The electron beam of a microscope usually flies through emptiness, like a courier on an empty highway. Any air molecule is a bump that makes it bounce and lose direction. So before, to examine a sample, you had to freeze it, dry it, or coat it with metal—and still you could only look in a vacuum. But rust, glass melting, catalyst breathing, and mite legs moving all happen in air, at pressures and temperatures that are lethal to a regular microscope.
The engineers reworked the entire beam path, not just one component. Previously, pressure was reduced in stages, but each stage was bulky. Now a front module with vortex channels compresses the pressure drop into a few millimeters: the beam dives from near-atmospheric pressure into high vacuum, like a winding mountain road with sharp turns. The detector that catches backscattered electrons was also replaced: a needle-shaped electrode sparked at high pressure, while a flat one works quietly. Sample heating is handled by three lasers through a sapphire prism—they heat locally without heating the whole chamber.
Initial experiments showed the system holds both extremes at once. A glass mixture of BaSO₄–SiO₂ was heated to 1400 °C at a pressure of 6000 Pa, and they saw it start to soften at 1100 °C and flow as a continuous liquid by 1400 °C. No charging, no interference. A live mite at 20,000 Pa moved its legs while the chamber was humid; when water was pumped down to 100 Pa, it froze and began to dry out. All of this was recorded in real time.
Previously, a researcher had to choose: either a hot sample in vacuum, or a wet one at room temperature. Now the choice is gone. You can keep a catalyst in a flow of ethylene and oxygen at working temperature and simultaneously watch how its particles change, while a mass spectrometer nearby captures signals of hydrogen, water, and carbon dioxide. It's like listening to the breathing of a chemical reaction without taking your eyes off its face.
The courier who only drove on an empty highway now travels on a regular road—with dust, rain, and heat. And for the first time, we can see what happens on that road without stopping the traffic.
A live mite under an electron beam is not science fiction but a routine demonstration: at 20,000 Pa it wiggled its legs until humidity dropped to 100 Pa. And the pressure difference from the sample chamber to the electron gun spans 14 orders of magnitude, like from the bottom of the Mariana Trench to open space.