Ground state configurations, survey

The plan of this chapter is as follows. The next section briefly reviews the CC formalism for the ground state. This is necessary since the LR-CC and EOM-CC approaches start from the CC ground state description. It also introduces some notation that will be used in later sections. Next, the basics of the exact EOM-CC approach are derived, showing how an eigensystem is arrived at. After some aspects of characterizing an electronic transition, EOM-/LR-CC methods that have been developed and implemented are surveyed. The next section presents a numerical assessment of some of the main methods. Finally, a few illustrative applications are summarized. Some aspects of EOM-CC methods are discussed in Chapter 2. The symmetry-adapted cluster configuration interaction (SAC-CI) method can be related to EOM-CC methods. The SAC-CI method and several impressive applications thereof are described in Chapter 4. 

There are 78 known elements beyond the 36 we have considered. Let s survey the ground-state electron configurations to highlight some key ideas. 

SURVEY OE ELECTRONIC CONFIGURATIONS OF DIATOMIC MOLECULES IN THEIR GROUND STATE... 

The spectroscopy of diatomic molecules containing transition metals underwent a thorough review by Cheetham and Barrow ) section we merely wish to display a list of known molecules and to survey present ideas of their ground states and corresponding electronic configurations. The available data are presented in Table XVII. 

---