Abstract

The linear absorption coefficient of celluloid has been measured between 300A and 1000A and found to reach a maximum value of 1.1×106 per cm at 800A where a film 100A thick transmits 30 percent. The reflecting power of celluloid mirrors at various angles of incidence has been measured for six wave lengths in this region. From these reflection power curves and extinction coefficients, by using Fresnel’s equations the refractive indices have been calculated for these wave lengths. The dispersion curve passes through unity at 800A, reaches a minimum at 550A and is approaching unity again at 400A. The total absorption between 300A and 3000A accounts for 126 electrons per molecule of cellulose nitrate. Exclusive of the K electrons of carbon, nitrogen, and oxygen, which show absorption near 40A, there are 192 electrons per molecule.

© 1932 Optical Society of America

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