| "Excess Heat" triggering by a YAG double frequency laser withpalladium hydrides in different gas-loading ratios was studied in aHydrogen/Palladium gas-solid system. When the temperature of the systemreached steady, the thermal responses were being measuring after theinteraction of the laser with pure and some hydrogen-contained palladiumhydrides. The influence between the densities of laser power, hydrogencomposition in palladium (hydrogen-loading ratio) and "excess heat" amountwas studied. The method of hydrogen gas-loading into palladium lattice wasadopted under the conditions of room temperature and quasi-atmospherepressure (P＜1atm H2). The experimental results indicated that: hydrogenatom could be loaded into Pd crystal lattice under room temperature and thehydrogen-loading ratio(x=[H]/[Pd]) could reach 0.85±0.01. By changinglaser pulse frequency (four models) and working voltage (four models), thesixteen kinds of different power lasers were used in the experiment of lasertriggering palladium hydrides. The palladium hydrides with differenthydrogen-loading ratios (0,0.20,0.29,0.40 and 0.85) were irradiated bythese lasers and the heat responses are: in all of the sixty "excess heat"experiment, there were about 21.7% (thirteen groups) showed thephenomenon of the "excess heat" when palladium hydrides were triggered bythe laser. As the gas-loading ratio was increased (x＞0.20), the occurrencefrequency of "excess heat" decreased. When the hydrogen-loading ratio was0.85±0.01, no "excess heat" could be observed. That is to say, "excess heat"was easier to appear within some relatively lower gas-loading ratio in oursystem. In this dissertation, the largest "excess heat" power was64.45±0.08mW, where x was 0.21±0.01, with the input laser power of 0.70±0.01W. During the interaction of laser on the palladium hydride (3.6×103seconds), the "excess heat" energy was about 232.26±0.03J; the averageenergy released by each Pd atom was (4.62±0.006)×10-17J,and(8.87±0.03)×10-17J for each hydrogen atom. The smallest "excess heat"power was 1.42±0.02mW and during the 3.6×103 seconds interaction time,the "excess heat" energy was 5.10±0.08J. Similarly the average heat energyfor each Pd was (1.01±0.02)×10-18J and (5.07±0.07)×10-18J for each H atom.The reason of only about 21% of "excess heat" appeared in whole laser triggering experiments might be as follows: although the resonant wavelengthof hydrated palladium with present experimental system (35.05±0.08℃) wasnot 532nm, the "excess heat" could be achieved by adjusting gas-loadingratio within the palladium when the hydrated palladium was irradiated bynon-resonant wavelength laser.
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