Resonance electron capture by perylene molecules. Relation with negative differential conductance

[Display omitted] •Negative ions of inter-shell resonance and ground state are mixed in perylene.•Mixing states increases the lifetime of inter-shell resonance for light emission.•Light emission along with intersystem crossing provides registration of the ion.•The most intensive above-zero long-lived negative ions have multiplicity of four.•Ions with multiplicity of four are related to negative differential conductance. Five resonant states of long-lived negative molecular ions were defined during the gas-phase resonant electron capture by perylene. Three states are the ground state (0.05 eV) and two shape resonances (0.4 eV and 0.7 eV). Core-excited Feshbach resonance (1.4 eV) transits into a quartet state, which delays the autodetachment of additional electron and causes the negative differential conductance in tunneling transition due to the spin prohibition. Inter-shell resonance (2.5 eV) is mixed with the ground state with the same symmetry and is likely to be stabilized through the light emission with simultaneous transition to a quartet state.