Abstract

Rate coefficients for the O + HCl reaction have been measured by using two differently designed high-temperature photochemistry (HTP) reactors. Measurements were made under pseudo-first-order conditions, (O) {much lt} (HCl), at temperatures from 350 to 1,480 K and pressures from 100 to 613 Torr. Ground-state O atoms were generated by flash photolysis of O{sub 2} or CO{sub 2} and monitored by time-resolved atomic resonance fluorescence with pulse counting. Combining the present data with published measurements in the 350-720 K range yields k(T) = 5.6 {times} 10{sup {minus}21} T{sup 2.87} exp({minus}1,766 K/T)cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} for the 350-1,480 K range with a 2{sigma} confidence interval of 23%, which figure includes a liberal allowance for potential systematic errors.

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