Electron mobility definition

Metal crystals are formed from the atoms of the electropositive elements. In alloys, a definite orientation of the atoms of each constituent may or may not exist. Metal crystals are characterized by a very strong interatomic bond and by excellent electrical and thermal conductivities, because of high electron mobility. 

ETA indices are an extension of the TAU indices (or Topochemically Arrived Unique indices) [Pal, Purkayastha et al, 1992 Pal, Sengupta et al, 1988,1989,1990], which were defined some years before in the framework of a previous version of the Valence Electron Mobile environment (VEM environment). TAU indices are calculated from previous definitions of core count and VEM count and include four indices the composite topochemical index, denoted by T (similar to the composite ETA index), the functionality index, denoted by F, the skeletal index, denoted by Tr, and the simple branching index, denoted by B. In QSAR studies, these indices were used in combination with —> STIMS indices, connectivity indices, and some information indices [Roy, Pal et al, 1999, 2001]. 

It may be obtained experimentally from a plot of log p vs at a constant temperature. In many organic disordered systems, the hole and electron mobilities were reported and clearly follow the PF relation shown in Equation 3.4 [23-26]. The PF model, however, has a serious deficiency. According to Equation 3.5, it makes a definitive prediction on the value of Ppp. Yet, it turns out that most experimental results deviate significantly from the theoretical value of Ppp. 

Nature of current The nature of the driving force for the electron current is not definitely known. For example, the electron mobility is not expected to be a constant because the relaxation time approximation, which is used to derive Eq. (18), is not necessarily valid. 

Definitions. When positive charges are fixed in a soHd, but the electrons are free to move about, the system is called a soHd-state plasma. In a Hquid-state plasma, both the positive and negative charges are frilly mobile. These soHd-state and Hquid system are examples of condensed matter plasmas as opposed to gaseous plasmas. 

I consider there to be a sharp distinction between the most polar form of a molecule and its ionically dissociated form. The reason for this is empirical An ion is defined as a species carrying a charge equal to an integral multiple of the electronic charge, and this definition implies that it will have a characteristic predictable electronic spectrum and, under suitable conditions, mobility in an electric field. There is so far no evidence which would compel one to abandon this definition, and I think it is important to distinguish clearly in this context between reaction intermediates (chain carriers, active species) of finite life-time, and transition states. 

Since the fraction of electrons and holes, although very small, depends on the (local) oxygen potential and since the mobility of the electronic defects is far larger than that of the ionic defects, the electronic conductivity may, by continuously changing the oxygen potential, eventually exceed the ionic conductivity. By definition, the transference number is t-loa = erion/(crion + crei)> which explicitly yields... 

By definition, the electrical conductivity or due to a concentration n of carriers, all with the (mean) mobility p., is given by a = n e x, e being the electronic charge, and in a simple semiconductor, it is in fact the activation of n (= electrons = nhoies) that produces the activation of a... 

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