Hey, this is an English text. I want you to translate it into the Tunisian dialect. Please follow these steps:
1. Translate step by step and highlight differences between Tunisian dialect and Modern Standard Arabic.
2. Highlight sections you are confident translating into the Tunisian dialect.
Translate this text into the Tunisian dialect, focusing on capturing the essence of the language nuances:

--- abstract: 'The quantum-dynamical mechanism of photoinduced subpicosecond exciton dissociation and the concomitant formation of a charge-separated state at a TFB:F8BT polymer heterojunction is elucidated. The analysis is based upon a two-state vibronic coupling Hamiltonian including an explicit 24-mode representation of a phonon bath comprising high-frequency (C$=$C stretch) and low-frequency (torsional) modes. The initial relaxation behavior is characterized by coherent oscillations, along with the decay through an extended nonadiabatic coupling region. This region is located in the vicinity of a conical intersection hypersurface. A central ingredient of the analysis is a novel effective mode representation, which highlights the role of the low-frequency modes in the nonadiabatic dynamics. Quantum dynamical simulations were carried out using the multiconfiguration time-dependent Hartree (MCTDH) method.' author: - Hiroyuki Tamura - 'Eric R. Bittner' - Irene Burghardt title: 'Exciton dissociation at donor-acceptor polymer heterojunctions: quantum nonadiabatic dynamics and effective-mode analysis' --- 2[g\^[(2)]{}]{} ![ (A) (Color online) Schematic diagram illustrating the electronic structure and photophysics of the TFB:F8BT donor-acceptor heterojunction. The solid and dashed lines indicate the energy levels and band offset $\Delta E$, respectively; the solid arrows indicate the electron occupancies. (B) Simplified one-dimensional scheme of the photoexcitation and subsequent nonadiabatic potential crossing process. The black, blue and red curves indicate the ground, exciton and charge transfer states, respectively. The dashed lines indicate the adiabatic potentials at the avoided crossing. (C) Optimized molecular geometry, from density functional theory (DFT) calculations, of the parallel TFB and F8BT polymer chains at the heterojunction interface. ](figure1){width="\columnwidth"} The photophysics of $\pi$-conjugated organic semiconductor systems is a key ingredient in the technological development of optoelectronic devices.[@Friend97] Due to their spatially extended structure, these systems exhibit both the molecular characteristics of their components and the collective electronic excitations (exciton states) characteristic of lattice structures. The coupling between electronic and nuclear motions results in the localization (“self-trapping”) of exciton states, along with the coherent nuclear dynamics and vibronic coupling phenomena known from molecular systems.[@SR06; @BR06; @RB06; @BRK05; @KB03a; @KB03; @KBB01] Experiments have indeed provided evidence for coherent vibrational dynamics[@LCBS03] and ultrafast (typically $\sim$ 100 fs) decay of electronic excitations.[@Ketal93; @Setal06] Of particular interest are ultrafast exciton dissociation processes at polymer heterojunctions,[@BR06; @RB06; @BRK05; @Setal06; @Hetal99; @Metal04] comprising two materials with a $\Delta E$ off-set between the constituent valence and conduction bands (see Fig. 1). In molecular terms, this is the energy difference between the HOMO or LUMO levels of the two components. If $\Delta E$ is large compared to the exciton binding energy $\epsilon_B$ (for typical organic polymers, $\epsilon_B \approx 0.5$ eV), the photoexcited exciton state decays to an interfacial charge-separated state (or exciplex).[@BR06; @RB06; @BRK05; @Setal06; @Hetal99; @Metal04] Generally, such a situation is desirable for photovoltaic systems where $\Delta E$ provides the driving force for charge-separation upon photoexcitation. On the other hand, if $\epsilon_B > \Delta E$, the excitonic state is stable, and such situations are best suited for light-emitting diode (LED) applications. If $\epsilon_B\simeq\Delta E$, charge separation and exciton regeneration processes tend to compete.[@Setal06; @Hetal99; @Metal04] Even though considerable progress has