[PEGASUS] Summer Seminar Series: Kimberlee Dube

Please join us Tuesday, July 4 in Physics 175 for our next presentation in our PEGASUS Summer Seminar Series.
Our next speaker is Kimberlee Dube, who studies ozone and aerosol profiles using OSIRIS.
There will be cookies and refreshments served beforehand at 3:00 pm in the lounge for those attending the seminar.
Title: The effect of solar rotation on OSIRIS ozone and aerosol observations 
Abstract:
The amount of solar radiation reaching the Earth’s atmosphere varies with both the 11 year solar cycle and the 27 day solar rotation period. The Optical Spectrograph and InfraRed Imager System (OSIRIS) has been in orbit on the Odin satellite since late 2001. The effect of solar UV variability on ozone and aerosol profiles retrieved from OSIRIS was investigated for a 14 year period. Current results will be presented and compared with those from other limb instruments.

[PEGASUS] Summer Seminar Series: Caelia Gardiner

Please join us this Tuesday, June 20 in Physics 175 for our next presentation in our PEGASUS Summer Seminar Series.
Our next speaker is Caelia Gardiner, who studies oxygen spectral emissions in the mesosphere and lower thermosphere.
There will be cookies and refreshments served beforehand at 3:00 pm in the lounge for those attending the seminar.
Title: Oxygen A Band Emission in the SaskTran Radiative Transfer Framework
Abstract:
Oxygen emission is a contributor to day glow in the mesosphere and lower thermosphere (MLT). The emissions occur in the atmospheric band of oxygen, which ranges from 629 nm to 762 nm, and corresponds to oxygen’s second electronic excited state. There are three vibrational levels within the atmospheric band, with the A band representing the lowest level. Emissions in the A band are centred around 762 nm and are the most significant contributor to oxygen emissions in the atmospheric band. The SaskTran radiative transfer framework is a software model that simulates light propagation through the atmosphere to produce radiance profiles. While it currently includes oxygen absorption in the A band, oxygen emission has yet to be implemented. Modelling the volume emission rate of oxygen molecules in the A band by use of HITRAN data and photochemical processes will provide the information necessary to simulate oxygen emission with SaskTran. This work is also done in support of the Swedish satellite MATS (Mesospheric Airglow/Aerosol Tomography and Spectroscopy), which will take optical measurements of mesospheric gases. Understanding the process of oxygen A band emission through simulation and measurement will improve scientific understanding of the MLT and provide valuable data for other atmospheric study.

[PEGASUS] Summer Seminar Series: William Elcock

Please join us this Tuesday, June 13 in Physics 175 for our next presentation in our PEGASUS Summer Seminar Series.
Our next speaker is William Elcock, who studies hysteresis in perovskite solar cells.
There will be cookies and refreshments served beforehand at 3:00 pm in the lounge for those attending the seminar
 
Title: Hysteresis in Perovskite Solar Cells
 
Abstract:
Perovskite solar cells have demonstrated power conversion efficiencies (PCEs) greater than 20%. However, current density-voltage (J-V) hysteresis (i.e. a difference in photocurrent between forward and reverse scans) makes it difficult to determine the true PCE of perovskite solar cells. The mechanism behind this hysteretic behaviour is not yet fully understood. However, the accumulation of halide ions at the perovskite active layer/contact interface has been put forward as a possible explanation behind this phenomenon. With this talk, I will give a background on hysteretic phenomena and the challenges posed by hysteresis in perovskite solar cells. I will also explain how the proposed ion migration mechanism results in hysteretic behaviour.

[PEGASUS] Summer Seminar Series: Jason Ho

Please join us this Tuesday, June 6 at 3:30 pm in Physics 175 for our first presentation in our PEGASUS Summer Seminar Series.
Our first speaker is Jason Ho, who studies exotic hadrons in the context of QCD sum rules.
There will be cookies and refreshments served beforehand at 3:00 pm in the lounge for those attending the seminar.
Title: Calculation of Open-Flavour Heavy-Light Hybrid Mass Spectrum from QCD Sum Rules
Abstract:
Our current understanding of the strong interaction (QCD) permits the construction of colour singlet states with novel structures that do not fit within the traditional quark model, including hybrid mesons. To date, though other exotic structures such as pentaquark and tetraquark states have been confirmed, no unambiguous hybrid meson signals have been observed. However, with data collection at the GlueX experiment ongoing and with the construction of the PANDA experiment at FAIR, the opportunity to observe hybrid states has never been better.
As theoretical calculations are a necessary piece for the identification of any observed experimental resonance, we present our mass predictions of heavy-light open-flavour hybrid mesons using QCD Laplace sum-rules for all scalar and vector $J^{P}$ channels, and including non-perturbative condensate contributions up to six-dimensions.