Low Vacuum Secondary Electron TESCAN Detector

The LVSTD is secondary electron detector specially designed for low vacuum operations. This is advantageous for beam-sensitive samples.
The Low Vacuum Secondary Electron TESCAN Detector is a unique solution developed and patented by TESCAN and specially designed for low vacuum operations. It is based on a modified Everhart-Thornley design equipped with a crystal-based scintillator. 
 

Key Features

  • True secondary electron imaging under low vacuum conditions
  • Perfect displaying of the fine surface topography
  • Good-quality investigation of non-conductive materials without special preparation
  • Fine imaging of the surface structure of materials with low atomic number
  • Compact design of the LVSTD allowing for fast and easy interfacing of any chamber manufactured by TESCAN

The new versions of the LVSTD detector


TESCAN has developed two new versions of LVSTD detector working up to 1000Pa, available as an option for VEGA microscopes with extended low vacuum mode up to 2000Pa.

Benefits and Features:

  • Improved pumping system allows using of the LVSTD up to 1000 Pa in Low Vacuum Mode. Separate detection chamber of the LVSTD is pumped down by a turbomolecular pump. The pumping efficiency of the gas from the detector chamber is increased by a rotary pump which is pre-pumped by the turbomolecular pump.
  • Increased detected signal in all three versions of the LVSTD detector.
  • Combination of LVSTD up to 1000 Pa and Water Vapor Inlet System allows observation of hydrated samples at temperatures above zero in their natural state.

 
Low Vacuum Secondary Electron TESCAN Detector
Low Vacuum Secondary Electron TESCAN Detector

Versions of LVSTD detectors offered by TESCAN

LVSTD version Condition Vacuum Microscope
LVSTD up to 500 Pa N2 up to 500 Pa SEMs with low vacuum mode up to 500 Pa
LVSTD up to 1000 Pa (N2) N2 up to 1000 Pa SEMs with extended low vacuum mode up to 2000 Pa
LVSTD up to 1000 Pa (Water Vapor) water vapor or N2 up to 1000 Pa SEMs with extended low vacuum mode up to 2000 Pa and with Water Vapor option

 

Related Application Notes

Investigation of cell spreading on bioceramic materials
In the field of current implantology, the conventional usage of titanium alloys is being replaced by ceramic materials. Bioceramics are made by sintering of the ceramic powders (e. g. zirconia or alumina powders) and they are characterized by excellent hardness and tribological properties. Zirconia ceramics are becoming prevalent among biomaterials used in dental implantology. The aim of this study was to investigate osteoblastic spreading in contact with various oxide ceramics. The spreading of the osteoblastic cells MG63 on the zirconia and alumina surfaces was observed using a MIRA3 FEG SEM in the low vacuum mode in order to evaluate the biocompatibility of these ceramic materials.
pdf – 3.4 MB