Description
LVEM 25 ELECTRON MICROSCOPE
The LVEM 25 is a unique investigative tool, which combines transmission TEM and STEM observation modes. Substantially lower accelerating voltages (ranging from 25 kV to 10 kV) than conventional TEM (typically 80–200 kV) provide substantially improved contrast on light elements with conventionally prepared samples.
Key benefits
- Low accelerating voltage (25 kV) high contrast
- 2 imaging modes available: TEM and STEM
- Small footprint
- No special facilities requirements: no need for dark room, no cooling water, no special power, etc.
Technologies & innovations
The LVEM 25 has an architecture that differs from traditional models. It can be installed in a lab, on a desktop or benchtop; almost anywhere electron imaging is needed. Ownership and maintenance of this system are greatly simplified.
Main characteristics
Field Emission Gun
- Uniquely designed Schottky type FEG (field emission gun)
- Very high brightness and spatial coherence,
- Lifetime: several thousand hours.
Ion Getter pumping: clean vacuum, clean column, clean images
- Inherently dry, vibration-free
- Very high vacuum levels
- Avoid all contamination in the sample space stable imaging conditions and no artefacts
Permanent magnet lenses
- No cooling needed.
Transmission Electron Microscopy: inline, two-stage optics platform
- Electron optics: initial stages of magnification (on YAG scintillator screen)
- Light optics: further magnify the initial image from the YAG screen
- Digital Imaging: by use of a Peltier cooled CCD camera with 2048×2048 pixels
Specifications
LVEM 25 Electron Microscope
Specifications
OPERATION | |||
Specimen size | standard ∅ 3.05 mm grids | ||
Time for sample change | approx. 3 min | ||
IMAGING MODES | |||
TEM | |||
Accelerating voltage (nominal) | 25 kV | ||
Resolving power | 1.0 nm | ||
Total magnification* | 3,400 – 1,300,000x | ||
Magnification in low mag regime* | 1,500x | ||
Field of view | 100 – 0.25 µm | ||
Field of view in low mag regime | 250 µm | ||
Focal length | 1.34 mm | ||
CS (spherical aberration coef) | 1.03 mm | ||
CC (chromatic aberration coef) | 1.05 mm | ||
αtheor (theoretical aperture angle) | 1.2 x 10-2 rad | ||
*valid for image on display at binning 2×2 | |||
ELECTRON DIFFRACTION | |||
Probe size | 500 – 8,000 nm | ||
Camera length (binning 2×2) | 2,000 – 5,000 pixels | ||
Camera constant (binning 2×2) | 17 – 40 nm pixels | ||
STEM 15 | |||
Accelerating voltage (nominal) | 15 kV | ||
Resolution | 1.3 nm | ||
Maximum magnification | 750,000x | ||
Maximum field of view | 80 µm | ||
Focal length | 0.95 mm | ||
CS (spherical aberration coef) | 0.80 mm | ||
CC (chromatic aberration coef) | 0.85 mm | ||
αtheor (theoretical aperture angle) | 1.4 x 10-2 rad | ||
STEM 10 | |||
Accelerating voltage (nominal) | 10 kV | ||
Resolution | 1.0 nm | ||
Maximum magnification | 940,000x | ||
Maximum field of view | 105 µm | ||
Focal length | 0.75 mm | ||
CS (spherical aberration coef) | 0.64 mm | ||
CC (chromatic aberration coef) | 0.72 mm | ||
αtheor (theoretical aperture angle) | 1.6 x 10-2 rad | ||
TEM IMAGE CAPTURE | |||
Camera | ANDOR Zyla sCMOS | ||
Sensor size | 2,560 x 2,160 pixels | ||
Digitalization | 16-bits | ||
Pixel size | 6.5 µm | ||
Cooling | Peltier cooling | ||
SCAN IMAGE CAPTURE | |||
Monitor | 512 x 512, 1024 x 1024, 2048 x 2048 | ||
Digitalization | 8-bits | ||
ELECTRON OPTICS | |||
CONDENSER LENS | magnetostatic & electrostatic | ||
The smallest illuminated area | 500 nm | ||
Condenser apertures | Ø 50, 30 µm | ||
OBJECTIVE LENS | magnetostatic | ||
Objective aperture | Ø 50, 30 µm | ||
PROJECTION LENS (TEM) | electrostatic double lens | ||
ELECTRON GUN | SE Cathode ZrO/W[100] | ||
Current density | 0,3 mAsr-1 | ||
Life time | > 2,000 hours | ||
LIGHT OPTICS | |||
Objective Olympus M 40x | NA* 0.95 | ||
Objective Olympus M 20x | NA* 0.75 | ||
Objective Olympus M 4x | NA* 0.13 | ||
*numerical aperture | |||
VACUUM | |||
AIRLOCK SYSTEM | |||
Diaphragm and turbomolecular pump | 10-5 mbar | ||
OBJECT SPACE | |||
Ion getter pump | 10-8 mbar | ||
ELECTRON GUN | |||
Ion getter pump | 10-9 mbar | ||
WEIGHTS AND DIMENSIONS | |||
ELECTRON AND LIGHT OPTICS | |||
Weight | 140 kg | ||
Dimensions (w x d x h) | 630 x 600 x 1500 mm | ||
AIRLOCK PUMPING SYSTEM | |||
PFEIFFER VACUUM HICUBE80ECO | |||
Weight | 17 kg | ||
Dimensions (w x d x h) | 300 x 300 x 340 mm | ||
CONTROL ELECTRONICS | |||
Weight | 50 kg | ||
Dimensions (w x d x h) | 550 x 600 x 590 mm | ||
MAIN CONNECTION | |||
Voltage / frequency | 95 – 240V / 48 – 63 Hz | ||
POWER CONSUMPTION | |||
Control electronics in standby* | 60 VA | ||
Control electronics | 350 VA | ||
Including airlock pumping system | 600 VA | ||
Camera | 60 VA | ||
PC and monitors | approx. 350 VA | ||
No cooling water for the microscope operation is required | |||
*ion getter pump only |