title: Photofragment ion imaging from mass-selected Mg+BrCH3complex: Dissociation mechanism following photoinduced charge transfer.
abstract: We have observed fragment ion images produced by ultraviolet photodissociation of Mg+BrCH3complex ions using a reflectron time-of-flight mass spectrometer combined with an imaging detector. The BrCH3+fragment ion was produced after the 266-nm excitation of Mg+BrCH3. In the image of the BrCH3+ions, a split distribution was observed parallel to the polarization direction of the photolysis laser. In calculated potential energy curves, we found a repulsive potential correlated with a dissociation limit of Mg + BrCH3+: The calculation results indicate that the dissociation and the charge transfer occurred via non-adiabatic process after the 52A' ← 12A' photoexcitation. The obtained energy and angular distributions of BrCH3+photofragments were consistent with the fast BrCH3+formation process on the repulsive potential energy curve.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Okutsu
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Yamazaki
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
authors.forename: Keijiro
authors.initials: K
authors.lastname: Ohshimo
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
authors.forename: Fuminori
authors.initials: F
authors.lastname: Misaizu