Letter | Published:

Remarkable Optical Properties of the Alkali Metals

Nature volume 131, page 582 (22 April 1933) | Download Citation



MARCH 28.—Supplementing my letter of March 20 on the remarkable optical properties of the alkali metals in the ultra-violet region, I am now able to state that my prediction that potassium would show a Brewsterian angle of plane polarisation in the region below 2700 A. has been verified. The angle found for 2500 A. was 37°, which makes the refractive index n = 0.75. I am not yet sure how accurately the angle can be determined, or how complete the polarisation is, but the intensity ratio of the two images obtained with a quartz Rochon prism was 1 : 120. The images had equal intensity in the visible and near ultra-violet.

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