Vol. 71 made up by weight in «-heptane which had been cleaned so as to transmit in our 0.013-cm. cells to 1700 A.9Acknowledgment.-We are indebted to Prof. Weldon G. Brown for supplying the compounds and to Prof. R. S. Mulliken and to C. C. J. Roothaan for helpful discussions on the interpretation of the spectra. Mrs. Dorothy Iker Lossy assisted ably in photometering the plates and reducing the data.
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