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On the cover: About 100,000 years ago, Diverse Homo species coexisted with our own species Homo sapiens. The Harbin cranium, or the Dragon Man, is one of the best preserved Middle Pleistocene human fossils. The cranium has a large cranial capacity falling in the range of modern humans, but is combined with a mosaic of primitive and derived characters. Phylogenetic analyses suggest that the diversification of the Homo genus had a much more distant past than previously presumed. The Harbin cranium and some other Middle Pleistocene human fossils from China represent the third human lineage that is the sister group of H. sapiens and has closer relationships with H. sapiens than Neanderthals with H. sapiens. Multiple Homo lineages in Africa, Asia and Europe probably had a strong capability for long-distance dispersal, but remained in relatively small and isolated populations. Diverse palaeoenvironments in Asia may have produced a varied biogeographic sink for human evolution.
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Position: Home > issue > August 28, 2021 Volume 2, Issue 3
Reactive Resonance and the Role of Electron Angular Momentum
Category:   Commentary   Download:  PDF  Figure  Endnote
Author: Mingfei Zhou, Kopin Liu

b2.jpg

Schematic of experimental setup (left panel)

Understanding the reaction mechanism at the atomic and molecular level is a central task of chemistry. Within the Born-Oppenheimer approximation, a chemical reaction is envisioned as nuclear dynamics evolving from reactants to products on a potential energy surface (PES). To reveal the detailed mechanistic origin of such an old bond-breaking and new bond-forming process, a measurement of state-to-state differential cross-sections (DCSs) is essential. Its fine structure often serves as a fingerprint to identify quantum dynamics phenomena in a bimolecular reactive encounter. Observation of these fine structures is, however, difficult, because the interference feature may appear in the state-to-state DCSs only with very high angular resolution.





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