Abstract
The photoionization spectrum of H{sub 2}COH was measured over the wavelength range 140-170 nm by using a discharge flow-photoionization mass spectrometer apparatus with synchrotron radiation. Hydroxymethyl radicals (H{sub 2}COH and H{sub 2}COD) were generated in a flow tube by the reaction of F atoms with CH{sub 3}OH(D). Ionization energies (IE) were determined directly from photoion thresholds. The IE values, 7.56 {plus_minus} 0.02 and 7.55 {plus_minus} 0.02 eV for H{sub 2}COH and H{sub 2}COD, respectively, are consistent with previous measurements. Also, the dissociative ionization process, presumed to be H{sub 3}CO* {yields} HCO{sup +} + H{sub 2}, was observed with a threshold at 8.61 {plus_minus} 0.06 eV. 44 refs., 5 figs.
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