{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23912"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23912","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Single particle kinetic energies of para-hydrogen molecules in para-hydrogen and argon solids","abstract":"Single particle kinetic energies of para-hydrogen molecules in para-hydrogen and argon solids have been determined by deep inelastic neutron scattering. The Low Resolution Medium ~nergy Chopper Spectrometer at the Argonne National Laboratory's Intense Pulsed Neutron Source was used to make the measurements at momentum transfers up to 12 A-I. Peaks corresponding to transitions from the molecule's rotational ground state J =0 to the excited states J =1,3, and 5 are observed. The peaks are broadened by the translational center of mass motion of the molecule. A new technique for analyzing data taken with a chopper spectrometer at a pulsed source is implemented. This method employs a numerically determined resolution function. Single particle kinetic energies for solid para-hydrogen are found to be 92.6 ± 1.1, 108.9 ± 4, 129.9 ± 5, and 145.8 ± 4 K for molar volumes of 23.2, 21.26, 19.49, and 18.16 cc/mole respectively. These values are shown to be those of the ground state. This measurement is the first of its kind to span such a large range of molar volumes. The scattering from dilute para-hydrogen molecules embedded in solid argon has also been measured. The single particle kinetic energies are found to be 84.4 iv ± 4, 118.3 ± 5, and 147.6 ± 3 K for a sample at temperatures of 34.2, 54.1, and 74.0 K respectively. These data show the same peak structure as did the solid para-hydrogen experiment.","abstract_html":"Single particle kinetic energies of para-hydrogen molecules in para-hydrogen and argon solids have been determined by deep inelastic neutron scattering. The Low Resolution Medium ~nergy Chopper Spectrometer at the Argonne National Laboratory's Intense Pulsed Neutron Source was used to make the measurements at momentum transfers up to 12 A-I. Peaks corresponding to transitions from the molecule's rotational ground state J =0 to the excited states J =1,3, and 5 are observed. The peaks are broadened by the translational center of mass motion of the molecule. A new technique for analyzing data taken with a chopper spectrometer at a pulsed source is implemented. This method employs a numerically determined resolution function. Single particle kinetic energies for solid para-hydrogen are found to be 92.6 ± 1.1, 108.9 ± 4, 129.9 ± 5, and 145.8 ± 4 K for molar volumes of 23.2, 21.26, 19.49, and 18.16 cc/mole respectively. These values are shown to be those of the ground state. This measurement is the first of its kind to span such a large range of molar volumes. The scattering from dilute para-hydrogen molecules embedded in solid argon has also been measured. The single particle kinetic energies are found to be 84.4 iv ± 4, 118.3 ± 5, and 147.6 ± 3 K for a sample at temperatures of 34.2, 54.1, and 74.0 K respectively. These data show the same peak structure as did the solid para-hydrogen experiment.","abstract_has_math":false,"creators":["Herwig, Kenneth William"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Simmons, R.O."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-17T15:30:51Z","date_published":"2011-05-17T15:30:51Z","updated_at":"2026-07-22T22:25:22Z","subjects":["single particle kinetic energies","para-hydrogen molecules","argon solids","deep inelastic neutron scattering","Low Resolution Medium Energy Chopper Spectrometer","Argonne","Intense Pulsed Neutron Source"],"languages":["en"],"rights":["1988 Kenneth William Herwig"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["3478218"],"render_values":[{"text":"3478218","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23912","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Simmons, R.O."]},{"key":"dc:creator","label":"Author","values":["Herwig, Kenneth William"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-17T15:30:51Z","10000-01-01","1988"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["single particle kinetic energies","para-hydrogen molecules","argon solids","deep inelastic neutron scattering","Low Resolution Medium Energy Chopper Spectrometer","Argonne","Intense Pulsed Neutron Source"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1988 Kenneth William Herwig"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["3478218","http://hdl.handle.net/2142/23912"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Single particle kinetic energies of para-hydrogen