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Calorimetric Observation of Single He2∗ Excimers in a 100-mK He Bath

  • Author(s): Carter, FW
  • Hertel, SA
  • Rooks, MJ
  • McClintock, PVE
  • McKinsey, DN
  • Prober, DE
  • et al.
Abstract

© 2016, The Author(s). We report the first calorimetric detection of individual He2∗ excimers within a bath of superfluid4He. The detector used in this work is a single superconducting titanium transition edge sensor (TES) with an energy resolution of ∼1eV, immersed directly in the helium bath. He2∗ excimers are produced in the surrounding bath using an external gamma-ray source. These excimers exist either as short-lived singlet or long-lived triplet states. We demonstrate detection (and discrimination) of both states: In the singlet case the calorimeter records the absorption of a prompt ≈15eV photon, and in the triplet case the calorimeter records a direct interaction of the molecule with the TES surface, which deposits a distinct fraction of the ≈15eV, released upon decay, into the surface. We also briefly discuss the detector fabrication and characterization.

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