Twisted Laser Light Can Tell Mirror-Image Molecules Apart

Topic: Chemistry

Scientists from India have developed a new way to tell mirror-image molecules apart using twisted laser light. This breakthrough could lead to better medicines and understanding of living systems.

Many molecules come in two forms that are like left and right hands. These molecular twins can behave differently, especially in living things and medicines. Researchers wanted to find a way to tell these enantiomers (mirror-image molecules) apart.

Imagine a screw and a nut. A right-handed screw fits a right-handed thread, while a left-handed screw doesn't. Scientists from the Tata Institute of Fundamental Research, Indian Institute of Technology Mumbai, and Indian Institute of Technology Hyderabad created light that twists as it moves forward. This twisted light interacts differently with molecules depending on their handedness.

The team used ultrashort laser pulses to break gaseous samples of R- or S-Camphor into charged fragments. They then examined these fragments using a time-of-flight mass spectrometer. By comparing the fragment counts, they could tell which mirror-image form was present.

This new technique is simpler and more sensitive than traditional methods for detecting chirality. It can identify molecular handedness directly through ion signals without complicated measurements.

Why It Matters

Understanding how molecules behave in different forms can lead to better medicines and treatments for diseases. This breakthrough could also help scientists develop new technologies and materials.

Key Facts

• Scientists from India have developed a new way to tell mirror-image molecules apart using twisted laser light.
• The team used ultrashort laser pulses to break gaseous samples of R- or S-Camphor into charged fragments.
• They examined these fragments using a time-of-flight mass spectrometer and compared the fragment counts to determine which mirror-image form was present.
• This new technique is simpler and more sensitive than traditional methods for detecting chirality.
• The research was published in Science Advances on June 5, 2026.

Key Terms

Enantiomers

Mirror-image molecules that can behave differently.

Orbital Angular Momentum (OAM)

A property of light that can be used to interact with molecules in a specific way.

Implications

Understanding how molecules behave in different forms can lead to better medicines and treatments for diseases. This breakthrough could also help scientists develop new technologies and materials.