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Watching Electron Dynamics Shape Chemical Reactions

Scientists have used ultrashort x-ray pulses to directly observe the motion of electrons driving a chemical reaction.

A chemical reaction occurs when chemical bonds break and new ones form. These bonds hold atoms together within molecules and are governed by the atoms’ outermost electrons. The motion of these so-called valence electrons dictates how a reaction starts and determines its final products. For decades, chemists have envisioned the possibility of watching such electron movement in real time, capturing a movie of valence electrons as bonds break and form. Now Ian Gabalski at Stanford University and his colleagues have brought this dream closer to reality [1]. They have observed valence-electron motion occurring within a few hundred femtoseconds—where one femtosecond is a millionth of a billionth of a second. This feat was accomplished using ultrashort, high-energy x-ray pulses produced at SLAC National Accelerator Laboratory in California. The team’s findings provide an intuitive view of how electron dynamics influence chemical reactions.

Directly observing electron motion during chemical reactions presents two main challenges. First, it requires an imaging technique that can map the spatial distribution of electrons, known as the electron density. This distribution spans only a few tenths of a nanometer, demanding extremely high spatial resolution. Second, the task needs ultrahigh temporal resolution, because electron movement occurs on a timescale of femtoseconds or even attoseconds—thousandths of a femtosecond. Capturing such rapid motion requires the sample to be subjected to light pulses that are short enough to effectively freeze electron dynamics in time, similarly to using a high-speed camera to capture the fluttering wings of a hummingbird.

Scattered Spider Hacker Gets 10 Years, $13M Restitution for SIM Swapping Crypto Theft

A 20-year-old member of the notorious cybercrime gang known as Scattered Spider has been sentenced to ten years in prison in the U.S. in connection with a series of major hacks and cryptocurrency thefts.

Noah Michael Urban pleaded guilty to charges related to wire fraud and aggravated identity theft back in April 2025. News of Urban’s sentencing was reported by Bloomberg and Jacksonville news outlet News4JAX.

In addition, 120 months in federal prison, Urban faces an additional three years of supervised release and has been ordered to pay $13 million in restitution to victims. In a statement shared with security journalist Brian Krebs, Urban called the sentence unjust.

North Korea Uses GitHub in Diplomat Cyber Attacks as IT Worker Scheme Hits 320+ Firms

“The attackers leveraged GitHub, typically known as a legitimate developer platform, as a covert command-and-control channel,” Trellix researchers Pham Duy Phuc and Alex Lanstein said.

The infection chains have been observed to rely on trusted cloud storage solutions like Dropbox and Daum Cloud, an online service from South Korean internet conglomerate Kakao Corporation, in order to deliver a variant of an open-source remote access trojan called Xeno RAT that grants the threat actors to take control of compromised systems.

The campaign is assessed to be the work of a North Korean hacking group called Kimsuky, which was recently linked to phishing attacks that employ GitHub as a stager for an Xeno RAT known as MoonPeak. Despite the infrastructure and tactical overlaps, there are indications that the phishing attacks match China-based operatives.

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