Electric Charging Effects on Insulating Surfaces in Cryogenic Liquids

This paper presents a new technique to study the adsorption and desorption of ions and electrons on insulating surfaces in the presence of strong electric fields in cryoliquids. The experimental design consists of a compact cryostat coupled with a sensitive electro-optical Kerr device to monitor the...

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Published inarXiv.org
Main Authors Korsch, Wolfgang, Broering, Mark, Timsina, Ashok, Leung, Kent K H, Abney, Joshua, Budker, Dmitry, Filippone, Bradley W, He, Jiachen, Kandu, Suman, McCrea, Mark, Murchhana Roy, Swank, Christopher, Yao, Weijun
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 31.12.2023
Subjects
Design of experiments
Deuteration
Dipole moments
Electric dipoles
Electric fields
Helium ions
Ion adsorption
Polybutadiene
Polymethyl methacrylate
Polystyrene resins
Surface chemistry
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Summary:This paper presents a new technique to study the adsorption and desorption of ions and electrons on insulating surfaces in the presence of strong electric fields in cryoliquids. The experimental design consists of a compact cryostat coupled with a sensitive electro-optical Kerr device to monitor the stability of the electric fields. The behavior of nitrogen and helium ions on a poly(methyl methacrylate) (PMMA) surface was compared to a PMMA surface coated with a mixture of deuterated polystyrene and deuterated polybutadiene. Ion accumulation and removal on these surfaces were unambiguously observed. Within the precision of the data, both surfaces behave similarly for the physisorbed ions. The setup was also used to measure the (quasi-)static dielectric constant of PMMA at T = 70 K. The impact of the ion adsorption on the search for a neutron permanent electric dipole moment in a cryogenic environment, like the nEDM@SNS experiment, is discussed.
ISSN:2331-8422