The results with the single line 2190 8. throw some doubt on one widely quoted result of Kuhn's measurements. His yield of 0.45 was obtained using all four zinc lines at 2026, 2062, 2100 and 2138 A. On using pure, monochromatic light of X 2062 A. Kuhn found a yield of only 0.10. The photolysis was carried out in a vessel which had its quartz windows held onto the walls by a cement and the reaction was followed by measuring the increase in the total ...
