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Updated: Mar 9, 2026

Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Molecular Fountain.

Cunfeng Cheng¹, Aernout P P van der Poel¹, Paul Jansen¹

¹LaserLaB, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.

Physical Review Letters

|December 31, 2016

Summary

This summary is machine-generated.

Scientists created the first molecular fountain, enabling longer interrogation times for molecules. This breakthrough allows for highly precise measurements, advancing fundamental physics research.

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Area of Science:

Atomic, Molecular, and Optical Physics
Quantum Metrology
Fundamental Physics

Background:

Spectroscopic and interferometric resolution is limited by particle interrogation time.
Achieving longer interrogation times is crucial for enhancing measurement precision.

Purpose of the Study:

To demonstrate the first molecular fountain for extended molecular interrogation.
To enable sub-Hertz precision measurements in molecular systems.
To facilitate stringent tests of fundamental physics theories.

Main Methods:

Utilized electric fields to decelerate and cool ammonia molecules.
Launched molecules upwards (1.4–1.9 m/s) for free fall under gravity.
Employed quadrupole lenses and bunching elements for beam shaping, focusing, and precise velocity/position control.

Main Results:

Achieved molecular free-fall times up to 266 milliseconds.
Created beams with large position spread and small velocity spread (<10 μK transverse, <1 μK longitudinal).
Demonstrated strong focusing of molecules in the detection region.

Conclusions:

The molecular fountain enables unprecedented interrogation times for molecules.
This technique paves the way for sub-Hertz precision measurements.
The method supports advanced research in fundamental physics and metrology.