Low even configurations of the first spectrum of molybdenum (MoI)
1952; US government; Volume: 49; Issue: 6 Linguagem: Inglês
10.6028/jres.049.043
ISSN2376-5305
AutoresR. E. Trees, Marie‐Eve Harvey,
Tópico(s)Crystal Structures and Properties
ResumoThe analysis of the first spectru m of molybdenum has been extended by the classifi cation of approximately 3,000 additional lines ari sing from combinations including 44 new even levels a nd 190 new odd levels that h ave been located .The identification of those levels that belong to the three low even configurations, 4d 4 58 2 , 4d 5 58, and 4d6, is given.Som e unpublished levels found earlier by C .C .Kiess are included.Assignment of the terms to the three low even configurations has been aided by a theoretical calculation .Over-all agreement is very good, as indicated by a mean deviation of ± 168 cm-1 between theory and experiment.The calculation is prcsent ed in a simplified and detailed form, which may h elp in applying the theory to future analyses.The theoretical calculation assumes LS-coupling and takes into a ccount th c electr ostatic inter action between the t hree configurations.Exccllent co nfirma tion of the theory of configuration interaction is obtained because the interaction is very strong in Mo 1. Difficulties in assigning a term to a con fi guration are di scussed and tentatively resolved by t he u se of the calculation .I n the 3d5 48 configuration of Fe IIr, Trees h as shown that polarization can bc accounted fOJ" by an empirical correction proportional to L (L + 1).The applicability of this correction in the 4d 5 58 confi guration of Mo I is demon str ated .The corr ection is on ly about h alf as important in 1 \110 I as it is in Fe IIr, so that Mo I is not we ll suited for a detailed study of polarization effects.However , the agr ee ment obtained is so me confiJ"mation of R acah 's assu mpt ion that polar ization can be treated linearly.M agn etic interactions are considered bricfl y in an effor t to explain di sagreements between theory a nd exp erimcnt, and to illustrate a dditional diffi culties that a ri se in the a ssignment of term designations.' Almost 190 new odd le\-el s have been discovered so that the total number of known odd levels is now about 230.'[' he odd le\' els will be included in a complete description and analysis of Nro 1 to be published later.4rl5(6S) 58 (I, 78 *0.0 4d5(6R) 58 a 5S *10768. 2 .J.d' 58 z as ]) *10965.9176. 9 *11142.8 *11 454.4
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