Catálogo de publicaciones - revistas

<jats:title>Two-part formation of the Solar System</jats:title> <jats:p> Measurements of meteorites have shown that the inner and outer Solar System formed from two distinct reservoirs of material. Existing models have proposed that these were split by Jupiter forming first, which would open a gap in the protoplanetary disc. Lichtenberg <jats:italic>et al.</jats:italic> instead argue that the snow line, the boundary between regions containing water vapor and solid ice, migrated first outward and then inward, forming two separate populations of planetesimals. Those planetesimals then grew through collisions to form the planets. Their simulation of this model explains the meteorite data and is consistent with astronomical observations of protoplanetary disks around other stars. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6527" page="365" related-article-type="in-this-issue" vol="371">365</jats:related-article> </jats:p>

<jats:title>Watching a phase transition unfold</jats:title> <jats:p> The layered material 1 <jats:italic>T</jats:italic> -polytype of tantalum disulfide has several intricate charge-ordered phases. How exactly one phase transitions into another is tricky to observe directly with current technologies. Danz <jats:italic>et al.</jats:italic> used pump-probe ultrafast dark-field electron microscopy to follow such a transition with fine spatial and temporal resolution (see the Perspective by Kogar). To achieve that goal, they shaped the electron beam used as the probe to bring out the features peculiar to the transition. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6527" page="371" related-article-type="in-this-issue" vol="371">371</jats:related-article> ; see also p. <jats:related-article issue="6527" page="341" related-article-type="in-this-issue" vol="371">341</jats:related-article> </jats:p>

<jats:title>Modeling single-atom reactivity</jats:title> <jats:p> Noble metals often perform best for demanding reactions such as oxygen reduction, an effect often explained by the position of their d-band. One way to minimize the cost of noble metals is to disperse them as single atoms. To model the reactivity of supported single atoms, Hulva <jats:italic>et al.</jats:italic> evaporated different transition metals such as nickel, silver, and iridium on an Fe <jats:sub>3</jats:sub> O <jats:sub>4</jats:sub> (001) support. Single atoms adsorbed in the same twofold site between underlying rows of surface iron atoms. In studies of CO adsorption as a proxy for reactivity, the d-band was strongly affected by the charge transfer to the support and CO-induced structural changes. These effects can weaken the adsorption energy compared with the expected values based on electronic structure alone. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article issue="6527" page="375" related-article-type="in-this-issue" vol="371">375</jats:related-article> </jats:p>