Topic: Physics

Scientists filmed atoms moving before exploding, revealing a hidden driver of radiation damage. They found that atoms move in a roaming-like pattern, affecting how radiation damages cells.

What happens when high-energy radiation hits living cells? It can disturb atoms and molecules, causing them to break down and potentially destroy important biomolecules. To understand this process better, scientists studied a specific type of radiation-driven decay called electron-transfer-mediated decay (ETMD). In ETMD, radiation excites an atom, which then stabilizes itself by pulling an electron from a nearby atom, releasing energy that ionizes another neighbor.

To investigate this process, researchers used a simple model system made of one neon atom weakly bound to two krypton atoms. They knocked out an electron from the neon atom using soft X-rays and followed how the system evolved for up to a picosecond before the decay occurred. During this time, an electron was transferred between atoms, and a low-energy electron was emitted.

The researchers used an advanced microscope at the synchrotron facilities BESSY II and PETRA III to reconstruct the exact arrangement of the atoms at the moment the decay happened. They paired these measurements with detailed simulations that tracked thousands of possible atomic pathways and calculated how likely decay was along each one.

Why It Matters

Understanding ETMD is important because it produces low-energy electrons, which can trigger chemical damage in liquids and biological materials. This knowledge can help us better model radiation damage and develop ways to reduce its effects.

Key Facts

• Scientists filmed atoms moving before exploding, revealing a hidden driver of radiation damage.
• ETMD is a type of radiation-driven decay that occurs when an atom stabilizes itself by pulling an electron from a nearby atom.
• The researchers used a simple model system made of one neon atom weakly bound to two krypton atoms to study ETMD.
• The team found that the atoms moved in a roaming-like pattern, affecting how radiation damages cells.
• Understanding ETMD is important for accurately modeling radiation damage and developing ways to reduce its effects.

Key Terms

Electron-transfer-mediated decay

A type of radiation-driven decay where an atom stabilizes itself by pulling an electron from a nearby atom.

Implications

Understanding ETMD is important because it produces low-energy electrons, which can trigger chemical damage in liquids and biological materials. This knowledge can help us better model radiation damage and develop ways to reduce its effects.