Reaching ultra-high vacuum for a large vacuum vessel in an underground environment

Rolling Contact Fatigue in Ultra High Vacuum

Direct-write polymer nanolithography in ultra-high vacuum

Polymer nanostructures were directly written onto substrates in ultra-high vacuum. The polymer ink was coated onto atomic force microscope (AFM) probes that could be heated to control the ink viscosity. Then, the ink-coated probes were placed into an ultra-high vacuum (UHV) AFM and used to write polymer nanostructures on surfaces, including surfaces cleaned in UHV. Controlling the writing speed...

Selective Hydrogenation of Acetylene over Palladium in Ultra High Vacuum

Under ultra-high-vacuum conditions, precoverage of a palladium(ll1) surface with hydrogen does not affect either the kinetics or the extent of acetylene uptake at 175 K. The subsequent reactive behavior of the system is however radically altered. Benzene formation is strongly suppressed, the transformation of adsorbed acetylene to another species (@-phase) is enhanced, and the yield of ethylene...

Constructing an Ultra-High Vacuum Chamber and a Radio Frequency Helical Resonator for Trapping Ions

We describe the construction of an ultra-high vacuum (UHV) chamber and a radio frequency helical resonator for use in co-trapping atomic and molecular ions. Cleaning procedures for the in-vacuum components are provided. These procedures give positive results in cleaning copper electrodes. The thesis also provides general UHV construction techniques and design choices for our UHV chamber. For th...

Large Vacuum Rabi Splitting in a Single ‎Nitride-Based Quantum WellMicrocavity

   Here, we report a theoretical detailed study of Vacuum Rabi Splitting (VRS) in the system of Nitride Single Quantum Well (SQW) within a semiconductor microcavity. Distributed Bragg Reflectors (DBRs) containing ZnTe/ZnSe multilayers including GaAs microcavity and  ( SQW at the center of microcavity, has been considered. Upper and lower exciton-polariton branches obtaine...