Absolute Fluorescence Yields from Electron-Irradiated Gases. 3. XeCl* and XeI*

Abstract

The absolute total fluorescence yield for the XeCl* (B,C) 2Σ1/2 + → 2Σ1/2 + transition has been determined from pulse electron-irradiated Xe/CFCl3 gas mixtures. Since no experimental resolution of the two formation pathways was achieved, individual, unquenched limiting yields for the excited state, Xe* + CFCl3 → XeCl* + .CHCl2, G o* = 2.4 ± 0.6, and ionic recombination, Xe2 + + Cl- + Xe → XeCl* + 2Xe, G o + = 3.2 ± 0.5, reactions have been calculated by modeling the dependence of the total fluorescent yield on xenon and halide gas pressure. Analogous experiments were also conducted for the formation of the XeI* exciplex from the irradiation of Xe/CF3I gas mixtures. Individual values for the two component formation processes were again calculated from total gas yields, giving G o* = 0.31 ± 0.08 and G o + = 4.5 ± 0.6. These yields are compared to the predictions of current theoretical models, and the effects of alternate recombination pathways are discussed.

Steady‐State and Time‐Resolved Studies on Photoinduced Disulfide Bond Cleavage Using Aniline as an Electron Donor

“…From the pseudo‐first‐order decay kinetics of solvated electrons (observed at λ max =650 nm, where the overlap with other species is negligible) with variable RSSR concentrations the rate constants were determined (Table 1). These rate constants are in excellent agreement with values of other disulfides, RSSR, in aqueous solution detected by pulse radiolysis 9, 20…”

Experimental and computational study of neutral xenon halides (XeX) in the gas phase for X=F, Cl, Br, and I

“…These interactions were described in terms of van der Waals forces in all the xenon halides, with the exception of XeF for which the experimental bond length (r XeϪF ) of 2.29 Å and a dissociation energy (D e ) of 3.36 kcal/mol were interpreted in terms of a partial covalent character in the ground state. 5,7 Therefore, the xenon monohalides are still of considerable interest, 8 and in particular, the theoretical 9 and experimental characterization of the ground states is still incomplete.…”