A wave packet prepared on the 1 B-1(1) potential-energy surface of cis-1,3,5-hexatriene (CHT) is characterized by a very short lifetime of approximate to 20 fs in this state. We present here model calculations of the excited-state dynamics of CHT that are consistent with the experimentally determined population decay time scale and yield an accurate description of the absorption, preresonance and resonance Raman (RR) spectroscopy of the 1 B-1(1) state. The greater diffuseness and complexity of the free jet 1 B-1(1) absorption band of CHT as compared to the 1 (1)A(g) --> 1 B-1(u) transition of trans-1,3,5-hexatriene can be explained by a faster optical dephasing rate and more densely spaced vibronic level structure in the S-2 state of the cis isomer primarily due to the presence of two very active low-frequency S-1-S-2 coupling modes, nu (30) and nu (31). The first measurement of the one-photon 1 (1)A(1) --> 2 (1)A(1) transition of CHT has been reported only ten years ago and the S-1 state has since been thoroughly studied by different techniques. The simulations of the excitation and RR emission profiles of the 2 (1)A(1) state performed for this work are shown to be in quantitative agreement with the observed spectra. One of the most important and controversial questions arising from the spectroscopic information about the 2 (1)A(1) state concerns the nature of the intensity carrier for the one-photon S-0-->S-1 excitation process. It can be shown that the oscillator strength for one-photon transitions into the 2 (1)A(1) vibronic manifold is exclusively borrowed from the electronic 1 B-1(1) configuration. One model Hamiltonian is defined for the representation of wave packet motion in the 1 (1)A(1), 2 (1)A(1), and 1 B-1(1) states and the nuclear coordinate space comprises eight dimensions. The relevant normal modes are either of a(1) or b(1) symmetry, i.e., only first-order intrastate or S-1-S-2 vibronic coupling effects are considered, and have been selected based on the electronic structure information compiled in the preceding paper. (C) 2001 American Institute of Physics.