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We report on the detection of single photons with {\lambda} = 8 {\mu}m usinga superconducting hot-electron microbolometer. The sensing element is atitanium transition-edge sensor with a volume ~ 0.1 {\mu}m^3 fabricated on asilicon substrate. Poisson photon counting statistics including simultaneousdetection of 3 photons was observed. The width of the photon-number peaks was0.11 eV, 70% of the photon energy, at 50-100 mK. This achieved energyresolution is one of the best figures reported so far for superconductingdevices. Such devices can be suitable for single photon calorimetricspectroscopy throughout the mid-infrared and even the far-infrared.

Energy-resolved detection of single infrared photons with {\lambda} = 8 {\mu}m using a superconducting microbolometer