We revisit the reorientational dynamics of 1-propanol as a prototype of a monohydroxy alcohol and H-bonding system by dielectric spectroscopy (DS) and depolarized dynamic light scattering (DDLS). In particular, we address the question of whether the Debye relaxation, which is seen as a dominant process in DS, is visible in light scattering and discuss how the Johari–Goldstein (JG) β-process, which is also a prominent feature of the dielectric spectrum, appears in photon correlation spectroscopy. For that purpose we performed depolarized photon correlation experiments with an improved setup and performed additional time domain dielectric experiments which gives us the possibility to compare dielectric and light scattering data in a broad temperature range. It turns out that the improved setup allows to unambiguously identify the JG β-process, which shows almost identical properties in DDLS as in the dielectric spectra, but a Debye relaxation is not present in the DDLS data and can be excluded down to a level of 2.5% of the α-process amplitude.

中文翻译：

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介电谱和去极化动态光散射探测1-丙醇的德拜过程和β-弛豫

我们通过介电谱（DS）和去极化动态光散射（DDLS）重新审视了1-丙醇作为单羟基醇和氢键系统的原型的重新定向动力学。特别是，我们解决了德比弛豫问题（在DS中被视为主要过程）是否在光散射中可见的问题，并讨论了Johari–Goldstein（JG）β过程（这也是该过程的一个突出特征）如何发生的问题。介电谱，出现在光子相关光谱中。为此，我们以改进的设置进行了去极化光子相关实验，并进行了其他时域介电实验，这使我们有可能在较宽的温度范围内比较介电和光散射数据。事实证明，改进后的设置可以明确识别JGβ过程，