Quartz Crystal Microbalance equilibrium

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SUMMARY

The discussion centers on troubleshooting issues with achieving equilibrium in a Quartz Crystal Microbalance (QCM) system. Users report inconsistent frequency readings despite isolating the chamber from air flows and vibrations, and ensuring the cleanliness of the crystals and removable parts. Key factors affecting equilibrium include potential vibration isolation inadequacies and improper crystal mounting. Experienced users are encouraged to share insights on vacuum pumping methods and equipment specifics to enhance stability.

PREREQUISITES
  • Understanding of Quartz Crystal Microbalance (QCM) operation
  • Knowledge of vibration isolation techniques
  • Familiarity with vacuum systems and pumping methods
  • Experience in crystal mounting procedures
NEXT STEPS
  • Research vibration isolation methods for QCM systems
  • Learn about effective vacuum pumping techniques for QCM applications
  • Investigate proper mounting techniques for quartz crystals
  • Explore troubleshooting guides for QCM frequency stability
USEFUL FOR

This discussion is beneficial for researchers, laboratory technicians, and engineers working with Quartz Crystal Microbalance systems, particularly those facing challenges in achieving stable frequency readings and equilibrium in their measurements.

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Hi guys,

I am a new user of QCM and I am having trouble reaching equilibrium. I have isolated the chamber from air flows and vibrations, the crystals are clean and all the other removable parts have been cleaned as well.
The real problem is that sometimes I have managed to reach equilibrium by doing the exact same steps but 4/5 tries the frequency just giggles around in both air and water interfaces.

I do not know what else to try.

If any experienced users of QCM have suggestions, they would be very welcome and I would be very thankful.
 
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I'm assuming you're using it for monitoring deposited film thickness?

If you tell me which company made your quartz crystal monitor, I'll see what I can scrounge up.
 
Last edited:
How are you pumping down the system to achieve a vacuum? Your vibration isolation may be insufficient. Or your station is picking up vibrations from another external source, particularly if you are located in an upper floor of a building.

If those are not the answer, there may be a problem with the mounting of the crystal.

There are other possibilities. Is this a new system?
 

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