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Molekularakustische Untersuchungen über die Fortpflanzung des ersten und Zweiten Schalls im flussigen helium He4

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In a preceding investigation absorption curves for first and second sound were calculated. In continuation of that paper a study has now been made by molecular acoustic techniques for the atomic reason of the occurrence of second sound. Without using the hypothetical twoliquid model it follows that the so-called inner atomic sum term (Atomsummand) of helium determines both the collision coefficient and the nature of second sound. While first sound is made up of longitudinal waves, second sound is the propagation of angular momentum by the rotation of atoms in gear wheel-like connection, essentially without any density changes. Thus the rotons known from quantum theory obtain a clear significance.
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Document Type: Research Article

Publication date: January 1, 1963

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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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