The pulsed field ionization-photoelectron (PFI-PE) spectrum of allyl radical CH2CHCH2(C3H5) in the energy range of 6520066600cm1 has been measured using vacuum ultraviolet laser. Based on the simulation of the rotational structures resolved in the vibrational PFI-PE bands of C3H5+(X̃A11;00+andν7+=1), the ionization energies (IEs) of C3H5(X̃A22;00) to form C3H5+(X̃A11;00+andν7+=1) are determined to be 65584.6±2.0cm1(8.13146±0.00025eV) and 66020.9±2.0cm1(8.18556±0.00025eV), respectively, where ν7+(a1) is the symmetric C–C–C bending mode of C3H5+(X̃A11). These values are compared to IE(C3H5) values obtained in previous experimental and high-level ab initio quantum theoretical studies.

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