LVEM5 TECHNOLOGY AND DESIGN
Benchtop Design: Convenient imaging where you need it most
The LVEM5 has an architecture that departs from traditional models. The benchtop design alone is a significant architecture & footprint departure from the classical TEM design. The LVEM5 is approximately 90% smaller than classical electron microscopes. In contrast to classical architecture, the electron optic column is very short, making up only ~ 50% of the LVEM5's tiny height. This means that the LVEM5 can be installed in a lab, on a desktop or benchtop; almost anywhere electron imaging is needed.
Low-Voltage Field Emission Gun: High brightness and high contrast
The electron source determines in large measure the parameters of the electron microscope. The uniquely-designed Schottky type field emission gun employed by the LVEM5 has very high brightness and spatial coherency.
Permanent magnet lenses: Cooling not required
In another industry first, the LVEM5 is designed to operate without any cooling. With conventional electron microscopes active cooling is required to remove considerable heat generated by electric current circulating in the electromagnetic lenses. Uniquely designed permanent magnet lenses used in the LVEM5 remove any need for cooling of its components.
Ion Getter Pumping: Clean vacuum, clean column, clean images
Ion pumps are inherently dry, vibration-free and achieve very high vacuum levels. They use no oil as do mechanical rotary-pumps and diffusion pumps. By making use of specially designed Ion Getter Pumps, the LVEM5 avoids all contamination in the sample space, resulting in stable imaging conditions and absence of artifacts.
Transmission Electron Microscopy: Inline, two stage optics platform
Electron optics provide the initial stages of magnification. The FEG cathode is at the base of the microscope. The electron beam is then shaped by the condenser and objective lenses as electrons travel upwards through the sample. They continue towards the YAG scintillator screen for formation of the initial image. High spatial resolution on the YAG screen enables using high light-optical magnification in a unique two stage magnification system.
Light optics that are stable and reliable further magnify the initial image on the YAG screen. There is highly efficient light transport from the luminescent screen into the light optics. A selection of different light objectives allow for a wide range of magnifications.
Image capture is by means of digitial camera mounted on the top of the LVEM5. On base models, a CCD camera is used, and on TEM BOOST equipped models, a Scientific CMOS. The cameras are optimized for low-light, high dynamic range image capture. The magnified image from the light optics is captured for subsequent viewing and analysis.
Scanning Electron Microscopy: Integrated detector for multiple modes
In yet another industry first, a backscattered electron detector has been directly incorporated into an electron optics column that was originally designed for transmission electron microscopy alone, enabling scanning electron microscopy to be performed in parallel.
In SEM mode, the electron beam is focused into a narrow spot, and then scanned repeatedly over the sample. Electrons are elastically scattered at high angles back in the direction of the electron source. These back-scattered electrons are collected by an annular solid-state detector – separately for each scanned point. The spatial intensity distribution of the backscattered electrons is used to form the final image in the PC software.
The combination of selected spot sizes and optimized working distances allow for a wide range of magnifications. The small working distance creates high spatial resolution and a segmented semi-annular detector provides the choices of material of relief contrast.
Ingenious design: We worked hard, so you don’t have to
The operating console allows a great degree of comfort as the operator is free to operate the system and observe results via the monitor, away from the microscope body. Feedback is provided directly on the control panel as well as through the LVEM5’s comprehensive software.
The LVEM5 is so remarkably simple that anyone can use it. All in all, the LVEM5 marks a radical and refreshing departure from the classical electron microscope architecture, a departure that is welcomed by the ambitious researcher.