TY - JOUR
T1 - Methoxyl radical fluorescence in the electron impact excitation of dimethylether and related compounds
AU - Johnson, C. A F
AU - Kelly, Stephen D.
AU - Parker, John E.
PY - 1986
Y1 - 1986
N2 - Electron impact excitation of dimethylether, dimethoxymethane and methyl formate at energies above ca. 8 eV leads to production of electronically excited methoxyl radicals, which fluoresce in the 300-450 nm region. Optical emission excitation functions for these methoxyl radicals have been measured. The threshold energy for production of excited methoxyl from dimethylether is 8.4 ± 0.4 eV. At energies only a little above threshold optically forbidden excitation processes are largely responsible for production of the excited methoxyl radicals, whereas at energies above 20 eV optically allowed processes dominate the excitation. In the case of dimethylether, non-linear pressure effects in the energy region close to threshold indicate that a triplet state is produced which may be capable of undergoing collisionally assisted predissociation at mTorr pressures.
AB - Electron impact excitation of dimethylether, dimethoxymethane and methyl formate at energies above ca. 8 eV leads to production of electronically excited methoxyl radicals, which fluoresce in the 300-450 nm region. Optical emission excitation functions for these methoxyl radicals have been measured. The threshold energy for production of excited methoxyl from dimethylether is 8.4 ± 0.4 eV. At energies only a little above threshold optically forbidden excitation processes are largely responsible for production of the excited methoxyl radicals, whereas at energies above 20 eV optically allowed processes dominate the excitation. In the case of dimethylether, non-linear pressure effects in the energy region close to threshold indicate that a triplet state is produced which may be capable of undergoing collisionally assisted predissociation at mTorr pressures.
UR - http://www.scopus.com/inward/record.url?scp=37049075179&partnerID=8YFLogxK
U2 - 10.1039/F29868201481
DO - 10.1039/F29868201481
M3 - Article
SN - 0300-9238
VL - 82
SP - 1481
EP - 1487
JO - Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
JF - Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
IS - 9
ER -