Atomic weights of the elements 2013 (IUPAC Technical Report)

Atomic weights of the elements 2013 (IUPAC Technical Report)
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DOI:
10.1515/pac-2015-0305
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发表时间:
2016-03-01
影响因子:
1.8
通讯作者:
Prohaska, Thomas
Prohaska, Thomas
中科院分区:
化学4区
文献类型:
--
作者:
Meija, Juris;Coplen, Tyler B.;Prohaska, Thomas

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对原子量测定和其他同源数据的两年期审查导致19种元素的标准原子量发生变化。根据最近对天然地球物质同位素丰度的测定,四种元素的标准原子量已被修订:镉从112.411(8)修订为112.414(4),钼从95.96(2)修订为95.95(1),硒从78.96(3)修订为78.971(8),钍从232.038 06(2)修订为232.0377(4)。(claaw.org)还根据2012年原子质量评估修订了15种元素的标准原子量:铝(铝)从26.981 5386(8)降至26.981 5385(7),砷从74.921 60(2)降至74.921 595(6),铍从9.012 182(3)降至9.012 1831(5),铯(铯)从132.905 4519(2)降至132.905 451 96(6),钴从58.933 195(5)降至58.933 194(4),氟从18.998 4032(5)降至18.998 403 163(6),金从196.966 569(4)升至196.966 569(5),钬从164.930 32(2)升至164.930 33(2),锰从54.938 045(5)升至54.938 044(3),铌从92.906 38(2)升至92.906 37(2),磷从30.973 762(2)降至30.973 761 998(5),镨从140.907 65(2)降至140.907 66(2),钪从44.955 912(6)降至44.955 908(5),铥从168.934 21(2)降至168.934 22(2),委员会还建议将天然陆地铀同位素比的标准值N(U-238)/N(U-235)= 137.8(1)。
The biennial review of atomic-weight determinations and other cognate data has resulted in changes for the standard atomic weights of 19 elements. The standard atomic weights of four elements have been revised based on recent determinations of isotopic abundances in natural terrestrial materials:cadmium to 112.414(4) from 112.411(8),molybdenum to 95.95(1) from 95.96(2),selenium to 78.971(8) from 78.96(3), andthorium to 232.0377(4) from 232.038 06(2).The Commission on Isotopic Abundances and Atomic Weights (claaw.org) also revised the standard atomic weights of fifteen elements based on the 2012 Atomic Mass Evaluation:aluminium (aluminum) to 26.981 5385(7) from 26.981 5386(8),arsenic to 74.921 595(6) from 74.921 60(2),beryllium to 9.012 1831(5) from 9.012 182(3),caesium (cesium) to 132.905 451 96(6) from 132.905 4519(2),cobalt to 58.933 194(4) from 58.933 195(5),fluorine to 18.998 403 163(6) from 18.998 4032(5),gold to 196.966 569(5) from 196.966 569(4),holmium to 164.930 33(2) from 164.930 32(2),manganese to 54.938 044(3) from 54.938 045(5),niobium to 92.906 37(2) from 92.906 38(2),phosphorus to 30.973 761 998(5) from 30.973 762(2),praseodymium to 140.907 66(2) from 140.907 65(2),scandium to 44.955 908(5) from 44.955 912(6),thulium to 168.934 22(2) from 168.934 21(2), andyttrium to 88.905 84(2) from 88.905 85(2).The Commission also recommends the standard value for the natural terrestrial uranium isotope ratio, N(U-238)/N(U-235) = 137.8(1).