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Measurements of the Temperature Dependence of the Oscillation-Relaxation in Sulphurhexafluoride Between −20 °C and +20 °C

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Ultrasonic absorption in SF6 was measured with an interferometer of two Sell-transducers at the temperatures −20 °C, 0 °C and +20 °C. The frequency was varied between 50 kHz and 600 kHz, the pressure between 10 mm Hg and 400 mm Hg. As regards the non-ideality of the gas the absorption measurements yield values αλmax which agree well with the data calculated from the thermal oscillation. The number of collisions Z 1 was calculated from the relaxation-time Z‴ for the oscillation mode with lowest characteristic frequency ν 1.

The classical Landau-Teller theory describes the temperature dependence of the number of collisions by the law ln Z 1T −⅓. This law is confirmed by the measurements at higher temperatures. At temperatures lower than +20 °C, where van der Waals-forces gain importance, the collision numbers are lower than expected from the classical Landau-Teller theory. Corresponding to the extended theory the deviation from the straight line obtained for the higher temperatures increases with decreasing temperature.
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Document Type: Research Article

Publication date: January 1, 1970

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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