ABSTRACT X-ray photon correlation spectroscopy is used to study the dynamics of the glass former across the glass transition temperature, . The obtained data confirm that while the structural relaxation drives the density rearrangements in the liquid phase, a beam-induced dynamics is the dominant effect around and below . The use of a hybrid photon counting detector allows us to obtain high-quality correlation functions with a characteristic decay time down to a second. The characteristic time of the induced dynamics displays a linear dependence on the inverse of the absorbed X-ray power over the whole observed range, i.e. up to powers of 0.2 eV/atom/s. Up to these values, then, an X-ray irradiated glass sample explores structurally equivalent configurations on a timescale dictated by the absorbed power.

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探索 B2O3 跨越玻璃化转变的动力学：X 射线光子相关光谱研究

摘要 X 射线光子相关光谱用于研究玻璃形成物在整个玻璃化转变温度下的动力学。获得的数据证实，虽然结构弛豫驱动液相中的密度重排，但束诱导动力学是周围和以下的主要影响。混合光子计数检测器的使用使我们能够获得特征衰减时间低至一秒的高质量相关函数。诱导动力学的特征时间在整个观察范围内显示出与吸收 X 射线功率的倒数的线性相关性，即高达 0.2 eV/atom/s 的功率。然后，在达到这些值之前，X 射线照射的玻璃样品会在由吸收功率决定的时间尺度上探索结构等效的配置。