Abstract

A kinetic study of ground state arsenic atoms, As[4p3(4S)], generated by repetitive pulsed irradiation and monitored photoelectrically in absorption by time-resolved attenuation of atomic resonance radiation at λ= 189.0 nm [5s(4P5/2)â†� 4p3(4S)], is presented. The decay of As(44S) was monitored in the presence of various gases for which absolute second order rate constants (kR, cm3 molecule–1 s–1, 300 K) are reported: O2(5.0 ± 0.3 × 10–13); Cl2(6.1 ± 0.9 × 10–12); NO(2.8 ± 0.2 × 10–13); N2O(<5 × 10–16): C2H2(3.9 ± 0.3 × 10–13); C2H4(1.7 ± 0.0 × 10–13) and AsCl3(1.0 ± 0.2 × 10–11). These data are discussed and compared, where appropriate, with analogous data for the other group V ground state atoms and with the data for the optically metastable states, As[4p3(2DJ)] and As[4p3(2PJ)].

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