Dipole-dipole intermolecular coupling [Eq. (25), ] for various configurations of transition dipole moments.
Sample configuration of model in Sec. III A.
Absorption spectra of weakly coupled tetramer [Eqs. (11), (21), and (22)] in the slow bath limit . Top: two groups of peaks are formed around and . Central: fine peak structure around (left) and around (right) is shown on an expanded scale. Peaks A–D are absorption of clusters of one to four -states (-states). Bottom: peak A on an expanded scale is further structured for very slow bath .
The 2D photon echo signal [Eq. (12)] from weakly coupled tetramer (parameters correspond to Fig. 3). Both diagonal , and off-diagonal , regions are shown.
Same as in Fig. 4 but for delay time .
Moderately coupled (top panels) and strongly coupled (bottom) tetramer in the slow bath limit . From left: absorption spectrum [ Eq. (11)], the 2D photon echo signal [, Eq. (12)] for delay times and .
Effect of bath timescale in absorption (left panel) and 2D spectrum at delay times (from left to right) , , , of weakly coupled tetramer. Top: Bottom: .
Sample configuration of transition dipoles of model in Sec. III B.
Tensor components of the absorption spectrum , Eq. (11)] of a weakly coupled tetramer [Eqs. (24) and (25) and Fig. 8] in the slow bath limit . Top panel: averaged spectrum. Central panels: and components. Bottom panels: component.
signal (27) for tetramer (Fig. 8) at zero delay times . Molecular tensor components show up in different regions of 2D spectra as marked. Parameters: and .
Same signal and system as in Fig. 10 but at longer delay time .
signal (27) for tetramer (Fig. 8) at zero delay time . Parameters and correspond to Figs. 10 and 11. Molecular tensor components show up in different regions of 2D spectra as marked.
Intensity oscillations at the peak marked at Fig. 12 at short delay times: top (from left): , 0.4, and 0.8; bottom (from left): , 2.2, and 2.8.
Same signal as in Fig. 12 but at long delay time .
Spectral analysis of the one-particle Hamiltonian [Eq. (15)] of a tetramer (Fig. 2). For each bath configuration (first column), eigenfrequencies are given as a function of . Solutions (Ferrari–Cardano quartic formula) for characteristic equation of configuration and characteristic equation of configuration are complicated; we designate them by I–IV. Peaks in weak-coupling absorption spectra (Fig. 3) are assigned in the third column along with oscillator strength in the fourth column. Peaks of strong coupling absorption spectrum (bottom panels of Fig. 6) are assigned in the fifth column. Numerical values of and for intermediate coupling (top panels of Fig. 6) are given oscillator strength in the sixth and last columns, respectively.
Density of clusters in aggregate at high temperatures. Combinatorial weight of all-parallel clusters in the chain with random or orientation of dipoles.
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