I am running natural frequency experiments on your NSC12 tipless cantilevers and I am seeing increases or decreases of 20 to 50 Hz of the resonant frequency during the time. What is the reason?
The elastic modulus of Si changes as a function of temperature, which brings about the variation of the resonant frequency. The composition of the atmosphere is also crucial when you are talking about such precision. In the case the difference in gas density and friction influences the q-factor and the shift of the resonant frequency with respect to that in vacuum.
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