Obituary for Dr. Philip E. LaMoreaux

LaMoreaux, James W.; Dörhöfer, Gunter; Witschel, Christian

doi:10.1007/s00254-008-1505-8

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2010

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“…All these observations triggered interest in whether one has to take into account the variation in the contact potential in the analysis of Casimir force experiments or not, and which theoretical model should be used to describe the experimental findings. 7,8 In this article, we present a series of experiments in which we have investigated the behavior of the contact potential between a sphere and a plate under ambient conditions. Measurements as a function of time seem to indicate that water layers adsorbed at the surfaces play an important role.…”

Section: Introductionmentioning

confidence: 99%

Contact potentials in Casimir force setups: An experimental analysis

Man

Heeck

Wijngaarden

et al. 2010

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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The authors present an extensive study of the contact potential difference, V0, between a gold coated sphere and a gold coated plate kept in air at submicron separation. The data confirm that in ambient conditions, V0 depends on both time and separation. They discuss the origin of the time dependence of V0 and elaborate on its functional dependence on separation, d. The data strongly support a log(d) hypothesis but also show that in air this description is not quite complete. These effects might have important implications in the realm of Casimir force experiments.

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Section: Introductionmentioning

confidence: 99%