1. X-ray multiphoton-induced Coulomb explosion images complex single molecules | Nature Physics
- Author: www.nature.com
- Date Submitted: 09/30/2021 05:45 AM
- Average star voting: (4.99/5 stars and 13314 reviews)
- Summary: Following structural dynamics in real time is a fundamental goal towards a better understanding of chemical reactions. Recording snapshots of individual molecules with ultrashort exposure times is a key ingredient towards this goal, as atoms move on femtosecond (10−15 s) timescales. For condensed-phase samples, ultrafast, atomically resolved structure determination has been demonstrated using X-ray and electron diffraction. Pioneering experiments have also started addressing gaseous samples. However, they face the problem of low target densities, low scattering cross sections and random spatial orientation of the molecules. Therefore, obtaining images of entire, isolated molecules capturing all constituents, including hydrogen atoms, remains challenging. Here we demonstrate that intense femtosecond pulses from an X-ray free-electron laser trigger rapid and complete Coulomb explosions of 2-iodopyridine and 2-iodopyrazine molecules. We obtain intriguingly clear momentum images depicting ten or eleven atoms, including all the hydrogens, and thus overcome a so-far impregnable barrier for complete Coulomb explosion imaging—its limitation on molecules consisting of three to five atoms. In combination with state-of-the-art multi-coincidence techniques and elaborate theoretical modelling, this allows tracing ultrafast hydrogen emission and obtaining information on the result of intramolecular electron rearrangement. Our work represents an important step towards imaging femtosecond chemistry via Coulomb explosion. Visualizing the structural dynamics of isolated molecules would help to understand chemical reactions, but this is difficult for complex structures. Intense femtosecond X-ray pulses allow the full imaging of exploding photoionized molecules, in this case, with eleven atoms.
- Match with the search results: Feb 21, 2022 … Therefore, obtaining images of entire, isolated molecules … X-ray multiphoton-induced Coulomb explosion images complex single molecules.
2. Ukraine war: What do satellite images of the Kerch Bridge explosion tell us about the cause of the blast?
- Author: news.sky.com
- Date Submitted: 11/09/2019 04:20 PM
- Average star voting: (4.47/5 stars and 29520 reviews)
- Summary: The damage to a key bridge between Russia and Crimea is visible from space. The Kremlin has accused Ukraine of “terrorist action” and says it has carried out retaliatory strikes.
- Match with the search results: Oct 10, 2022 … A huge plume of smoke and flames can be seen in satellite images captured … Russia to Crimea was damaged in an explosion on Saturday.
3. Scientists Release Image of Gas Cloud from Star’s Explosion
- Author: learningenglish.voanews.com
- Date Submitted: 08/30/2021 08:58 AM
- Average star voting: (4.32/5 stars and 12620 reviews)
- Summary: The European Southern Observatory on Monday released an image of colorful clouds of gas created by the explosion of a huge star long ago.
- Match with the search results: Nov 3, 2022 … The European Southern Observatory on Monday released an image of colorful clouds of gas created by the explosion of a huge star long ago.
4. New clue unlocks mystery of Halifax Explosion photo | CBC News
- Author: www.cbc.ca
- Date Submitted: 09/26/2021 05:45 AM
- Average star voting: (4.25/5 stars and 33600 reviews)
- Summary: A surprise twist in the investigation into a new, nightmarish image of the Halifax Explosion has found the exact spot the photo was taken.
- Match with the search results: Jul 29, 2020 … A surprise twist in the investigation into a new, nightmarish image of the Halifax Explosion has found the exact spot the photo was taken.