Terahertz vibrational modes induced by heterogeneous nucleation in n-alkanes

Autor:	Daniel M. Mittleman, Jonathan P. Laib, Daniel V. Nickel
Rok vydání:	2010
Předmět:	Phase transition Absorption spectroscopy Condensed matter physics Chemical physics Terahertz radiation Chemistry Phase (matter) Molecular vibration Nucleation General Physics and Astronomy Physical and Theoretical Chemistry Atmospheric temperature range Absorption (chemistry)
Zdroj:	Chemical Physics Letters. 493:279-282
ISSN:	0009-2614
DOI:	10.1016/j.cplett.2010.05.075
Popis:	We describe the observation of a broad and strongly temperature-dependent peak in the terahertz absorption spectrum of several linear n-alkanes. On cooling from the liquid into the rotator phase, the absorption is enhanced within a very narrow temperature range at the temperature of the first-order phase transition. This peak is associated with an enhancement in the vibrational density of states, induced by the heterogeneous nucleation of the rotator phase from the liquid. This is similar to the well-known Boson peak in glassy solids, and provides a new experimental tool for the characterization of nucleation dynamics in non-polar molecular liquids.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::779681675fffb728091a51b3d03f4e37 https://doi.org/10.1016/j.cplett.2010.05.075 Zobrazit plný text záznamu Full Text from ScienceDirect