molecules in para-hydrogen and argon solids have been determined by deep inelastic neutron scattering. The Low Resolution Medium ~nergy Chopper Spectrometer at the Argonne National Laboratory's Intense Pulsed Neutron Source was used to make the measurements at momentum transfers up to 12 A-I. Peaks corresponding to transitions from the molecule's rotational ground state J =0 to the excited states J =1,3, and 5 are observed. The peaks are broadened by the translational center of mass motion of the molecule. A new technique for analyzing data taken with a chopper spectrometer at a pulsed source is implemented. This method employs a numerically determined resolution function. Single particle kinetic energies for solid para-hydrogen are found to be 92.6 ± 1.1, 108.9 ± 4, 129.9 ± 5, and 145.8 ± 4 K for molar volumes of 23.2, 21.26, 19.49, and 18.16 cc/mole respectively. These values are shown to be those of the ground state. This measurement is the first of its kind to span such a large range of molar volumes. The scattering from dilute para-hydrogen molecules embedded in solid argon has also been measured. The single particle kinetic energies are found to be 84.4 iv ± 4, 118.3 ± 5, and 147.6 ± 3 K for a sample at temperatures of 34.2, 54.1, and 74.0 K respectively. These data show the same peak structure as did the solid para-hydrogen experiment.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-17T15:30:51Z No. of bitstreams: 1 1988_herwig.pdf: 3568782 bytes, checksum: 737c010b898b7e5d462c5a5ac499c646 (MD5)","Made available in DSpace on 2011-05-17T15:30:51Z (GMT). No. of bitstreams: 1 1988_herwig.pdf: 3568782 bytes, checksum: 737c010b898b7e5d462c5a5ac499c646 (MD5) Previous issue date: 1988","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-17T15:30:51Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:10-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Single particle kinetic energies of para-hydrogen molecules in para-hydrogen and argon solids"]}]}],"canonical_facts":{"dc:contributor":["Simmons, R.O."],"dc:creator":["Herwig, Kenneth William"],"dc:date":["2011-05-17T15:30:51Z","10000-01-01","1988"],"dc:description":["Single particle kinetic energies of para-hydrogen molecules in para-hydrogen and argon solids have been determined by deep inelastic neutron scattering. The Low Resolution Medium ~nergy Chopper Spectrometer at the Argonne National Laboratory's Intense Pulsed Neutron Source was used to make the measurements at momentum transfers up to 12 A-I. Peaks corresponding to transitions from the molecule's rotational ground state J =0 to the excited states J =1,3, and 5 are observed. The peaks are broadened by the translational center of mass motion of the molecule. A new technique for analyzing data taken with a chopper spectrometer at a pulsed source is implemented. This method employs a numerically determined resolution function. Single particle kinetic energies for solid para-hydrogen are found to be 92.6 ± 1.1, 108.9 ± 4, 129.9 ± 5, and 145.8 ± 4 K for molar volumes of 23.2, 21.26, 19.49, and 18.16 cc/mole respectively. These values are shown to be those of the ground state. This measurement is the first of its kind to span such a large range of molar volumes. The scattering from dilute para-hydrogen molecules embedded in solid argon has also been measured. The single particle kinetic energies are found to be 84.4 iv ± 4, 118.3 ± 5, and 147.6 ± 3 K for a sample at temperatures of 34.2, 54.1, and 74.0 K respectively. These data show the same peak structure as did the solid para-hydrogen experiment.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-17T15:30:51Z No. of bitstreams: 1 1988_herwig.pdf: 3568782 bytes, checksum: 737c010b898b7e5d462c5a5ac499c646 (MD5)","Made available in DSpace on 2011-05-17T15:30:51Z (GMT). No. of bitstreams: 1 1988_herwig.pdf: 3568782 bytes, checksum: 737c010b898b7e5d462c5a5ac499c646 (MD5) Previous issue date: 1988","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-17T15:30:51Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:10-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["3478218","http://hdl.handle.net/2142/23912"],"dc:language":["en"],"dc:rights":["1988 Kenneth William Herwig"],"dc:subject":["single particle kinetic energies","para-hydrogen molecules","argon solids","deep inelastic neutron scattering","Low Resolution Medium Energy Chopper Spectrometer","Argonne","Intense Pulsed Neutron Source"],"dc:title":["Single particle kinetic energies of para-hydrogen molecules in para-hydrogen and argon solids"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:22Z"}