Categories: Chemistry

Scientists Use “Electron Camera” to Image Molecules During Photochemical Reaction

Scientists have used a high-speed “electron camera” and quantum simulations to capture the photochemical “transition state” of a molecule’s atoms during a ring-opening reaction in α-terpinene. This marks the first time scientists have precisely tracked molecular structure through a photochemical ring-opening reaction, which occurs when light energy is absorbed by a substance’s molecules. The findings, published in Nature Communications, could help us further understand similar reactions with vital roles in chemistry and biology, such as vitamin D production in our bodies.

Methodology and Results

Transition states generally occur in chemical reactions triggered by heat, and are a point of no return for molecules involved in a chemical reaction. As the molecules gain energy to transform into new molecules, they rearrange themselves into a fleeting configuration. Until now, no method existed that was sensitive enough to capture these fleeting states, which last for only millionths of a billionth of second.

At SLAC’s MeV-UED instrument for ultrafast electron diffraction, the researchers sent a high-energy electron beam through a gas to measure distances between the atoms within the molecules in the gas. By taking snapshots of these distances at different intervals after an initial laser flash, scientists were able to create a stop-motion movie of the light-induced atomic rearrangements in the molecules.

The researchers discovered that some parts of the atomic rearrangements happen earlier than others, which provides an explanation for why the specific stereochemistry is created by the reaction. This is important for understanding the quantum mechanics underpinning photochemistry. Comparing the experimental results with quantum simulations of the reaction allowed the team to get a highly accurate picture of how molecules behave and benchmark the predictive power of theoretical and computational methods.

Co-author and SLAC scientist Thomas Wolf said that transition states tell us a lot about how and why reactions happen. Investigating critical configurations in photochemical reactions could lead to a better understanding of reactions with key roles in chemistry and biology. By using diffraction techniques, scientists can now look at specific characteristics of such reactions.

In a previous study of a related reaction, MeV-UED allowed the team to capture the coordinated dance between electrons and nuclei, providing the first direct confirmation of a half-century-old set of rules about the final product’s stereochemistry. With this new research, scientists can start answering questions about why and how reactions happen, which is incredibly exciting for Wolf.

Overall, this research shows that the use of high-speed “electron cameras” and quantum simulations can help us better understand the behavior of molecules during chemical reactions triggered by light. This understanding could lead to further advancements in chemistry and biology, including the production of important substances like vitamin D.

adam1

Share
Published by
adam1

Recent Posts

Revolutionizing Oxygen Evolution Reactions: The Promise of Doped Cobalt Catalysts

Recent advancements in electrocatalysis have opened up exciting avenues for energy conversion technologies. A multidisciplinary…

4 hours ago

The Cosmic Symphony: Unraveling the Birth and Death of Stars

Stars are the luminous beacons of the universe, embodying both beauty and complexity. Their life…

5 hours ago

The Future of Antarctica’s Ice Sheet: Warnings from Recent Research

As the climate crisis continues to escalate, a groundbreaking study led by a team of…

7 hours ago

Triumph of Innovation: Belgian Team Shines in South Africa’s Solar Car Challenge

In a remarkable testament to human ingenuity and the potential of renewable energy, a Belgian…

7 hours ago

The Expansion of Memory: Beyond the Brain

The human understanding of memory has long been confined to the realms of the brain,…

13 hours ago

The Enigmatic Dance of the Sun: Unraveling the Mysteries of Solar Behavior

The Sun has captivated humanity for millennia, serving not only as the source of light…

20 hours ago

This website uses cookies.