150
4 Maintaining the MSD
To clean the ion source
To clean the ion source
Materials needed:
Abrasive paper (5061-5896)
Alumina abrasive powder (8660-0791)
Aluminum foil, clean
Cloths, clean (05980-60051)
Cotton swabs (5080-5400)
Glass beakers, 500 ml
Gloves, clean, lint-free
large (8650-0030)
small (8650-0029)
Solvents
acetone, reagent-grade
methanol, reagent-grade
methylene chloride, reagent grade
Ultrasonic bath
1 Disassemble the ion source (page 148).
2 Collect the following parts to be cleaned:
• Repeller
• Interface socket
•Source body
• Drawout plate
• Drawout cylinder
•Ion focus lens
• Entrance lens
These are the parts that contact the sample or ion beam. The other parts normally
should not require cleaning.
&$87,21
If insulators are dirty, clean them with a cotton swab dampened with reagent-grade
methanol. If that does not clean the insulators, replace them. Do not abrasively or
ultrasonically clean the insulators.
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