“…In particular, the use of Equation (4), in which all the terms associated with changes in the external potential have been neglected, provides a simplified, but very useful, approach to describe charge transfer processes. [2,8,43,[99][100][101][102][103][104][105][106][107][108][109][110][111][112][113][114][115] However, despite the positive aspects of DFT-CR, one must recognize that there are some pending issues, particularly the dependence of the energy with respect to N. In the next section, we will analyze the situation of the behavior of E versus N at a temperature of 0 K, to show the problems that arise, and in the other sections, we will discuss the temperature dependent approach. In the past, there have been important contributions to several aspects concerned with the effects of temperature in the description of DFT-CR.…”