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Title: Studies in Moessbauer spectroscopy, neutron activation analysis, x-ray fluorescence

Abstract

The Moessbauer Effects was employed to study cyclopentadienyliron arene compounds. The isomer shift, delta, in these compounds ranges from 0.206 to 0.257 mm/s relative to /sup 5//sub 7/Co/Cu source and ..delta..E/sub Q/ values are from 1.632 to 1.918 mm/s at liquid nitrogen temperature. Room temperature spectra showed low absorption due to small recoil-free fractions the deltas and ..delta..E/sub Q/s can be correlated with the electron withdrawing effects of the alkyl groups bonded to benzene. In polynuclear aromatic system extending over two benzene rings, electron charge density is difficult to explain. Isomer shifts of PF/sub 6//sup -/ and Fe(NCS)/sub 6//sup 3 -/ are more or less independent of the counteranion, while ..delta..E/sub Q/ is slightly influenced by it. (Fe(arene)Cp)/sub 3//sup +/FE(NCS)/sub 6//sup 3 -/ compounds show only two peaks, with parameters almost identical to the PF/sub 6//sup -/ compounds. An isomer shift peak due to Fe(NCS)/sub 6//sup 3 -/, Fe d/sup 5/ state, is not observed and it is believed to coincide with the second right hand peak of the cation. Experimental procedures and results of hydrogen determination in samples of coal and other comparative samples, e.g., NA/sub 2/EDTA.2H/sub 2/O, in a paraffin moderated thermal neutron flux from 1 ..mu..Ci ofmore » /sup 252/Cf source are described. Simple instrumentation is used. Accuracy of about 10% or better is possible with stronger neutron source. Other moderators that were tried, but were unsuccessful, were water and graphite. Factors that can affect the neutron flux and prompt ..gamma..-ray distribution in the samples are H, O, and C concentrations. Results of the determination of uranium and other elements in sandstone uranium samples from Zambia are presented.« less

Authors:
Publication Date:
Research Org.:
Alabama Univ., Birmingham (USA)
OSTI Identifier:
5896123
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; CALIFORNIUM 252; NEUTRON SOURCES; COAL; RADIOCHEMICAL ANALYSIS; COBALT 57; MOESSBAUER EFFECT; CYCLOPENTADIENE; HYDROGEN; QUANTITATIVE CHEMICAL ANALYSIS; IRON COMPLEXES; SANDSTONES; CHEMICAL ANALYSIS; URANIUM; MODERATORS; PARAFFIN; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ACTINIDES; ALKANES; ALKENES; ALPHA DECAY RADIOISOTOPES; BETA DECAY RADIOISOTOPES; CALIFORNIUM ISOTOPES; CARBONACEOUS MATERIALS; COBALT ISOTOPES; COMPLEXES; CYCLOALKENES; DAYS LIVING RADIOISOTOPES; DIENES; ELECTRON CAPTURE RADIOISOTOPES; ELEMENTS; ENERGY SOURCES; EVEN-EVEN NUCLEI; FOSSIL FUELS; FUELS; HEAVY NUCLEI; HYDROCARBONS; INTERMEDIATE MASS NUCLEI; ISOTOPES; MATERIALS; METALS; NONMETALS; NUCLEI; ODD-EVEN NUCLEI; ORGANIC COMPOUNDS; OTHER ORGANIC COMPOUNDS; PARTICLE SOURCES; POLYENES; RADIATION SOURCES; RADIOISOTOPES; ROCKS; SEDIMENTARY ROCKS; TRANSITION ELEMENT COMPLEXES; WAXES; YEARS LIVING RADIOISOTOPES; 400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987); 400600 - Radiation Chemistry; 400702 - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials; 400201 - Chemical & Physicochemical Properties

Citation Formats

Nomai, M. Studies in Moessbauer spectroscopy, neutron activation analysis, x-ray fluorescence. United States: N. p., 1985. Web.
Nomai, M. Studies in Moessbauer spectroscopy, neutron activation analysis, x-ray fluorescence. United States.
Nomai, M. 1985. "Studies in Moessbauer spectroscopy, neutron activation analysis, x-ray fluorescence". United States.
@article{osti_5896123,
title = {Studies in Moessbauer spectroscopy, neutron activation analysis, x-ray fluorescence},
author = {Nomai, M},
abstractNote = {The Moessbauer Effects was employed to study cyclopentadienyliron arene compounds. The isomer shift, delta, in these compounds ranges from 0.206 to 0.257 mm/s relative to /sup 5//sub 7/Co/Cu source and ..delta..E/sub Q/ values are from 1.632 to 1.918 mm/s at liquid nitrogen temperature. Room temperature spectra showed low absorption due to small recoil-free fractions the deltas and ..delta..E/sub Q/s can be correlated with the electron withdrawing effects of the alkyl groups bonded to benzene. In polynuclear aromatic system extending over two benzene rings, electron charge density is difficult to explain. Isomer shifts of PF/sub 6//sup -/ and Fe(NCS)/sub 6//sup 3 -/ are more or less independent of the counteranion, while ..delta..E/sub Q/ is slightly influenced by it. (Fe(arene)Cp)/sub 3//sup +/FE(NCS)/sub 6//sup 3 -/ compounds show only two peaks, with parameters almost identical to the PF/sub 6//sup -/ compounds. An isomer shift peak due to Fe(NCS)/sub 6//sup 3 -/, Fe d/sup 5/ state, is not observed and it is believed to coincide with the second right hand peak of the cation. Experimental procedures and results of hydrogen determination in samples of coal and other comparative samples, e.g., NA/sub 2/EDTA.2H/sub 2/O, in a paraffin moderated thermal neutron flux from 1 ..mu..Ci of /sup 252/Cf source are described. Simple instrumentation is used. Accuracy of about 10% or better is possible with stronger neutron source. Other moderators that were tried, but were unsuccessful, were water and graphite. Factors that can affect the neutron flux and prompt ..gamma..-ray distribution in the samples are H, O, and C concentrations. Results of the determination of uranium and other elements in sandstone uranium samples from Zambia are presented.},
doi = {},
url = {https://www.osti.gov/biblio/5896123}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1985},
month = {Tue Jan 01 00:00:00 EST 1985}
}

Thesis/Dissertation:
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