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Updated: Aug 25, 2026

Piezoreflectance Spectroscopy of Optical Transitions in van der Waals Layered Crystals
Published on: May 22, 2026
State-resolved collision-induced electronic transitions
1Department of Chemistry, The Johns Hopkins University, Baltimore, MD 21218-2685, USA. pjdagdigian@jhu.edu
Abstract:
Laser and molecular beam techniques have enabled researchers to determine the rovibrational levels populated in collision-induced electronic transitions from specified initial levels of several diatomic molecules. As exemplified by the N2+- and CN-rare-gas systems, such measurements, in combination with theoretical calculations of cross sections for these state-to-state collisional processes, provide a means to understand in detail the dynamics of these electronic quenching and energy transfer processes. The present article reviews state-to-state studies of collision-induced electronic transitions. The various collision systems studied provide examples of both perturbation-assisted "gateways" between the initial and final electronic states and perturbation-independent transitions enabled by nonadiabatic mixing induced by the collision partner.
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