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oai:www.ideals.illinois.edu:2142/81177 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

U of I Only Lyding, Joseph W. Foley, Edward Thomas 2015-09-25T20:09:55Z 2015-09-25T20:09:55Z 10000-01-01 1997 1997 A cryogenic ultra-high vacuum (UHV) scanning tunneling microscope (STM) has been developed. This design utilizes a novel vibration isolation scheme which provides excellent thermal coupling to a cooling source. The cooling scheme departs from other cryogenic UHV STMs where vibration isolation and cooling compete with each other. Variable temperature operation from 11 K to 300 K has been demonstrated. Future improvements will enable operation down to 1.5 K. This system has been used to perform low temperature desorption studies of hydrogen and deuterium from Si(100) surfaces. Comparing these results to previous room temperature studies indicates that there is no temperature dependence to the desorption in the high voltage field emission regime. However, in the low voltage vibrational heating regime a strong temperature dependence is observed, with the desorption yield for hydrogen at 11 K being 300 times greater than at 300 K. In the context of Avouris' vibrational heating model, these data are consistent with an increase in the Si-H vibrational lifetime from 10 ns at 300 K to 19 ns at 11 K. By similar analysis, the Si-D vibrational lifetime increases from 0.25 ns at 300 K to 0.85 ns at 11 K. Made available in DSpace on 2015-09-25T20:09:55Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9737104.pdf: 3365670 bytes, checksum: 442c4f2b69a0a032c9cca87ddd6efb28 (MD5) Previous issue date: 1997 Embargo set by: Seth Robbins for item 82458 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs 98 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997. http://hdl.handle.net/2142/81177 (MiAaPQ)AAI9737104 eng Chemistry, Physical Cryogenic Ultra-High Vacuum Scanning Tunneling Microscopy of Electron-Stimulated Desorption of Hydrogen and Deuterium From Silicon(100) text Electrical Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.