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Calorimetric Observation of Single He2∗ Excimers in a 100-mK He Bath
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Calorimetric Observation of Single He2∗ Excimers in a 100-mK He Bath
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Journal Article
Calorimetric Observation of Single He2∗ Excimers in a 100-mK He Bath
2017
Overview
We report the first calorimetric detection of individual
He
2
∗
excimers within a bath of superfluid
4
He
. The detector used in this work is a single superconducting titanium transition edge sensor (TES) with an energy resolution of
∼
1
eV
, immersed directly in the helium bath.
He
2
∗
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
≈
15
eV
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
≈
15
eV
, released upon decay, into the surface. We also briefly discuss the detector fabrication and characterization.
Publisher
Springer US
