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Issue 43, 2016
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Colored spectrum characteristics of thermal noise on the molecular scale

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Abstract

Thermal noise is of fundamental importance to many processes. Traditionally, thermal noise has been treated as white noise on the macroscopic scale. Using molecular dynamics simulations and power spectrum analysis, we show that the thermal noise of solute molecules in water is non-white on the molecular scale, which is in contrast to the conventional theory. In the frequency domain from 2 × 1011 Hz to 1013 Hz, the power spectrum of thermal noise for polar solute molecules resembles the spectrum of 1/f noise. The power spectrum of thermal noise for non-polar solute molecules deviates only slightly from the spectrum of white noise. The key to this phenomenon is the existence of hydrogen bonds between polar solute molecules and solvent water molecules. Furthermore, for polar solute molecules, the degree of power spectrum deviation from that of white noise is associated with the average lifetime of the hydrogen bonds between the solute and the solvent molecules.

Graphical abstract: Colored spectrum characteristics of thermal noise on the molecular scale

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Publication details

The article was received on 24 Jun 2016, accepted on 12 Oct 2016 and first published on 13 Oct 2016


Article type: Paper
DOI: 10.1039/C6CP04433F
Citation: Phys. Chem. Chem. Phys., 2016,18, 30189-30195
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    Colored spectrum characteristics of thermal noise on the molecular scale

    Z. Zhu, N. Sheng, H. Fang and R. Wan, Phys. Chem. Chem. Phys., 2016, 18, 30189
    DOI: 10.1039/C6CP04433F

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