Publisher description
Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: Chapter VII. American Photochemistry During 1933 and 1934. W. Albert Noyes, Jr., And A. B. F. Duncan, Department of Chemistry, Brown University. Photochemical research has been actively pursued in this country during the past two years. The general trend seems to be toward the study of simpler systems than formerly, with the object of obtaining valid reaction mechanisms and a correlation between spectroscopy and photochemistry. Space does not permit a survey of those spectroscopic developments of interest to photochemists, nor does it permit a survey of those spectroscopic studies which tend merely to elucidate the structure of molecules. We have confined our attention, therefore, to the field of photochemistry in the somewhat narrow range of photochemical reactions. Two books of interest to photochemists have appeared during the interval covered in this report. Laurens1 has surveyed the physiological effects of radiant energy in a very thorough manner and Mitchell and Zemansky 2 have treated the subject of resonance radiation and excited atoms, a field of prime interest to those dealing with photosensitized reactions. Reactions Involving Oxygen, Ozone and Hydrogen. A survey up to July, 1933, of work on the photochemical formation and decomposition of ozone has been made by Noyes.3 Forbes and Heidt 4 find a chain mechanism for photochemical ozone decomposition. The quantum yield increases with pressure of ozone, decreases with total pressure, is proportional to the square root of the concentration of water molecules and varies inversely as a fixed power (about 0.37) of the light intensity. Heidt and Forbes 5 find the quantum yield in photolysis of dry ozone at three wave lengths to be as high as 6.7, indicating an energy chain mechanism. Otherwise the behavior
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A Survey of American Chemistry
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