Summary of parameters^a used in the calculations of optical spectra.

E 0(sh)	E 0(h,zz)	ΔEinh	Δθ(h,sh)	Δθ(zz)	s 3	f exc(sh)	τ anni-2exc	τ M→g
681 nm	708 nm	1700 cm−1	20°	120°	0.15	2.4	30 fs	140 ps

^a E ₀(sh), E₀(h), E₀(zz): site energies for chromophores in squeezed helix (sh), original helix (h), and zigzag random coil (zz), respectively; ΔE_inh: FWHM of Gaussian distribution function used for the description of static disorder in site energies; Δθ: FWHM of Gaussian distribution function used to describe static disorder of the torsional angles between neighboring chromophores in the helices (h, sh) and the zigzag random coil (zz); s₃: Huang–Rhys factor of the high-energy contribution to the spectral density (eqn (79)); f_exc(sh): enhancement factor of excitonic couplings in the squeezed helix; τ_anni-2exc: implicit dephasing time constant (eqn (73)) used in the ESA lineshape function; τ_M→g: time constant for transition between Mth exciton state and electronic ground state.