researchers puzzled. I speculated that the coupled cavities in this crystal form a polariton Bose condensate that emits hawking radiation at specific thermal frequencies. There also may be some overunity here: more energy out than in... Near infrared is resonant with the size of the optical cavity. Bob Higgins wrote: Jones, I don't think the Letts-Cravens experiment is similar to Holmlid at all. They used two calibrated wavelength lasers superimposed on the cathode. They found that when the lasers were separated by a specific frequency difference in the 10-20 THz range, there was a peaking in the XP. For there to be a frequency difference effect, there must be a nonlinearity - likely a surface plasmon at the cathode surface - that allows the difference frequency to form. The difference frequency of 10-20 THz where there was a peak in XP is VERY suggestive of phonon stimulation, something compeletely different than Holmlid's experiment.
