Fig. 5
From: Ultraslow isomerization in photoexcited gas-phase carbon cluster \({{\rm C}}_{10}^ -\)
Rate coefficients of the various relaxation mechanisms as a function of the internal energy (E). Energies are relative to the energy of linear \({{\rm C}}_{10}^ -\) after setting the shift due to its rotational energy to 0 eV. All rate coefficients are relative to this energy scale. The rate coefficients for isomerization and for relaxations from monocyclic \({{\rm C}}_{10}^ -\) are shown taking into account the rotational energy shift corresponding to the smallest rotational quantum number considered for calculations. The vertical line shows this shift for the isomerization barrier. Linear \({{\rm C}}_{10}^ -\) with internal energy above this barrier can undergo isomerization. The dashed lines are the rate coefficients for isomerization and for relaxations from monocyclic \({{\rm C}}_{10}^ -\) without considering any rotational energy shift. For the sake of completeness, the rate coefficients for VAD (\(k_{\rm VAD_c}(E)\)) and IR (\(k_{\rm IR_c}(E)\)) from monocyclic \({{\rm C}}_{10}^ -\) are shown even below the isomerization barrier energy though they come into play only after isomerization. The small rate coefficient for isomerization, kiso(E), evinces a slow isomerization rate
