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In the twenty years since Ray Land and Erik Meyer published their first paper on Threshold Concepts, there has been a steady stream of papers mulling over their original suggestions that learning, far from proceeding in an orderly fashion, is instead a process of struggle – perhaps alienation and confusion – that puts students in a troublesome liminal ‘in-between’ state. As their understanding develops, liminality gives way to transformational insight whereby a whole field of study comes, often quite abruptly, into focus. There is a gain but often also a loss: in this new world, old certainties, assumptions and even aspects of our identity can be left by the wayside. Threshold Concepts in the Moment is the sixth collection in the series on the subject of Threshold Concepts, following the 8th Biennial Conference held in 2021, anchored at London’s UCL but running online across the world. Its contributors, who range from ‘old hands’ to new members of the community finding their feet, mull over the insights of the threshold concepts framework in higher education, scrutinise their own fields of study, explore the implications of liminality for pedagogy and becoming professional practitioners, and consider the broad implications for pedagogy of factoring in the troublesomeness of knowledge and learning.
The specification of standards in higher education has long been the subject of international debate. This text covers the rationales, operational issues and perspectives on benchmarking and standards from international viewpoints.
Jonelle Harvey's book outlines two related experimental techniques, threshold photoelectron spectroscopy and threshold photoelectron photoion coincidence techniques, which are utilised to investigate small halogenated molecules. All the experiments were conducted at the vacuum ultraviolet beamline of the Swiss Light Source, a synchrotron photon source, which has the advantage over popular laser photon-sources of extreme ease of tunability. Three studies are presented which combine experimental and computational ab initio approaches: studying the fast dissociations of halogenated methanes in order to construct a self-consistent thermochemical network; investigating the fragmentations of fluoroethenes from timebombs, which break apart very slowly but explosively, to fast dissociators; and uncovering how vital conical interactions underpin both the results of photoelectron spectra and dissociation patterns. The details included in this thesis are useful for researchers working in the same field and those readers wishing to obtain a solid introduction into the types of systems encountered in threshold photoelectron photoion coincidence spectroscopy.
Volume II continues with reaction rates, the concept of elementary intramolecular vibrational-energy redistribution (IVR) and the phenomena of rotational coherence which has become a powerful tool for the determination of molecular structure via time resolution. The second volume ends with an extensive list of references, according to topics, based on work by Professor Zewail and his group at Caltech. These collected works by Professor Zewail will certainly be indispensable to both experts and beginners in the field. The author is known for his clarity and for his creative and systematic contributions. These volumes will be of interest and should prove useful to chemists, biologists and physicists. As noted by Professor J. Manz (Berlin) and Professor A.W. Castleman, Jr.