Optical Observation of Spontaneous Heat Burst Phenomena during Hydrogen Desorption from Nano-Sized Metal Composite

Takehiko Itoh, Yoshinobu Shibasaki, Tomonori Takahashi, Mari Saito, Jirohta Kasagi, Yasuhiro Iwamura

Research output: Contribution to journalConference articlepeer-review


We have constructed a photon measurement system to observe the radiant power emitted from an NiCu multilayer film for a wide energy range, from visible light to mid-infrared light. Using the new system, we attempted to measure the radiation from the sample when a heat burst occurred while anomalous excess heat was being continuously generated. About 10 big burst events were observed during the 5-day continuous measurement: it was found that the radiation intensity increased simultaneously as the heater temperature suddenly increased. We have made a comparison of the radiant spectrum of the burst event with the spectrum in normal times. There is no particular difference due to the burst; both spectra can be simply interpreted as grey body radiation emitted from a thermally equilibrated object. The correlation of radiant intensity between near-IR and visible light has been deduced; although it is expected there is a linear correlation between them, two correlation lines can be drawn instead of one. This indicates that the contribution of photon emission from the non-equilibrium stage may have an effect.

Original languageEnglish
Pages (from-to)274-284
Number of pages11
JournalJournal of Condensed Matter Nuclear Science
Publication statusPublished - 2022
Event23rd International Conference on Condensed Matter Nuclear Science, ICCF 2021 - Virtual, Online, China
Duration: 2021 Jun 92021 Jun 11


  • Anomalous heat
  • Excess heat
  • Gas loading
  • Heat burst
  • Hydrogen gas
  • Multilayer thin film
  • Nano material
  • Nano-sized metal composite
  • Optical observation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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