Abstract
The photoelectron spectrum of acetonitrile has been revisited under high resolution and high sensitivity using the HeI resonance line. Ionization of the three outermost valence molecular orbitals has been discussed in terms of ionization energies and vibrational frequencies. Additional vibration terms have been reported. Ionization of the 2e molecular orbital is accompanied by a Jahn—Teller effect involving the ν 8 degenerate mode. The second band of the spectrum shows weak features assigned to the excitation of the degenerate modes ν 6 and ν 8. The second excited ionic state has been suggested to be of E symmetry.
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