A low x-ray background low temperature specimen stage for biological microanalysis in the TEM

Area of Science:

• Materials Science
• Analytical Chemistry
• Microscopy

Background:

• Existing specimen stages for JEOL JEM 100 and 200 series transmission electron microscopes have limitations in managing extraneous instrumental contributions to X-ray spectra.
• Previous designs focused on minimizing and quantifying these contributions at room temperature.

Purpose of the Study:

• To develop an advanced specimen stage for transmission electron microscopy (TEM) that operates at low temperatures (down to 100 K).
• To minimize the loss of organic material in specimens caused by electron irradiation during TEM analysis.
• To further reduce the X-ray background noise from the instrument itself.

Main Methods:

• Development of a novel side-entry specimen stage compatible with JEOL JEM 100 and 200 series TEMs.
• Integration of a cooling system capable of reaching temperatures as low as 100 Kelvin.
• Design and implementation of a new anticontaminator to ensure a clean, low-temperature specimen environment.

Main Results:

• The new specimen stage effectively maintains specimens at low temperatures (down to 100 K).
• The stage design significantly minimizes the loss of organic material under electron irradiation.
• A substantial reduction in extraneous X-ray background from the instrument has been achieved.

Conclusions:

• The developed low-temperature specimen stage enhances the capability of TEM for analyzing sensitive organic materials.
• This advancement allows for more accurate X-ray spectral analysis by reducing instrumental artifacts.
• The new anticontaminator contributes to a cleaner and more stable low-temperature environment for TEM specimen analysis.