论文标题
Mössbauer光谱的应用在研究超声激发的颗粒状培养基的振动中
Application of Mössbauer spectroscopy to study vibrations of a granular medium excited by ultrasound
论文作者
论文摘要
结果表明，对颗粒培养基的Mössbaur光谱的分析，浸入没有硬化剂的环氧树脂中，可以研究颗粒的机械振动。在我们的实验中，平均尺寸为1.25微米的小乙酰钾的小颗粒起着颗粒的作用。该化合物由$^{57} $ fe同位素丰富。用压电聚合物膜诱导带有频率12.72 MHz的振动树脂中的颗粒振动。在休息时，$^{57} $ fe的MössbauerSpectrum在铁氰化钾中的$ fe由一条线组成。 Nuclei的超声振动将线分为梳子结构，其周期等于振动频率。频谱分析允许估计该介质中颗粒的振动幅度和超声的衰减。所提出的方法是唯一的，因为它允许用几个MHz频率振动的颗粒的子立方体位移。
It is shown that analysis of Mössbaur spectra of a granulated medium, immersed into the epoxy resin without hardener, allows to study mechanical vibrations of granules. In our experiments, small particles of the potassium ferrocyanide with a 1.25 micron mean size played a role of granules. This compound was enriched by $^{57}$Fe isotope. Particle vibrations in the vibrated resin with the frequency 12.72 MHz were induced by piezo polymer film. At rest, Mössbauer spectrum of $^{57}$Fe in the potassium ferrocyanide consists of a single line. Ultrasonic vibration of nuclei splits the line into a comb structure with a period equal to the vibration frequency. The spectrum analysis allows to estimate the vibration amplitude of particles and decay of the ultrasound in this medium. The proposed method is unique since it allows to measure subangstrom displacements of particles vibrating with several MHz frequency.
