The main advantage of using an Energy Beam Sciences thin film aperture is that it heats up sufficiently in the path of the electron beam to prevent deposition of contaminants. In addition to the self cleaning characteristics of gold foil apertures, our exclusive manufacturing process ensures a single, round, well-centered hole is produced each time.
In practical terms, this means working with a microscope for many weeks without noticeable change in astigmatism, without risk of contamination by frequent air admittance into the column and without the frequent chemical or physical cleaning required with conventional drilled apertures.