New x-ray wavelength reference table to be published. (General Developments).In January 1967, an x-ray wavelength table was published in Reviews of Modern Physics The Reviews of Modern Physics is a journal of the American Physical Society. The journal started in paper form. So far, the volumes from 1985 forward are also online, by subscription. Issue 1, Volume 1 consisted of the review by Raymond T. by the late J. A. Bearden (The Johns Hopkins University Johns Hopkins University, mainly at Baltimore, Md. Johns Hopkins in 1867 had a group of his associates incorporated as the trustees of a university and a hospital, endowing each with $3.5 million. Daniel C. ). For the past 35 years, it has been a standard reference in the field, reprinted in a number of standard reference books. However, scientists engaged in precision x-ray wavelength measurements have recognized for the past 10 years that important experimental and theoretical developments have created the need for a modern revision. NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. , in collaboration with theorists at the Ecole Normale Superieure (body) Ecole Normale Superieure - (ENS) A higher education and research institution in Paris, France. et Universite Pierre et Marie Curie Curie (kürē`), family of French scientists. Pierre Curie, 1859–1906, scientist, and his wife, Marie Sklodowska Curie, 1867–1934, chemist and physicist, b. (Paris) and Stockholm University Stockholm University (Stockholms universitet) is a state university in Stockholm, Sweden. It has about 37,000 students studying at four faculties. History In 1878, the university college Stockholm högskola , has developed a new, comprehensive x-ray wavelength reference table that has been accepted for publication in Reviews of Modern Physics (likely issue, January 2003). This is the culmination of a long-term NIST effort led by the late Richard Deslattes. The compilations contains K- and L x-ray transition and absorption edge energies for all of the elements from neon to fermium fermium (fûr`mēəm) [for Enrico Fermi], artificially produced radioactive chemical element; symbol Fm; at. no. 100; mass no. of most stable isotope 257; m.p. 1,527°C;; b.p. and sp. gr. unknown; valence +2, +3. and includes carefully selected and evaluated experimental data and trusted estimates obtained from state-of-the-art theoretical procedures. The new table makes use of the accurate linkage of x-ray wavelengths, optical wavelengths, and the SI definition of the meter made possible by combined x-ray and optical interferometry. It includes accurate measurements of specific x-ray reference lines, systematic studies of x-ray transitions and absorption edges, and other accurate x-ray wavelength measurements that have occurred since 1967. The table also reflects the continued development of physical theory that produces results in excellent agreement with high-quality experimental data. Theoretically predicted values of missing or poorly measured experimental data help to complete the reference. The new table also makes use of the most recent values of the fundamental physical constants. In addition to print publication, the new x-ray wavelength table will soon be available on the NIST Physical Reference Data Web site at http://physics.nist.gov/PhysRefData/contents.html. CONTACT: Ernest Kessler, (301) 975-4844; ernest.kessler@nist.gov. |
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