A Simple Definition of the Number of Excited Electrons

Key Points

• The aim is to define the number of excited electrons within multiconfigurational wavefunctions using a defined operator.
• Constructed the operator Nex in the context of second quantization.
• Utilized formal definitions to assess the excited electron count.
• Applied computational techniques to ensure accessibility of the definition.
• Provided a formalized definition of excited electrons.
• Demonstrated how the operator Nex accurately reflects electron excitation levels.