General Maintenance 6
To Clean the Ion Source
Operation Manual 125
4 Abrasively clean the surfaces that contact the sample or ion
beam.
Use an abrasive slurry of alumina powder and reagent-grade
methanol on a cotton swab. Use enough force to remove all
discolorations. Polishing the parts is not necessary; small
scratches will not harm performance. Also abrasively clean
the discolorations where electrons from the filaments enter
the source body.
5 Rinse away all abrasive residue with reagent-grade methanol.
Make sure all abrasive residue is rinsed away before
ultrasonic cleaning. If the methanol becomes cloudy or
contains visible particles, rinse again.
6 Separate the parts that were abrasively cleaned from the
parts that were not abrasively cleaned.
7 Ultrasonically clean the parts (each group separately) for 15
minutes in each of the following solvents:
• Methylene chloride (reagent-grade)
• Acetone (reagent-grade)
• Methanol (reagent-grade)
8 Place the parts in a clean beaker. Loosely cover the beaker
with clean aluminum foil (dull side down).
9 Dry the cleaned parts in an oven at 100 °C for 5–6 minutes.
CAUTION
Always wear clean gloves to prevent contamination when working in
the analyzer chamber.
WARNING
All of these solvents are hazardous. Work in a fume hood and take all
appropriate precautions.
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