English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Some time ago this Laboratory initiated a program to study decomposition kinetics in a shock tube employing infrared emission techniques. The choice to make shock tube measurements in the infrared region of the spectrum was made possible by the appearance on the commercial market of infrared detectors of rapid response (time constants < 1 tlsec.). Although Windsor, Davidson, and Taylor2 preceded us in their study of CO vibrational relaxation in a shock tube, we believe this Laboratory was the first to report kinetic rate data obtained from infrared emission. In previous publications,3 we reported on our preliminary study of the homogeneous rate of decomposition of NH3 in a shock tube. We have subsequently improved our experimental procedures and in this paper we present the results of a new series of measurements which we believe gives more insight into the nature of the NH3 decomposition processes. Our basic technique of measurement remained as before, i.e., the infrared emission intensity of the 3 tl band of NH3 was recorded as a function of time. For judiciously chosen optical depths, the gas may be shown to be transparent, to a reasonable approximation, so that the emission intensity is proportional to the NH3 concentration. We abandoned, however, our earlier attempts to measure initial reaction rates by extrapolation to zero time. Instead we measured the NH3 concentration for a period of time behind the shock wave and then, by using the conventional integration methods, determined an apparent order of reaction. The difference in these measuring techniques may be inferred by reference to Fig. 1 which is reproduced from an actual experimental record. From the figure it can be seen that, due to the response time of the detector and associated electronics, linear extrapolation of the trace is likely to yield a considerable error in the initial slope; however, only a relatively small error is expected

FURTHER SHOCK-TUBE STUDIES BY INFRARED EMISSION OF THE DECOMPOSITION OF AMMONIA