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Table of Contents
Summary of Contents for LEO LEO 912 OMEGA
- Page 1 Transmission Electron Microscope LEO 912 OMEGA LEO 912 Brief Manual G 34-655 e...
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Page 2: Table Of Contents
Centration of spectrometer aperture Centration of spectrometer slit aperture 1.10 Correction of imaging astigmatism 1.11 Low magnifications (LM) 1.12 Medium and high magnifications 1.13 Focusing the specimen 1.14 Photography 1.14.1 Loading and removing film 1.14.2 Exposure 1.15 Turning - OFF LEO 912 OMEGA... - Page 3 TILT SHIFT ILLUMINATION TEM SPOT CALIBRATE SPOT FOCUS M / LM BEAM A I S M D F DISPLAY D S A MODE BLANKER MODE MODE MODE DEFOCUS FOCUS BRIGHTNESS COARSE FINE STEP ILL APERTURE / SPOTSIZE OBJECTIVE LEO 912 OMEGA...
- Page 4 Description Column Electron gun Goniometer Condenser aperture Specimen change Selected area aperture Specimen holder Objective aperture Spectrometer entrance aperture Spectrometer Spectrometer slit aperture Binocular Viewing chamber Fluorescent screen LEO 912 OMEGA...
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Page 5: Microscope Operation
– The vacuum system is activated for normal operation. – Rotary pump starts, Turbo pump starts. – DOS operating system, LEO 912 program and user data are loaded from the LEO 912 OMEGA hard disk. – LEO 912 OMEGA START menu is displayed. -
Page 6: High-Voltage Selection
1.4.2 Load specimen • Place specimen rod in container. • Loosen screw with collet chuck and lift it together with holding bow off. • Insert new grids with tweezer. • Replace holding bow and tighten screw. LEO 912 OMEGA... -
Page 7: Lock-In Specimen Rod
LED STOP goes out. • Wait until LED STOP is out. • Pull specimen rod back to stop and turn it carefully through further 90°; push rod slowly into the microscopy position Insertion of specimen rod Preevacuation Preevacuation concluded Microscopy LEO 912 OMEGA... -
Page 8: Basic Alignment
Switch to SPEC with button IMAGE/SPEC in the field SPECTROMETER. – The spectrum caustic is visible on the screen. • Activate menu PARAMETER, push button CAL and then CALIBR. IM. SHIFT and CALIBR. ILL. DEFL. – The illuminating and imaging system are calibrated. LEO 912 OMEGA... -
Page 9: Alignment Of Tem- And Spot-Illumination
Focus spot with encoder SPOT FOCUS. • Move spot to index point with encoders ILL. SHIFT. • Activate the function BEAM ALIGNM. in the menu GUN. • Set spot size to 100 nm with buttons SPOT SIZE ∆ ∇ . LEO 912 OMEGA... -
Page 10: Adjustment Of Eucentric Plane
Adjustment of beam incidence SPECIAL NOTE: This adjustment step is very important for a single field condenser/objective lens. Asymmetric diffraction fringes are created by a tilted illumination. • Deactivate AIS mode in the main menu. • Select magnification 63.000x. LEO 912 OMEGA... -
Page 11: Ais Adjustment
Insert desired objective lens aperture and center it to the diffraction spot (see chapter “Objective lens aperture”). • Switch to IMAGE mode and activate AIS ADJ menu in the PARAMETER menu. • Decrease magnification by 3 steps (63.000x) LEO 912 OMEGA... -
Page 12: Centration Of Objective Lens Aperture
Insert the desired objective aperture and center it to the diffraction spot. • Switch back to IMAGE mode with button IMAGE/DIFF in the field IMAGE. Centration of spectrometer aperture • Insert entrance aperture (1st clickstop) and center it with the aperture drives to the large screen. LEO 912 OMEGA... -
Page 13: Centration Of Spectrometer Slit Aperture
– The astigmatism is compensated, if there is no privileged direction of the grain in under- and overfocus. • Switch back to SHIFT with button SHIFT/STIG in the field IMAGE. • Adjust brightness and magnification to the desired values. LEO 912 OMEGA... - Page 14 Microscope Operation Correction of imaging astigmatism Astigmatism existent Astigmatism compensated Overfocus Overfocus Near focus (grain almost disappears) Near focus (grain remains visible) Underfocus Underfocus LEO 912 OMEGA...
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Page 15: Low Magnifications (Lm)
• Adjust binocular to your eye sight and focus it on the index point of the small screen. • Move specimen detail to index point. • Switch on focus AID and push CALIBRATE in the field FOCUS. LEO 912 OMEGA... -
Page 16: Photography
• Ventilate CAM in the VACUUM menu and insert new magazine in the upper part and the film collector in the lower part of the camera chamber. • Close camera and EVAC CAM in the VACUUM menu. LEO 912 OMEGA... -
Page 17: Exposure
Push softkey EXIT and answer PROCEED? with Y. – All instrument parameters are stored on harddisk. – Start menu is shown. • Turn key switch to OFF – Turbo pump is partly ventilated with nitrogen gas. – Rotary pump is switched off. LEO 912 OMEGA... - Page 18 Telephone (1) 914 747 7700 Fax (1) 914 681 7443 E-mail 70142.504@compuserve.com Plus a worldwide network of dealers Due to a policy of continuous development, we reserve the right to change specifications without notice. © by LEO Electron Microscopy Ltd Cambridge England 1996 LEO 912 OMEGA/G34-655e Printed in Germany...