Mercereau, James E. (1959) Diffraction of thermal waves in liquid helium II. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-02102006-082551
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.))|
|Degree Grantor:||California Institute of Technology|
|Division:||Physics, Mathematics and Astronomy|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 January 1959|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||10 Feb 2006|
|Last Modified:||26 Dec 2012 02:30|
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