Polarized Optical Microscopy: Understanding crystalline morphology and manipulations in biopolymer Polylactic acid (PLA)

Polarized Optical Microscopy (POM) is a technique used to quantitatively and qualitatively characterize birefringent samples. Image contrast arises from the optically anisotropic samples interacting with plane polarized light to produce two individual, perpendicular wave components. POM is commonly used to study crystalline morphology in plastics and composites, as well as to visualize fundamental polymer orientations and crystallization phenomena.

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Going Where Few Dare To: Investigating the Reactivity and Structure of Uranium Species Using Ion Trap Mass Spectrometry

Electrospray ionization and ion-trapping methods of mass spectrometry have significantly improved our ability to study gas-phase ion chemistry, and to determine the intrinsic structure and reactivity of metal ions and metal ion complexes. Ion traps with multi-dimensional (MSn) tandem mass spectrometry capabilities are versatile gas-phase "laboratories" within which ions can be manipulated and studied. Ion traps can also function as “sample cuvettes" for structure determination using wavelength-selective infrared photodissociation.

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Magnetic field effects on radical pair reactions – from bird navigation to chemical compasses and novel spectroscopic tools

Weak magnetic fields (< 30 mT) can have a profound influence on radical pair reactions. This is, at first sight, puzzling since the magnetic interactions are typically much smaller than the thermal energy at room temperature. The radical pair is created in a highly non-equilibrium state, however, displaying significant mixing between its singlet and triplet spin states. The mixing rate is altered if a magnetic field is present via the Zeeman interaction.

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Will the Real Finite-Temperature Perturbation Theory Please Stand Up?

Chemical applications of statistical mechanics typically assume that the electronic partition function is trivial, as all members of the system are in the ground electronic state. When this approximation breaks down (example: electrical conductors), it is necessary to combine statistical mechanics and electronic structure theory to determine the electronic partition function. This composite theory is called a "finite-temperature" theory. The oldest finite-temperature theory is finite-temperature perturbation theory (FTPT). In 2013, Prof.

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