SOFT-X-RAY IONIZATION AND FRAGMENTATION OF N-PROPANOL AND ISOPROPANOL

Threshold electron and total ion yield spectra are presented for the n ear C and O Is edge photoexcitation of n- and iso-propanol. To our kno wledge these are the first such data for iso-propanol, and represent t he first direct measurement of the core ionization energies of these m olecules by threshold photoelectron spectroscopy. In particular, the C Is energies for n-propanol are found to be lower (by about 0.5 eV) th an determined indirectly in a previous study. Application of multiple coincidence techniques has enabled determination of the branching rati os of the dissociative multiple ionization channels uniquely associate d with each core edge in both molecules. These show evidence for a gre ater degree of energy localization in n-propanol than in iso-propanol, and for the existence of long-lived excited states, allowing intramol ecular energy transfer to occur.