Abstract
We present preliminary experimental evidence that two lasers irradiating a deuterated Pd cathode at a single spot can induce significant thermal changes larger than that expected from laser heating alone. We also report that this effect is observed only when the lasers are tuned to a beat frequency around 8 THz, 15 THz, and 20 THz. These experiments support the notion that optical phonon modes may be involved in the excess heat process.
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