Vibrational spectroscopy is an essential tool in chemical analyses, biological assays, and
studies of functional materials. Over the past decade, various coherent nonlinear vibrational …

Intersystem crossing (ISC), formally forbidden within nonrelativistic quantum theory, is the
mechanism by which a molecule changes its spin state. It plays an important role in the …

Nonadiabatic mixed quantum–classical (NA-MQC) dynamics methods form a class of
computational theoretical approaches in quantum chemistry tailored to investigate the time …

Ultrafast spectroscopy techniques use sequences of ultrashort light pulses (with femto-to
attosecond durations) to study photoinduced dynamical processes in atoms, molecules …

Theoretical simulations of electronic excitations and associated processes in molecules are
indispensable for fundamental research and technological innovations. However, such …

Coherence phenomena arise from interference, or the addition, of wave-like amplitudes with
fixed phase differences. Although coherence has been shown to yield transformative ways …

Interactions between quasiparticles are of fundamental importance and ultimately determine
the macroscopic properties of quantum matter. A famous example is the phenomenon of …

The transport of excitation energy in molecular aggregates is of crucial importance for the
function of organic optoelectronic devices and next‐generation solar cells. First, this review …

Ultrafast electron and X-ray imaging and spectroscopy are the basis for an ongoing
revolution in the understanding of dynamical atomic-scale processes in matter. The …

2D infrared (IR) spectroscopy is a cutting-edge technique, with applications in subjects as
diverse as the energy sciences, biophysics and physical chemistry. This book introduces the …