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Diffraction of Thermal Waves in Liquid Helium II


Mercereau, James Edgar (1959) Diffraction of Thermal Waves in Liquid Helium II. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/RFXN-ND58.


Diffraction effects in thermal radiation have been produced in liquid helium II by means of a thermal grating radiating a primary (zero-order) beam accompanied by higher order beams at appropriate "Bragg" angles. These results at once demonstrate unambiguously the true wave nature of this thermal wave propagation and its conformity to Huygens' principle in the most demanding test to which second sound has been subjected. The general nature of the angular pattern, including the fine structure, conforms to the requirements of diffraction behavior for more customary wave motions. A determination of wave velocity (V2) for second sound is obtainable from the observed Bragg angles. Results of an investigation on the propagation of second sound in rotating liquid helium are presented.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics and Engineering Science)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Pellam, John R.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1959
Record Number:CaltechETD:etd-02102006-082551
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:593
Deposited By: Imported from ETD-db
Deposited On:10 Feb 2006
Last Modified:18 Oct 2023 22:25

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PDF (Mercereau_je_1959.pdf) - Final Version
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