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Mochel, J.M. Chen, Ming-Tang 2011-05-07T13:59:50Z 2011-05-07T13:59:50Z 10000-01-01 1993 We measure the third sound velocity of superfluid helium films as functions of temperature and film coverage on H$\sb2,$ D$\sb2,$ and Ar substrates. A new phase of superfluid is discovered on the weak-binding H$\sb2$ substrate. We observe, in addition to third sound, a new surface mode of wave propagation in superfluid films. On a D$\sb2$ substrate, we observe a similar phase diagram as on H$\sb2,$ though only the third sound mode is seen. The measurement of the third sound velocity as a function of coverage in the T = 0K limit is in close agreement with the results from two independent theoretical models. The measured third sound velocity is analyzed to yield a Van der Waals constant and an inert layer for $\sp4$He on H$\sb2$ of 13.1 $\pm$ 8 K $\cdot$ Layer$\sp3$ and 0.34 $\pm$ 0.09 Layers, respectively. These values are compared to our previous results, and the results from other groups. Made available in DSpace on 2011-05-07T13:59:50Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9411583.pdf: 4152104 bytes, checksum: 2fca9281bf56cd6dcffc4049b19a409a (MD5) Previous issue date: 1993 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:01:44Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:29:18-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9411583 (UMI)AAI9411583 http://hdl.handle.net/2142/23036 eng Copyright 1993 Chen, Ming-Tang Physics, Condensed Matter Superfluid helium on solid hydrogen text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.