Signatures of multiple time-scale behaviour in the power spectra of water

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• 作者：Mudi ; Anirban ; Ramaswamy ; Ramakrishna ; Chakravarty ; Charusita
• 刊名：Chemical Physics Letters
• 出版年：2003
• 出版时间：July 31, 2003
• 年：2003
• 卷：376
• 期：5-6
• 页码：683-689
• 全文大小：279 K

文摘

Power spectra associated with fluctuations in the tagged particle potential and kinetic energies are analysed for bulk SPC/E water for a range of temperatures along the 1.0 g/cm³ isochore. Fluctuations in the tagged particle potential energies give rise to 1/f^α noise, indicative of multiple time-scale behaviour, over a temperature-dependent frequency regime. In contrast, the tagged particle centre-of-mass and rotational kinetic energies, which are indicative of the magnitude of local thermal fluctuations, do not show any evidence of 1/f^α behaviour.