We are not able to stabilize the baseline of the resonant frequency in ultrapure water with our gold quartz crystal (5 and 10 MHz) because we have random frequency jumps but only on one measured frequency and not on all harmonics as you can see on the picture.

However, the quartz is cleaned, the cell as well as the whole fluidic system and moreover it has been diagnosed that the machine works well. Finally, the temperature is stable and there are no bubbles on the surface of the quartz (the solution is degassed before injection)

If you are using QCM under liquid flow condition and have such experience, please, share with us.

Thank you.

With regards.

Marc Keller