10 Gas Kinetics Introduction THE general format of this section will follow that adopted last year i.e. the subject is subdivided into two parts atoms and small radicals and large radicals and molecules. The Reports cover those papers published in the past year up to approximately mid-December 1969. Although when considering rate constants there is a temptation to equate ‘new’ with ‘better’ this is not necessarily the case since we have made no attempt to select best values of Arrhenius parameters. Noteworthy additions in the general area of gas kinetics include a new journal, ‘The International Journal of Chemical Kinetics,” which provides a new outlet for papers that ‘explore the quantitative relationship between structure and reactivity’ and Volumes 1 and 2 of ‘Comprehensive Chemical Kinetics’.’ ’ International Journal of Chemical Kinetics ed. S . W. Benson Interscience New York. ‘Comprehensive Chemical Kinetics,’ ed. C. H. Bamford and C. F. H. Tipper Elsevier, Amsterdam 1969