{"id":{"repo_id":"uab","oai_identifier":"oai:digitalcommons.library.uab.edu:etd-collection-7941"},"canonical_url":"https://search.dev.ndltd.org/etd/uab/oai:digitalcommons.library.uab.edu:etd-collection-7941","repository":{"repo_id":"uab","name":"University of Alabama Birmingham","base_url":"https://digitalcommons.library.uab.edu/do/oai/"},"display":{"title":"Production of Ultra-Thick Sodium Nitroprusside Absorbers for the Determination of Mössbauer Transmission Integral Parameters.","abstract":"At the 1974 Moessbauer Methodology Symposium, a paper by Agresti et al., introduced a novel method for determining recoil-free fractions, namely, the spectra of a series of thicknesses of absorbers are fitted simultaneously under a least squares minimization criterion to the transmission integral. This technique, when applied to 151Eu (source) and EU2O3 (absorber) to determine their recoil-free fractions, produced internally consistent values for these parameters. However, verification of the values obtained was not easily accomplished due to the lack of literature for comparison. It has been the objective of the research reported here to make a series of absorbers which could be used to verify the validity of the simultaneous fitting method. The material chosen from which to make the absorbers must have its recoil-free fraction known to a high degree of precision. Such a material is disodium pentacyanonitrosylferrate(II) or as it is commonly labelled, sodium nitroprusside—SNP.","abstract_html":"At the 1974 Moessbauer Methodology Symposium, a paper by Agresti et al., introduced a novel method for determining recoil-free fractions, namely, the spectra of a series of thicknesses of absorbers are fitted simultaneously under a least squares minimization criterion to the transmission integral. This technique, when applied to 151Eu (source) and EU2O3 (absorber) to determine their recoil-free fractions, produced internally consistent values for these parameters. However, verification of the values obtained was not easily accomplished due to the lack of literature for comparison. It has been the objective of the research reported here to make a series of absorbers which could be used to verify the validity of the simultaneous fitting method. The material chosen from which to make the absorbers must have its recoil-free fraction known to a high degree of precision. Such a material is disodium pentacyanonitrosylferrate(II) or as it is commonly labelled, sodium nitroprusside—SNP.","abstract_has_math":false,"creators":["O'Brien, George Phillips"],"institution":null,"degree_name":null,"degree_level":"Thesis","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1976,"date_issued":"1976-01-01T08:00:00Z","date_published":"1976-01-01T08:00:00Z","updated_at":"2026-07-24T05:05:40Z","subjects":["Mössbauer methodology","Recoil-free fractions","Sodium nitroprusside"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.library.uab.edu/etd-collection/6949","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["O'Brien, George Phillips"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Mössbauer methodology","Recoil-free fractions","Sodium nitroprusside"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalcommons.library.uab.edu/etd-collection/6949"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["At the 1974 Moessbauer Methodology Symposium, a paper by Agresti et al., introduced a novel method for determining recoil-free fractions, namely, the spectra of a series of thicknesses of absorbers are fitted simultaneously under a least squares minimization criterion to the transmission integral. This technique, when applied to 151Eu (source) and EU2O3 (absorber) to determine their recoil-free fractions, produced internally consistent values for these parameters. However, verification of the values obtained was not easily accomplished due to the lack of literature for comparison. It has been the objective of the research reported here to make a series of absorbers which could be used to verify the validity of the simultaneous fitting method. The material chosen from which to make the absorbers must have its recoil-free fraction known to a high degree of precision. Such a material is disodium pentacyanonitrosylferrate(II) or as it is commonly labelled, sodium nitroprusside—SNP."]},{"key":"dc:title","label":"Title","values":["Production of Ultra-Thick Sodium Nitroprusside Absorbers for the Determination of Mössbauer Transmission Integral Parameters."]}]}],"canonical_facts":{"dc:creator":["O'Brien, George Phillips"],"dc:description.abstract":["At the 1974 Moessbauer Methodology Symposium, a paper by Agresti et al., introduced a novel method for determining recoil-free fractions, namely, the spectra of a series of thicknesses of absorbers are fitted simultaneously under a least squares minimization criterion to the transmission integral. This technique, when applied to 151Eu (source) and EU2O3 (absorber) to determine their recoil-free fractions, produced internally consistent values for these parameters. However, verification of the values obtained was not easily accomplished due to the lack of literature for comparison. It has been the objective of the research reported here to make a series of absorbers which could be used to verify the validity of the simultaneous fitting method. The material chosen from which to make the absorbers must have its recoil-free fraction known to a high degree of precision. Such a material is disodium pentacyanonitrosylferrate(II) or as it is commonly labelled, sodium nitroprusside—SNP."],"dc:identifier":["https://digitalcommons.library.uab.edu/etd-collection/6949"],"dc:subject":["Mössbauer methodology","Recoil-free fractions","Sodium nitroprusside"],"dc:title":["Production of Ultra-Thick Sodium Nitroprusside Absorbers for the Determination of Mössbauer Transmission Integral Parameters."],"thesis:degree_level":["Thesis"]},"updated_at":"2026-07-24T05:05:40Z"}