M. Bordag, G. L. Klimchitskaya, U. Mohideen, and V. M. Mostepanenko
- Published in print:
- 2009
- Published Online:
- September 2009
- ISBN:
- 9780199238743
- eISBN:
- 9780191716461
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199238743.003.0019
- Subject:
- Physics, Condensed Matter Physics / Materials, Atomic, Laser, and Optical Physics
This chapter starts chronologically with the first measurement, by means of a torsion pendulum, in the recent phase of Casimir force experiments. Then the main breakthroughs in the measurement of the ...
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This chapter starts chronologically with the first measurement, by means of a torsion pendulum, in the recent phase of Casimir force experiments. Then the main breakthroughs in the measurement of the Casimir force between metallic surfaces are presented. One of them was the first demonstration of corrections to the Casimir force due to the nonzero skin depth and surface roughness by means of an atomic force microscope. Another breakthrough was a series of precise indirect measurements of the Casimir pressure by means of a micromechanical torsional oscillator. These measurements allowed a definitive choice between different theoretical approaches to the thermal Casimir force for real metal surfaces. Many other experiments performed in the last few years are also presented, specifically one measurement using the configuration of two parallel plates. The chapter ends with a brief discussion of proposed experiments using metallic surfaces.Less
This chapter starts chronologically with the first measurement, by means of a torsion pendulum, in the recent phase of Casimir force experiments. Then the main breakthroughs in the measurement of the Casimir force between metallic surfaces are presented. One of them was the first demonstration of corrections to the Casimir force due to the nonzero skin depth and surface roughness by means of an atomic force microscope. Another breakthrough was a series of precise indirect measurements of the Casimir pressure by means of a micromechanical torsional oscillator. These measurements allowed a definitive choice between different theoretical approaches to the thermal Casimir force for real metal surfaces. Many other experiments performed in the last few years are also presented, specifically one measurement using the configuration of two parallel plates. The chapter ends with a brief discussion of proposed experiments using metallic surfaces.
Dmitri I. Svergun, Michel H. J. Koch, Peter A. Timmins, and Roland P. May
- Published in print:
- 2013
- Published Online:
- December 2013
- ISBN:
- 9780199639533
- eISBN:
- 9780191747731
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199639533.003.0004
- Subject:
- Physics, Crystallography: Physics
Chapter 3 describes the practicalities of performing SAXS and SANS experiments. The preparation of the sample is of utmost performance and is similar for both techniques. The data processing which is ...
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Chapter 3 describes the practicalities of performing SAXS and SANS experiments. The preparation of the sample is of utmost performance and is similar for both techniques. The data processing which is common to the two techniques is described, followed by two sections devoted to specific issues—in the case of SAXS the effects of radiation damage and for SANS the special advantages of contrast variation. A section on experimental errors is followed by one on data reduction and the treatment of background. This section overlaps with the following chapter, as it describes aspects of data analysis such as the determination of the radius of gyration (Rg) and the forward scattering I(0), which can provide important feedback concerning data quality and hence the validity of the experimental protocol. Finally, the importance of measuring data on an absolute scale, which allows to determine molecular weights, is discussed.Less
Chapter 3 describes the practicalities of performing SAXS and SANS experiments. The preparation of the sample is of utmost performance and is similar for both techniques. The data processing which is common to the two techniques is described, followed by two sections devoted to specific issues—in the case of SAXS the effects of radiation damage and for SANS the special advantages of contrast variation. A section on experimental errors is followed by one on data reduction and the treatment of background. This section overlaps with the following chapter, as it describes aspects of data analysis such as the determination of the radius of gyration (Rg) and the forward scattering I(0), which can provide important feedback concerning data quality and hence the validity of the experimental protocol. Finally, the importance of measuring data on an absolute scale, which allows to determine molecular weights, is discussed.
