W. Kundig

University of Zurich, Zürich, Zurich, Switzerland

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Publications (13)6.58 Total impact

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    ABSTRACT: We have measured Newton's gravitational constant with a commercially available mass comparator. In this experiment, the difference of the gravitational force of 13,600 kg mercury on two 1.1 kg copper masses was measured with a relative statistical uncertainty of 16.3times10-6. Including the systematic uncertainties we determine the gravitational constant G to be 6.674 252(122)times10-11 m3kg-1s-2.
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    ABSTRACT: The goal of our experiment is a precision measurement of the gravitational constant G by means of a beam balance. The gravitational forces of two large and movable field masses act on test masses and change their weights. First measurements have been successfully completed with a relative uncertainty of 230 ppm. Since then various upgrades and improvements have been implemented.
    Precision Electromagnetic Measurements, 2002. Conference Digest 2002 Conference on; 02/2002
  • F. Nolting, J. Schurr, W. Kundig
    Europhysics news 07/2000; 31(4):25-27. DOI:10.1051/epn:2000406
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    ABSTRACT: We describe an experiment to measure the Newtonian gravitational constant G. The gravitational forces of large field masses on test masses are measured using a beam balance. A preliminary result with a relative uncertainty of 220×10<sup>-6</sup> has been published recently. In the meantime various modifications of the experiment have been made
    Precision Electromagnetic Measurements Digest, 2000 Conference on; 02/2000
  • F. Nolting, J. Schurr, W. Kundig
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    ABSTRACT: We are carrying out a high-precision measurement of the gravitational constant G by means of a beam balance. Test measurements with water as field masses have been made and G has been determined with an uncertainty of 240×10<sup>-6</sup>. In the next step 13.5 tons of mercury will be used as field masses. The preparations for these measurements are briefly described in this paper
    IEEE Transactions on Instrumentation and Measurement 05/1999; DOI:10.1109/19.769574 · 1.71 Impact Factor
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    ABSTRACT: this report. Presently, preparations are made for measurements with higher accuracy.
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    ABSTRACT: 5.26> 7.1 Simulation of scattering The spectrometer was designed to minimize the probability that electrons scattered from baffles etc. can reach the detector. It could however not completely be avoided and caused a (small) distortion of the measured fi--spectra. Experimentally we have investigated scattering by accelerated photo-electrons with energies up to 50 keV. As the scattering distribution is a function of two variables, the initial energy of an electron and the energy with which it is detected, a complete measurement was not feasible. We have developed a Monte-Carlo program to simulate scattering. Figure 7.1 shows a comparison of the simulation with measured data. We find good agreement, but only if the most elaborate cross sections are used. The simulation gives us a good understanding of the scattering and we can use computed scattering distributions to correct the measured fi--spectra. 7.2 Results for 63 N
  • W. Kundig, F. Nolting, J. Schurr
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    ABSTRACT: f 500 l. They will be filled first with water, later with mercury. The weight signal is expected to be about 53 50 g when the vessels are empty, 110 g with water and 780 g with mercury. We can thus make three different measurements of the gravitational force. The comparison of the results enables important consistency checks and should allow us to investigate possible sources of systematical uncertainties. The result with the best statistical uncertainty will of course be obtained with mercury. The balance has been made available by Mettler-Toledo and is one of the most precise balances in the world. It has been developed to compare 1-kg masses with high accuracy. The resolution of the balance is 100 ng and is further improved to 10 ng by averaging many weighings. A differential measurement with such a mass comparator is advantageous, since many disturbing forces and drift effects cancel in the weight difference. The balance can
  • F. Nolting, J. Schurr, W. Kundig
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    ABSTRACT: We are preparing a high precision measurement of the gravitational constant G, using a new technique. This technique is based on a flexure strip beam balance and an optimised mass arrangement. In this paper we describe the principle of this experiment
    Precision Electromagnetic Measurements Digest, 1996 Conference on; 07/1996
  • E HOLZSCHUH, M FRITSCHI, W KUNDIG
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    ABSTRACT: Measurements of the tritium β-spectrum are reported. Thin sources consisting of a monolayer of tritiated hydrocarbon molecules were used. No indication of a nonzero mass mν of the electron antineutrino was found. The result is mν2 = −24 ± 48 ± 61 eV2 (1σ). An upper limit mν < 11 eV (95% confidence level) is derived.
    Nuclear Physics B - Proceedings Supplements 04/1993; 31:42-45. DOI:10.1016/0920-5632(93)90109-J · 0.88 Impact Factor
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    ABSTRACT: Diamond, both natural and metastable as well as stable growth synthetic, is a material of particularly attractive physical properties. In the characterization of diamond, light volatiles appear to play a significant role both in the determination of properties and in the control of the growth process itself. Historically nitrogen was perceived as the dominant impurity in natural diamond, but in the past decade both oxygen and hydrogen have been shown to be prolific to largely the same degree. This paper takes stock of the state of the art in the study of hydrogen in and on diamond of both natural and synthetic genesis. This includes the study of the surface and bulk hydrogen depth distribution as assayed by traditional nuclear reaction analysis, as well as recent high resolution resonant nuclear reaction analysis of hydrogen as it formally addresses the true surface of diamond. These analytical approaches are valuably complemented by the more subtle use of time dependent perturbed angular distribution studies which are shown to pick out a molecular hydrogen component in the bulk of diamond. Positively charged muons may combine with electrons to form the atom ``muonium'', which for all practical purposes disports itself as a light isotope of hydrogen: muonium spin rotation studies are exploited in a radiation damage free manner to study the properties of hydrogen in diamond. Finally some specific work on hydrogen in CVD diamond (-like) materials is considered.
    Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 05/1992; 68:133-140. DOI:10.1016/0168-583X(92)96064-6 · 1.19 Impact Factor
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    ABSTRACT: Measurements of conversion electrons from the outermost valence shell of ion implanted, dilute impurity atoms in semiconductors are described. The measured spectra can be directly related to the local density of states at the probe atoms. Results obtained for Sn and Ge impurities in group IV and III-V semiconductors are compared to theoretical calculations using the LMTO approach. Possible future applications of the method are discussed.
    Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 01/1992; 63(1-2):179-185. DOI:10.1016/0168-583X(92)95191-S · 1.19 Impact Factor
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    ABSTRACT: Measurements of conversion electrons from the outermost valence shells of ion implanted, dilute impurity probe atoms in solids are reported. The measured spectra are directly related to the local density and angular momentum character of the occupied electron states at the probe atom. Thus the valence electron configuration of implanted probe atoms in solids has been investigated. First results for the probes Sn and Ge in Si, Ge, GaAs, Pd, and beta-Sn are compared to theoretical calculations.
    Physics Letters A 05/1990; 146(4):226-230. DOI:10.1016/0375-9601(90)90170-S · 1.63 Impact Factor