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  • CarterJLTP2016Excimers

    Rights statement: The final publication is available at Springer via http://dx.doi.org/10.1007/S10909-016-1666-x

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Calorimetric observation of single He2* excimers in a 100 mK He bath

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<mark>Journal publication date</mark>02/2017
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number3
Volume186
Number of pages14
Pages (from-to)183-196
Publication statusPublished
Early online date11/10/16
Original languageEnglish

Abstract

We report the first calorimetric detection of individual He2* excimers within a bath of superfluid 4He. 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. 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 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.

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The final publication is available at Springer via http://dx.doi.org/10.1007/S10909-016-1666-x