Thermo Scientific ESCALAB 250 User Manual (English)

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Monochromated X-Ray

Source with XR5

Electron Gun

Document Number HA600054

Issue 5 (02/07)

Monochromated X-Ray Source with XR5 Electron Gun

Monochromator and XR5 (HA600054) Issue 5

1 Contents

1 Contents ......................................................................................................2

1.1 Figures .......................................................................................................... 3

1.2 Tables ........................................................................................................... 3

2 Introduction .................................................................................................4

2.1 What You Should Have Already Read .......................................................... 4

2.2 Getting Help .................................................................................................. 4

2.3 Health and Safety.......................................................................................... 5

2.3.1 Safety Warnings: ESSENTIAL READING........................................................ 5

2.3.2 Safety Interlocks............................................................................................... 5

3 Description ..................................................................................................8

3.1 Introduction ................................................................................................... 8

3.2 XR5 Electrostatic Electron Gun..................................................................... 9

3.2.1 Cathode............................................................................................................ 9

3.2.2 Anode............................................................................................................... 9

3.3 Water Cooling Circuit .................................................................................. 10

3.4 Monochromator Crystal Assembly .............................................................. 10

3.5 Moving the XR5 Anode ............................................................................... 12

3.6 Monochromator Fine Tuning ....................................................................... 12

3.6.1 Alignment of the Analysis Centre and Microscope Cross Hairs..................... 12

3.7 T352/NT Computer-Controlled Power Supply ............................................. 14

4 Monochromator Operation ......................................................................15

4.1 Avantage Data System Monochromator Controls ....................................... 15

4.1.1 Errors and Warnings ...................................................................................... 16

4.2 Different XR5 Operating Modes .................................................................. 16

4.3 Switching on the Re-circulated Water ......................................................... 17

4.4 Observing the Monochromator Spot ........................................................... 17

4.5 Limits of Operation...................................................................................... 18

5 Maintenance ..............................................................................................19

5.1 Degassing - after a System Vent and Bake ................................................ 19

5.2 Re-alignment after a Bake .......................................................................... 19

5.3 Anode Maintenance .................................................................................... 21

5.4 Replacing Anodes ....................................................................................... 22

5.5 Replacing Filaments/Cathodes ................................................................... 23

5.6 Anode Cap Cleaning ................................................................................... 27

5.7 Ceramic Replacement................................................................................. 27

5.8 Crystal Maintenance ................................................................................... 27

5.9 Fault Finding ............................................................................................... 28

5.10 Fuses Information – for Service Engineers ................................................. 29

6 Index...........................................................................................................30

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Thermo Scientific ESCALAB 250 Specifications

General

Energy Range	0-1500 eV
Type	X-ray Photoelectron Spectroscopy (XPS)
X-ray Source	Al Kα and Mg Kα
Vacuum System	Ultra-high vacuum
Sample Stage	Motorized sample stage
Detector	Multi-channel detector
Software	Avantage data system for acquisition, processing, and analysis
Analysis Technique	X-ray Photoelectron Spectroscopy (XPS), Ultraviolet Photoelectron Spectroscopy (UPS), Auger Electron Spectroscopy (AES)
Analyzer	180° hemispherical analyzer with multi-channel detector