We present a kinetic investigation of electronically excited germanium atoms, Ge(4p2(1D2)), 0.883 eV above the 4p2(3Pj ground state, in the presence of a range of olefins. The optically metastable 'D2 atom was generated photochemically from the low wavelength pulsed irradiation (/l>ca. 160nm) of Ge(CH3)4. in the presence of excess helium gas and the added reactant gases in a slow flow system, kinetically equivalent to

Recent advances in the chemistry of electronically excited atoms

The Collisional Quenching of Electronically Excited Germanium Atoms, Ge(4p2(1D2)), with Olefins Studied by Time-Resolved Atomic Resonance Absorption Spectroscopy

Atomic carbon is one of the most fascinating intermediates encountered in chemistry. There are very few intermediates that possess more energy than a carbon atom. The 3P ground state has a heat of formation of 171 kcal/mol, while two low-lying metastable singlets, C1D) and C(1S), have ΔH f of 201 and 233 kcal/mol, respectively.1 As a consequence of this high energy, carbon atoms are difficult to generate and the design of systems for their production has challenged the ingenuity of many chemists. The rewards for investigators in this area are great, however; the high chemical potential of atomic carbon causes it to undergo a wide variety of interesting and unusual reactions.

The Preparation and Reactions of Atomic Carbon

Emission from barrier discharges in nitrogen and mixtures of nitrogen and helium

Marked differences in laser action (1315 μm) following flash photolysis of CF3I-inert gas mixtures were observed Through the measurement of optical gain and considering the contribution to line broadening, collisional relaxation rate constants were obtained Using another iodine source, ie C2F5I experimental results showed no significant differences

An Indirect Method for Measuring Iodine Quenching Rate Constants Through a Chemical Laser

The dynamics and kinetics of nonadiabatic excitation of C(3P) to C(1D) induced by hyperthermal collisions with N2 molecules are investigated using a quantum mechanical and two semiclassical nonadiabatic methods. The full-dimensional interaction potential energy surfaces and spin-orbit coupling, which facilitates the spin-forbidden process, are represented by a recently constructed diabatic potential energy matrix. The multistate quantum dynamics for selected partial waves found small transition probabilities due to the weak spin-orbit coupling. The spin-flip transition is the most favored near the threshold due to effective curve crossing. Strong oscillations are also found in the probabilities, which are attributable to resonances supported by the deep well in the singlet-state potential. Vibrational state-specified rate coefficients are reported from J-shifted quantum dynamics calculations, and they follow the Arrhenius form. Vibrational excitation in the N2 collision partner is found to increase the excitation rate at low temperatures, but the trend is reversed at high temperatures. The two semiclassical methods qualitatively reproduce the quantum rate coefficients.

Recent advances in the chemistry of electronically excited atoms

Citations

The Collisional Quenching of Electronically Excited Germanium Atoms, Ge(4p2(1D2)), with Olefins Studied by Time-Resolved Atomic Resonance Absorption Spectroscopy

The Preparation and Reactions of Atomic Carbon

Emission from barrier discharges in nitrogen and mixtures of nitrogen and helium

An Indirect Method for Measuring Iodine Quenching Rate Constants Through a Chemical Laser

Quantum and Semiclassical Dynamics of Nonadiabatic Electronic Excitation of C(3P) to C1D) by Hyperthermal Collisions with N2.

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