i-LAMP and Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, I-25121 Brescia, Italy. Dipartimento di Fisica, Università degli Studi di Milano, I-20122 Milano, Italy.
Nanotechnology. 2013 Dec 20;24(50):505716. doi: 10.1088/0957-4484/24/50/505716. Epub 2013 Nov 27.
The amplitude and phase evolution of the oscillations of a cantilever after a single tip-sample impact are investigated using a cross-correlation wavelet analysis. The excitation of multiple flexural modes is evidenced and the instantaneous amplitude and phase evolution is extracted from the experimental data at all frequencies simultaneously. The instantaneous total force acting on the tip during a single impact is reconstructed. This method has general relevance for the development of an atomic force spectroscopy of single tip-sample interactions, that develop in a few oscillation cycles of the interacting cantilever eigenmodes and their harmonics.
使用互相关小波分析研究了单次针尖-样品冲击后悬臂梁的振动幅度和相位演化。证实了多个弯曲模式的激发，并同时从所有频率的实验数据中提取出瞬时幅度和相位演化。重建了在单次冲击过程中作用在针尖上的瞬时总力。这种方法对于发展单针尖-样品相互作用的原子力光谱学具有普遍意义，因为它在相互作用的悬臂梁本征模式及其谐波的几个振动周期内发展。
