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DTSTAMP:20260609T163846Z
SUMMARY:2012 Spring Graduate Colloquium Series:  Kranti Gunthoti/Bo Zhang
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:Kranti Gunthoti=0D=0A=
Are Quarks and Leptons Elementary or Composite?=0D=0A=
If quarks and leptons are composite particles made up of more basic constituents, an effective four-fermion contact interaction arises between them. So far no evidence has been found supporting the substructure of quarks and leptons. Using 42 pb-1 of data produced by the LHC experiment at a center-of-mass energy of 7 TeV, the ATLAS detector has set 95% CL exclusion limits on the compositeness energy scale Ë for dilepton final states. (Based on the following paper: S. Jain, et al., Phys. Rev. D 84, 011101(R) (2011).)=0D=0A=
Bo Zhang=0D=0A=
Adsorption and Diffusion of Acetone on Rutile TiO2 (110)=0D=0A=
Understanding the surface reaction processes of acetone on metal oxide surfaces is important for photo-oxidation of toxic organic molecules. We have studied the adsorption and the diffusion of acetone on reduced rutile TiO2 (110) surfaces using variable temperature scanning tunneling microscopy (STM). At room temperature acetone molecules prefer to adsorb on bridging-bonded oxygen vacancy sites. The sequential isothermal STM images show that acetone molecules are mobile at RT. They hop between the unoccupied vacancy sites through both the along-row diffusion and the cross-row diffusion. Images obtained at temperatures below RT show that there are two barriers involved in these diffusion processes. One is the acetone diffusion barrier along the Ti row. The other is the diffusion barrier from vacancy site to the neighboring Ti row. The latter is the rate limiting step. DFT calculations agree with experimental results.=0D=0A=
=0D=0A=
 For more information, please contact: Dr. Linda Olafsen x 2541
LOCATION:Baylor Sciences Building, Room E.125
DTSTART;TZID=US_Central:20120413T153500
DTEND;TZID=US_Central:20120413T170000
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