22.06.2018
You do not have to touch a hot stove to feel its heat. If it is hot enough, you can see it glow. But, even at a lower temperature it still emits light – although not visible to the human eye, but in the [...] experiments was to monitor the electron detachment in a time-resolved manner and to reconstruct the temporal development of the thermal distribution of the clusters’ internal energy. To this end, the clusters [...] which was contributed to these measurements by a research group from the University of Kaiserslautern, the clusters were observed to warm up over time. In both cases, the clusters tried to gain an equilibrium
https://www.uni-greifswald.de/universitaet/information/aktuelles/detail/n/thermal-radiation-from-tiny-particles-30905/