Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual page 70

3
CI Troubleshooting
No reagent gas peaks in NCI
• Reagent gases do not ionize in NCI; look for background ions instead
• Verify tune parameters
• If no background ions are visible, go back to methane PCI
No PFDTD calibrant peaks in NCI
• Look for background ions: 17 (OH
• Verify tune parameters
• Go back to methane PCI
No sample peaks in NCI
• Look for background ions: 17 (OH
• Go back to methane PCI
• Poor quality reagent gas (purity less than 99.99%)
Large peak at m/z 238 in NCI OFN spectrum
• Look for background ions: 17 (OH
• Find and fix your small air leak
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), 35 (Cl
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), 35 (Cl
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), 35 (Cl
5975 Series MSD Troubleshooting and Maintenance Manual
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), and 235 (ReO3 )
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), and 235 (ReO3 )
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), and 235 (ReO3 )