Dissociative VUV photoionization of butanediol isomers

- Butanediol ion isomers display distinct fragmentation behavior.
- Synchrotron radiation study of ion yields and appearance energies.
- Comparison with CBS-QB3 calculated thresholds to identify fragmentation channels.
- 2,3-Butanediol ion readily cleaves extended C(2)C(3) bond.
- H2O loss in 1,3-butanediol facilitated by intramolecular H-bonded structure.