Catálogo de publicaciones - revistas

<jats:title>Watching collisions in the slow lane</jats:title> <jats:p> Quantum mechanics aims to “micromanage” the details of collisions between atoms and molecules. However, it's hard to discern all the subtleties under high-energy conditions. Vogels <jats:italic>et al.</jats:italic> slowed down two intersecting beams of helium atoms and nitric oxide (NO) molecules to a relative crawl in order to characterize the collisions precisely. The data revealed short-lived resonances that matched theoretical predictions remarkably well—a striking feat on both sides, given the challenge of accurately modeling NO's unpaired electron. The study highlights chemists' increasingly sophisticated understanding of collision dynamics. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6262" page="787" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aad2356">787</jats:related-article> </jats:p>

<jats:title>Electronic movement flashing into view</jats:title> <jats:p> Numerous chemical processes begin with ionization: the ejection of an electron from a molecule. What happens in the immediate aftermath of that event? Kraus <jats:italic>et al.</jats:italic> explored this question in iodoacetylene by detecting and analyzing the spectrum of emitted high harmonics (see the Perspective by Ueda). They traced the migration of the residual positively charged hole along the molecular axis on a time scale faster than a quadrillionth of a second. They thereby characterized the capacity of a laser field to steer the hole's motion in appropriately oriented molecules. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6262" page="790" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aab2160">790</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6262" page="740" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aad3982">740</jats:related-article> </jats:p>

<jats:title>Shaking out water's dusty origin</jats:title> <jats:p> Where did Earth's water come from? Lavas erupting on Baffin Island, Canada, tap a part of Earth's mantle isolated from convective mixing. Hallis <jats:italic>et al.</jats:italic> studied hydrogen isotopes in the lavas that help to “fingerprint” the origin of water from what could be a primordial reservoir. The isotope ratios for the Baffin Island basalt lavas suggest a pre-solar origin of water in Earth, probably delivered by adsorption onto dust grains. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6262" page="795" related-article-type="in-this-issue" vol="350" xlink:href="10.1126/science.aac4834">795</jats:related-article> </jats:p>