Journal of Molecular Spectroscopy 

TL;DR: In this paper, a modified Wang basis function is proposed which has the property of making all operators which are even powers of angular momentum pure real and all odd powers pure imaginary, and a generalized direction cosine operator is described, which can be calculated in a Wang basis using spherical tensor formalism.

TL;DR: In this article, the absorption spectra of metal porphyrins derived from the basic skeleton are discussed in terms of a four-orbit model, that is intensity changes and energy shifts are related to the properties of two top filled and two lowest empty pi orbitals.

TL;DR: In this paper, the configuration interaction parameters for reduced porphyrins, azaporphins, and benzporphins were determined using the LCAO-MO (Huckel) calculation.

TL;DR: The rotational energy levels of diatomic and linear polyatomic molecules often occur in closely spaced pairs of opposite parity as discussed by the authors, and the lower levels of each pair usually form a characteristic set (for example, it may be possible to describe them all with a single energy level expression).

TL;DR: Fluorescence spectra, quantum yields, natural radiative lifetimes, and absorption oscillator strengths for a number of porphyrins in benzene solution were reported in this paper.