The photolysis of N2O at 1470 Å

✍ Scribed by Marcia C. Dodge; Julian Heicklen

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 676 KB
• Volume: 3
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550030307

✦ Synopsis

The photolysis of pure NzO, NzO and Nz, and N20 and C3Hs mixtures at 1470 A and room temperature has been studied to determine the relative importance of the primary processes. The results are

TI) where +{ O('D) ] = 0.515 represents both the O(lD) produced in the primary act and that produced by collisional quenching of O(lS); 4(N2(3Z)) = 0.084 represents only that portion of N2(3X) which dissociates N2O on deactivation; and +{O(lS)) = 0.38 -+(N(*D)} represents only that portion of O(%) which enters into chemical reaction with NzO. If the reaction of O(lS) with N2O yields only Nt and O2 as products, which seem likely from potential-energy curve considerations, then +(O(lS)) = 0.135 f 0.06 and +(N(*D)] = 0.245 f 0.06. Young and coworkers [4] have found from spectroscopic observations that the total quantum yield of O( 1S) is about 0.5. Thus it can be concluded that collisional removal of O(%) by NzO yields mainly O(lD) with chemical reaction being less important. Furthermore, most of the O(lD) is produced this way, and the true primary yield of O(1D) is about 0.15. The metastable N(2D) is not deactivated by N20, but is removed by chemical reaction to produce Nz and NO. The results further indicate that N2(3X) dissociates N20 at least 80% of the time during quenching. The relative efficiency of NzO compared to N2 is about 2 for the removal of O(lD). O(1S) is removed about 90 times as efficiently by C3Ha as by N2O.