Picture of two heads

Open Access research that challenges the mind...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

Structural relaxation in the hydrogen-bonding liquids n-methylacetamide and water studied by optical kerr effect spectroscopy

Turton, D.A. and Wynne, K. (2008) Structural relaxation in the hydrogen-bonding liquids n-methylacetamide and water studied by optical kerr effect spectroscopy. Journal of Chemical Physics, 128 (15). p. 154516. ISSN 0021-9606

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

Structural relaxation in the peptide model N-methylacetamide (NMA) is studied experimentally by ultrafast optical Kerr effect spectroscopy over the normal-liquid temperature range and compared to the relaxation measured in water at room temperature. It is seen that in both hydrogen-bonding liquids, beta relaxation is present, and in each case, it is found that this can be described by the Cole-Cole function. For NMA in this temperature range, the alpha and beta relaxations are each found to have an Arrhenius temperature dependence with indistinguishable activation energies. It is known that the variations on the Debye function, including the Cole-Cole function, are unphysical, and we introduce two general modifications: One allows for the initial rise of the function, determined by the librational frequencies, and the second allows the function to be terminated in the alpha relaxation. (c) 2008 American Institute of Physics.