2013 Spring Graduate Colloquium Series: Suman Baral/Dhurba Sapkota

DateFebruary 15, 2013Time3:35 - 5:00 pm
LocationBaylor Sciences Building, Room E.125
Description
Suman Baral

Electron-Scattering Cross Sections for 1-Butene and 2-Methylpropene Molecules

To fully understand the interaction between electrons and molecules we need to have a comprehensive set of total scattering cross sections. Cross sections of electrons on hydrocarbons are crucial because of the large abundancy of hydrocarbons (in living cells, organic compounds etc) and the cascading of electrons due to ionization. In this talk, I will present the theory, technique and procedure used by researchers to determine the absolute total cross sections of different energy ranges for an electron on 1-butene and 2-methyl propene. These molecules are commonly used in the production of rubber, gasoline, and surface coatings. The result of this research will enhance the modeling and controlling physico-chemical reactions significant for such technologies. (Based on: P. Możejko, et al., J. Phys. B: At. Mol. Opt. Phys. 45 145203 (2012)).

Dhurba Raj Sapkota

Forced Evaporative Cooling of the Hydroxyl Radical

Forced evaporative cooling led to the observation of Bose-Einstein Condensation, quantum-degenerate Fermi gases and ultracold optical lattice simulations of condensed-matter phenomena. Due to unfavorable ratios of elastic to inelastic scattering and slow thermalization rates in the available trapped species, there are still some problems in this approach. It is reported that this technique is used in neutral hydroxyl (OH) molecules loaded from a Stark-decelerated beam into an extremely high-gradient magnetic quadrupole trap. Spectroscopic thermometry shows the order of cooling in temperature, and a corresponding increase in phase-space density. (Based on: B. K. Stuhl, et al., Nature 492, 396–400 (2012)).

For more information, please contact: Dr. Linda Olafsen 254-710-2541

PublisherPhysics
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