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Controlling Isomer Population Using a Dual-Oscillator Infrared Free-Electron Laser
América Y Torres-Boy1, Anoushka Ghosh1, Myles B T Osenton1
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
Physical Review Letters
|July 23, 2026
Summary
Researchers precisely controlled ion populations within superfluid helium nanodroplets using a synchronized dual-color infrared free-electron laser. This technique allowed for selective isomer manipulation and the recording of hidden infrared spectra for individual isomers.
Area of Science:
- Physical Chemistry
- Quantum Chemistry
- Spectroscopy
Background:
- Superfluid helium nanodroplets provide a unique environment for isolating and studying molecular ions.
- Controlling isomer populations is crucial for understanding molecular properties and reactions.
Purpose of the Study:
- To demonstrate precise control over the isomer population of ions within superfluid helium nanodroplets.
- To develop a method for recording hidden infrared spectra of individual molecular isomers.
Main Methods:
- Utilizing a dual-oscillator infrared free-electron laser with synchronized and independently tunable colors.
- Interacting a singly deuterated proton-bound dimer of dihydrogen phosphate and formate with the laser.
- Performing experiments within superfluid helium nanodroplets.
Main Results:
- Achieved precise control over the isomer population of the targeted molecular ion.
- Successfully recorded one-color hidden-infrared spectra of individual isomers.
- Demonstrated the capability to tune laser frequencies independently over a wide range.
Conclusions:
- The two-color free-electron laser approach offers a powerful tool for isomer population control in nanodroplets.
- This method enables detailed spectroscopic characterization of individual molecular isomers.
- Opens new avenues for studying isomer-specific properties and reactions in a controlled environment.
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