The Photochemical Decomposition of Hydrogen-Iodide; the Mode of Optical Dissociation.

to affect the chemical bonds insofar as they depend upon the exact positions and shapes of the orbits. Such a change in the chemical bond would affect the reaction velocity exponentially. The present negative results are, therefore, not without interest. They are in accord with the results of Steubing,3 who found that fields of the same magnitude did not cause shifts in certain band spectra. The writer wishes to express his best thanks to Prof. W. D. Bancroft and to Prof. F. K. Richtmeyer for their interest and for valuable suggestions. * NATIONAL RZ3SARCH F}LLOW. 1 J. Phys. Chem., 30, 1134 (1926). 2 Proc. Nat. Acad. Sci., 13, 67 (1927). 3 Steubing, Phys. Zeits., 23, 427 (1922); 26, 915 (1925).