Photoelectron spectrum acetylene

FIGURE 6.8 Photoelectron spectrum of 20 produced by laser vaporization of graphite in helium gas (spectrum reproduced from Reference 37). Inset the totally symmetric tangential stretching mode of the acetylenic structure. 

The charge transfer transitions are expected to be mainly L —> M ttu - ( + l)s and % (n+ l)p. The experimental ionization potential of acetylene is 11.41 eV, both vertical and adiabatic since the first vibronic band in the photoelectron spectrum is also the most intense The asymptotic charge transfer energies are then the difference between this IP and appropriate EA of each metal ion, and are the same for both triplet and singlet electronic states. These are tabulated in Table 20. 

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