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according agreement angle appears approximation assumed assumption atomic bands becomes calculated centre compared components compounds considerable considered constant corresponding curve cylinder depend determined direction distance distribution doublets edge effect electrical electron elements energy equal equation excited experiments expression fact factor field focal force formula frequency fringes function further give given heat increases integral intensity ions latter length lens less light mass means measured method molecules motion moving observed obtained origin pass Phil plane Plate position possible potential practically present pressure probably problem produced radius ratio rays reflected regard relation represent respectively ring seen shown shows solution sphere suppose surface Table taken temperature theory velocity vibrations wave-length wind zero