. The American journal of roentgenology, radium therapy and nuclear medicine . phic representation of the resolved wave-lengths may be called an .r-ray spectrum. a. Line Series Due to Crystalline Structure If in the crystal there is any regular ar-rangement of atoms, it should be possible tohave several sets of parallel planes. The dis-tance between planes in any one set is the *Read before the Second Annual Meeting of the Central Section of The American Roentgen Ray Society, St. Louis, Mo., February 21, 1921. 393 394 X-Ray Spectra and Structure of Matter same, but it is different from that be
. The American journal of roentgenology, radium therapy and nuclear medicine . phic representation of the resolved wave-lengths may be called an .r-ray spectrum. a. Line Series Due to Crystalline Structure If in the crystal there is any regular ar-rangement of atoms, it should be possible tohave several sets of parallel planes. The dis-tance between planes in any one set is the *Read before the Second Annual Meeting of the Central Section of The American Roentgen Ray Society, St. Louis, Mo., February 21, 1921. 393 394 X-Ray Spectra and Structure of Matter same, but it is different from that betweenmembers of any other set. Now if a crystalis mounted with careful reference to theposition of its atomic planes and is subjectedto a beam of .t--rays with only one wave-length, when the crystal is rotated a reflected ray beam of a single wave-length, all the pos-sible plane sets are exposed and all the pos-sible lines appear simultaneously on theplate. These lines are due to and characteris-tic of the atomic arrangement in the crystal-line structure of the powder Fig. I. Diagram of the .v-ray spectrometer.
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