Yale Researchers Detect Atomic Collisions With Nanosphere
Scientists used a levitated silica nanosphere to measure microscopic gas collisions and pressure changes.
Updated on Oct. 23, 2026 in Physics
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Researchers at Yale University have successfully used a levitated silica nanosphere to detect individual atomic collisions. By monitoring the motion of the trapped particle, the team inferred gas pressure inside a vacuum chamber.
Why it matters
This experiment provides a new method for understanding background collisions between nanoparticles and residual gases. The findings offer a potential pathway for developing sensitive new background pressure sensors.
The study utilized a silica nanosphere with a 50 nm radius to analyze seven pressure points across krypton, xenon, and sulphur hexafluoride. Researchers monitored the particle by measuring the phase of backscattered laser light during simple harmonic motion.
The players
Yale University
This private Ivy League research university in New Haven, Connecticut, served as the primary site for the nanoparticle experiment.
Lawrence Berkeley National Laboratory
Operated by the University of California, this national laboratory provided contributing research to the study.
The details
Collisions from gas atoms caused small, detectable perturbations to the nanosphere's harmonic motion without knocking the particle from the laser trap. The team conducted the experiment at pressures up to 1.5 nbar to validate the detection technique.
Timeline
The research was published in Physical Review Letters in 2026.
The Big Picture
This work advances the development of background pressure sensors by enabling high-precision detection of individual atomic impacts. It marks a paradigm shift from traditional macroscopic sensing toward leveraging levitated optomechanics for extreme sensitivity.
This detection technique could lead to the development of ultra-sensitive pressure sensors for industrial and scientific applications. Future refinements may eventually assist in high-precision physics experiments, such as reconstructing the momentum of emitted neutrinos.
The takeaway
The study demonstrates that nanoparticles can function as highly effective probes for atomic-scale interactions. Future research will explore doping these nanospheres with isotopes to further expand their utility in fundamental physics.
Further reading
For more information on current laboratory studies, visit Physics.
Source note: This article includes information reported by Physics World.
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