Laser Lasso for Stable Molecules ⚡ экспресс
Researchers have created a magneto-optical trap (a device that holds particles with lasers and magnetic fields) for aluminum fluoride (AlF) molecules for the first time. Unlike previously trapped chemically reactive molecules, AlF is stable and has a different type of electronic ground state (^1Σ^+). The trap operated on a strong transition at a wavelength of about 227.5 nm; approximately 60,000 molecules were trapped at rotational level J=1 and thousands at levels J=2 and J=3, with no fundamental limitations for higher levels. This achievement is similar to the introduction of alkaline-earth atoms into cold atom physics and paves the way for high-precision spectroscopy and ultra-precise cooling.
Physicists have created a spectroscopic trap—a lasso of ultraviolet laser light and magnetic field—to catch aluminum fluoride molecules. These molecules, resembling the sturdiest dumbbells, previously evaded capture: unlike their fragile cousins, they remained elusive. The laser beam doesn't just grip them; it saps their energy, slowing their motion to temperatures mere thousandths of a degree above absolute zero. Such ultracold gas opens the door to precision light measurement and testing the Standard Model of particle physics.
AlF has an energy transition—a stubborn knot that resists brute force. But fine-tuning the laser, like a deft wrist flick, loosens it. This promises atomic clocks of record accuracy. Further cooling will make the molecules stop being mere dumbbells: they’ll start to interfere like waves—quantum world, unadorned.
🎯 Aluminum fluoride is a key component in making tough ceramics. But when cooled to near absolute zero, it becomes a perfect quantum object—as if an ordinary stone suddenly gained the properties of a superconductor.
🎬 The fantastical 'tractor beam' captures ships; here, lasers and magnetic fields serve as a lasso for molecules.