Vibronic Structure in Room Temperature Photoluminescence of the Halide Perovskite Cs3Bi2Br9

We report a study on the optical properties of the layered polymorph of vacancy-ordered triple perovskite Cs3Bi2Br9. The electronic structure, determined from density functional theory calculations, shows the top of the valence band and bottom of the conduction band minima are, unusually, dominated by Bi s and p states, respectively. This produces a sharp exciton peak in the absorption spectra with a binding energy that was approximated to be 940 meV, which is substantially stronger than values found in other halide perovskites and, instead, more closely reflects values seen in alkali halide crystals. This large binding energy is indicative of a strongly localized character and results in a highly structured emission at room temperature as the exciton couples to vibrations in the lattice

The transition state of the f + h2 reaction.

The transition state region of the F + H(2) reaction has been studied by photoelectron spectroscopy of FH(2)(-). New para and normal FH(2)(-)photoelectron spectra have been measured in refined experiments and are compared here with exact three-dimensional quantum reactive scattering simulations that use an accurate new ab initio potential energy surface for F + H(2). The detailed agreement that is obtained between this fully ab initio theory and experiment is unprecedented for the F + H(2) reaction and suggests that the transition state region of the F + H(2) potential energy surface has finally been understood quantitatively

Introduction

Griffith Sciences, inspired by strategic university, national and international change developed a framework called the Griffith Sciences Blended Learning Model to support innovative initiatives utilising technology and to build better practice in blended learning through the use of learning designs and blended learning principles in Science, Technology, Engineering and Mathematics (STEM) higher education. The blended learning model was formulated as a result of an implementation of new technology, to increase buy-in and sustain change in blended learning practice by nurturing the grass-roots initiatives of its academic and professional staff. This chapter introduces the Griffith Sciences Blended Learning Model, how it is being used to implement and document blended learning principles and design in STEM education, the systematic training and support process developed, and the strategies used to promote the scholarly practice in learning and teaching.No Full Tex

Stimulating Curiosity in STEM Higher Education: Connecting Practices and Purposes Through ePortfolios

This chapter identifies the complex problem and challenges that face higher education in Science, Technology, Engineering and Mathematics (STEM) disciplines. In particular, it investigates a conceptual framework to address how to leverage the affordances of learning technologies to improve academic practices and curriculum development within the STEM disciplines? It includes a comprehensive exploration of the literature and evidence-based practices that informs the key themes underlying this challenge. The chapter investigates why change is needed for learning and teaching in STEM disciplines; explores the research findings in STEM higher education; critically reviews reflective practice and academic development; plus considers the barriers to, and drivers for, change to transform STEM higher education. The discussion contextualises the problems and challenges within the setting, parameters and opportunities at Griffith University. Collectively, these considerations inform how the affordances of learning technologies can support integrating professional practices and pedagogical change across purposes, time and space.No Full Tex

Role of water in electron-initiated processes and radical chemistry: Issues and scientific advances

An understanding of electron-initiated processes in aqueous systems and the subsequent radical chemistry these processes induce is critical in diverse fields such as waste remediation and environmental cleanup, radiation processing, nuclear reactors, and medical diagnosis and therapy. This review outlines the opportunity in the scientific community to create a research thrust aimed at developing a fundamental understanding of electron-driven processes in aqueous systems. Successful research programs in radiation chemistry and condensed-phase chemical physics provide the foundation to build such an effort