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A magnetic susceptometer of very high sensitivity and precision has been developed using superconducting technology. Measurements show this instrument has a volume susceptibility sensitivity (in SI units) of Δκ=±9×10−12, and a precision of 0.0001% of the diamagnetism of a typical substance such as water. The capability of measuring magnetic changes during fast reactions in solution has also been demonstrated. System design and measurement techniques are described. The magnitudes and frequency spectra of the noise sources in this type of instrument are analyzed and compared with measured performance.
Philo et al. (Thu,) studied this question.
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