Average Land M-shell-vacancy distributions produced in the deexcitation of atoms that have been singly ionized in the K shell or one of the L subshells are derived from a comprehensive set of available experimental and theoretical data on radiativeand Auger-transition rates. The data are supplemented by new calculations in j-j coupling from nonrelativistic screened hydrogenic wave functions of the following radiationless transition rates; K-LL, K-LM, and K-LN for selected elements with 20 -Z&8]. , and L&-MM, L;-MX, and L;-XY for 26 «Z~9 3. Experimental and theoretical data on Augerand radiative-transition probabilities are critically compared. Auger-electron intensity ratios and K@2/Kn& and KP/Ko. x-ray intensity ratios from a best fit to experimental data are tabulated for even atomic numbers from 20 to 94. The probability, per initial K vacancy, of vacancy production in each L; subshell is derived from experimental data and tabulated for 20~Z~94; components due to Auger and xray transitions are listed separately. These probabilities agree well with purely theoretical vacancy distributions also derived here. The probability of M-shell -, vacancy production in the decay of K and L& vacancies is derived from theory and tabulated for selected atoms with 16~Z~93.
A novel norditerpenoid, horiolide (1), has been isolated from an Indian Ocean soft coral of the genus Sinularia. The structural elucidation was achieved by a study of its spectral characteristics. This compound is structurally characterized by a new carbon skeleton having one six-membered cyclohexane ring bearing an isopropylene moiety, a carbonyl group, and one seven-membered ring attached to a five-membered lactone moiety.
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