The interaction of exciton‐plasmon coupling and the conversion of exciton‐plasmon‐photon have been widely investigated experimentally and theoretically. In this review, we introduce the exciton‐plasmon interaction from basic principle to applications. There are two kinds of exciton‐plasmon coupling, which demonstrate different optical properties. The strong exciton‐plasmon coupling results in two new mixed states of light and matter separated energetically by a Rabi splitting that exhibits a characteristic anticrossing behavior of the exciton‐LSP energy tuning. Compared to strong coupling, such as surface‐enhanced Raman scattering, surface plasmon (SP)‐enhanced absorption, enhanced fluorescence, or fluorescence quenching, there is no perturbation between wave functions; the interaction here is called the weak coupling. SP resonance (SPR) arises from the collective oscillation induced by the electromagnetic field of light and can be used for investigating the interaction between light and matter beyond the diffraction limit. The study on the interaction between SPR and exaction has drawn wide attention since its discovery not only due to its contribution in deepening and broadening the understanding of SPR but also its contribution to its application in light‐emitting diodes, solar cells, low threshold laser, biomedical detection, quantum information processing, and so on.

Surface plasmons, the free electrons' collective oscillations, have been used in the signal detection and analysis of target molecules, where the local surface plasmon resonance (LSPR) can produce a huge EM field, thus enhancing the SERS signal.

A single-sheeted potential energy surface is reported for the electronic ground-state of H2S by fitting accurate multireference configuration interaction energies calculated using aug-cc-pVTZ and aug-cc-pVQZ basis sets with extrapolation of the electron correlation energy to the complete basis set limit, plus extrapolation to the complete basis set limit of the complete-active-space self-consistent field energy. A switching function formalism has been used to warrant the correct behavior at the H2(X Σ1g+)+S(D1) and SH(X Π2)+H(S2) dissociation limits. The topographical features of the novel global potential energy surface are examined in detail, with the former being used for exploratory quasiclassical trajectory calculations of the thermal rate constant for the S(D1)+H2, S(D1)+D2, and S(D1)+HD reactions at room temperature. A comparison with other available potential energy surfaces as well as kinetics data is also provided.