We rebuild the theory of ultrafast transient-absorption/transmission spectroscopy starting
from the optical response of an individual molecule to incident femtosecond pump and …

The large spectral width of ultrashort optical pulses makes it possible to measure the
complete time‐resolved absorption spectrum of a sample with a single pulse, offering …

Transient absorption following pulsed excitation has been used for many years to record the
kinetics and spectra of transient chemical species. 1–11 A typical experimental setup …

This textbook provides an overview of the basics of ultrafast molecular spectroscopy starting
from time-dependent quantum mechanical perturbation theory in Hilbert space. It …

An approximate theory of femtosecond spectroscopy of nonadiabatically coupled electronic
states is developed. Neglecting the commutators of vibrational Hamiltonians pertaining to …

Femtosecond transient UV/vis absorption spectra of molecules in solution show vibronic
structure initially while pump and probe pulses overlap, superimposed on bands which …

Transient-absorption spectroscopy is a common and well-developed technique for
measuring time-dependent optical phenomena. One important aspect, especially for …

We demonstrate that transient absorption spectroscopy performed with an ultrashort pump
pulse and a chirped, broad-band probe pulse is capable of recording full vibrational spectra …

A nonperturbative approach is developed for the calculation of time-and frequency-gated
spontaneous emission spectra beyond the doorway–window approximation. The basic …

We present a methodology that provides a complete parametric description of the time
evolution of the electronically and vibrationally excited states as detected by ultrafast …