Dielectric properties of molecular glass formers [Elektronische Ressource] : from the liquid state to the tunneling regime / von Catalin P. Gainaru

Dielectric Properties of Molecular Glass Formers; from the Liquid State to the Tunneling Regime Der Universität Bayreuth zur Erlangung des Grades eines Doktors der Naturwissenschaften (Dr. rer. nat.) vorgelegte Abhandlung von Catalin P. GAINARU geboren am 27. Mai 1977 in Botosani, Rumänien 1. Gutachter: Prof. Dr. E.A. Rössler 2. Gutachter: Prof. Dr. R. Böhmer “Make everything as simple as possible, but not simpler.” Albert Einstein Contents I. Introduction 1 I.1. The glass transition 1 I.2. Relaxation processes in molecular glass forming systems 2 I.3. Scope and structure of the present study 4 II. Dielectric spectroscopy: theory, experiment and phenomenological description of the dielectric response 7 II.1. Theoretical background 7 II.2. Experimental details 13 II.2.1. Frequency domain measurements 14 .2. Time 16 II.2.3. Low temperature 17 II.3. Phenomenological description of the dielectric response 17 II.3.1. The Debye function 17 .2. Cole-Davidson function 19 II.3.3. The Kohlrausch 19 .4 Distributions of relaxation times 20 III. The evolution of the dynamic susceptibility of simple glass formers from the liquid state to the tunneling regime; overview 23 III.1.