Calorimetric Observation of Single He 2 ∗ Excimers in a 100-mK He Bath

Journal of Low Temperature Physics
F W CarterD E Prober

Abstract

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.

References

Feb 19, 2002·Chemical Reviews·Yoshiya HaradaHiroyuki Ozaki
Feb 1, 2008·Physical Review Letters·W G RellergertD N McKinsey
Aug 8, 2009·Physical Review Letters·W GuoD N McKinsey
May 18, 2013·Physical Review Letters·D E ZmeevW F Vinen
Apr 8, 2014·Proceedings of the National Academy of Sciences of the United States of America·Wei GuoSteven W Van Sciver

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Citations

Sep 22, 2018·Physical Review Letters·Matthew J DolanChristopher McCabe

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