T. M. Ramond

Vibronic structure of alkoxy radicals via photoelectron spectroscopy

Ultraviolet photoelectron spectra of CH3O−, CH3CH2O−, (CH3)2CHO−, (CH3)3CO−, as well as CD3O− and CD3CD2O− are presented, providing improved electron affinities and new information on vibronic coupling in the corresponding neutral radicals. Jahn-Teller vibronic transitions are assigned to e vibrational modes of X 2E CH3O. The excitation energy of the A 2A′ state of CH3CH2O with respect to the X 2A″ state is observed directly at 355±10 cm−1. Vibronic coupling between these low-lying electronic states perturbs the observed vibronic levels. Features of the (CH3)2CHO− photoelectron spectrum are assigned. The splitting between the X 2A′ and A 2A″ states of (CH3)2CHO is determined to be 1225±65 cm−1. Significant vibronic coupling is not observed in (CH3)2CHO. Vibrational assignments are made for the spectral features of (CH3)3CO and no Jahn-Teller effects are observed directly. Electron affinities (EAs) for the neutrals (RO) are (in eV); EA(CH3O)=1.572±0.004; EA(CD3O)=1.559±0.004; EA(CH3CH2O)=1.712±0.004; EA...

Photoelectron spectroscopy of SnO

The 364 nm laser photoelectron spectrum of SnO− is reported. Transitions from both 2Π1/2 and 2Π3/2 spin–orbit states of the anion to the X 1Σ+ state of SnO are observed. The electron affinity of SnO is found to be 0.598±0.006 eV.