] The ground state for helium in electron configuration is 1s². The lowest excited state is 1s¹ 2s¹, while the 1s¹ 2p¹ configuration has higher energy. Using the spectroscopic notation, write down the allowed configurations according to the Pauli exclusion principle for each of the states above, explaining your reasoning. • Following the Hund's rules, give the ordering of the energy levels for each state, motivating your answers. Which transitions are allowed according to the selection rules between each of the excited state and the ground state?

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Electronic Transitions and Spectroscopy

The term “electronic” connotes electron, and the term “transition” implies transformation. In a molecule, the electrons move from a lower to a higher energy state due to excitation. The two energy states, the ground state and the excited state are the lowest and the highest energy states, respectively. An energy change is observed with this transition, which depicts the various data related to the molecule.

Photoelectron Spectroscopy

Photoelectron spectroscopy (PES) is a part of experimental chemistry. It is a technique used in laboratories that involves projecting intense beams of radiation on a sample element. In response, the element ejects electrons for which the relative energies are measured.