The electronic states of 2-furanmethanol (furfuryl alcohol) studied by photon absorption and electron impact spectroscopies
Résumé
The photoelectron spectrum of 2-furanmethanol~furfuryl alcohol!has been measured for ionizationenergies between 8 and 11.2 eV and the first three ionization bands assigned top3,p2, andnoionizations in order of increasing binding energy. The photoabsorption spectrum has been recordedin the gas phase using both a synchrotron radiation source~5–9.91 eV, 248 –125 nm!and electronenergy-loss spectroscopy under electric-dipole conditions~5–10.9 eV, 248 –90 nm!. The~UV!absorption spectrum has also been recorded in solution~4.2– 6.36 eV, 292–195 nm!. The electronicexcitation spectrum appears to be dominated by transitions betweenpandp*orbitals in thearomatic ring, leading to the conclusion that the frontier molecular orbitals of furan are affected onlyslightly on replacement of a H atom by the – CH2OH group. Additional experiments investigatingelectron impact at near-threshold energies have revealed two low-lying triplet states and at least oneelectron/molecule shape resonance. Dissociative electron attachment also shows to be widespread infurfuryl alcohol.The photoelectron spectrum of 2-furanmethanol~furfuryl alcohol!has been measured for ionizationenergies between 8 and 11.2 eV and the first three ionization bands assigned top3,p2, andnoionizations in order of increasing binding energy. The photoabsorption spectrum has been recordedin the gas phase using both a synchrotron radiation source~5–9.91 eV, 248 –125 nm!and electronenergy-loss spectroscopy under electric-dipole conditions~5–10.9 eV, 248 –90 nm!. The~UV!absorption spectrum has also been recorded in solution~4.2– 6.36 eV, 292–195 nm!. The electronicexcitation spectrum appears to be dominated by transitions betweenpandp*orbitals in thearomatic ring, leading to the conclusion that the frontier molecular orbitals of furan are affected onlyslightly on replacement of a H atom by the – CH2OH group. Additional experiments investigatingelectron impact at near-threshold energies have revealed two low-lying triplet states and at least oneelectron/molecule shape resonance. Dissociative electron attachment also shows to be widespread infurfuryl alcohol.