{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/95276"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/95276","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Three dimensional vibrational spectroscopy and shock initiation of hmx","abstract":"3D spectroscopy was employed to probe and visualize energy flows through molecules from excited parent states. Studies with IR-Raman pump probe spectroscopy show clearly that the characteristics of the vibrational relaxation pathway depend strongly upon the initial excited states. By employing 3D spectroscopy, it is possible to track and visualize relaxation pathways for an entire range of parent states, providing a better understanding of intramolecular energy transfer. Laser driven shocks and sum frequency generation spectroscopy were used to attempt to observe the mechanisms of initiation for HMX. Those first bond breaking events are poorly understood, and much could be learned from experimental observation. Much refinement of the sample design was done, but there was still no events observed by SFG that were clearly attributable to HMX initiation. No broadening or new peaks were observed at all, and no significant loss of SFG intensity occurred besides the expected loss from the destruction of the aluminum substrate. It is possible that a more uniform and better made sample, perhaps along with significantly more laser power, could successfully observe initiation. Flyer driven shocks and emission spectroscopy were used to determine the relative shock sensitivities of delta and beta HMX, as well as investigate the first nanoseconds after shock compression for HMX. While previous studies by the Dlott group have observed interesting phenomena in those first nanoseconds to microseconds after shock, those studies were done on beta HMX. Similar experiments were done on delta HMX, and it exhibits similar behavior initially with a very high temperature spike, though later behavior is not identical.","abstract_html":"3D spectroscopy was employed to probe and visualize energy flows through molecules from excited parent states. Studies with IR-Raman pump probe spectroscopy show clearly that the characteristics of the vibrational relaxation pathway depend strongly upon the initial excited states. By employing 3D spectroscopy, it is possible to track and visualize relaxation pathways for an entire range of parent states, providing a better understanding of intramolecular energy transfer. Laser driven shocks and sum frequency generation spectroscopy were used to attempt to observe the mechanisms of initiation for HMX. Those first bond breaking events are poorly understood, and much could be learned from experimental observation. Much refinement of the sample design was done, but there was still no events observed by SFG that were clearly attributable to HMX initiation. No broadening or new peaks were observed at all, and no significant loss of SFG intensity occurred besides the expected loss from the destruction of the aluminum substrate. It is possible that a more uniform and better made sample, perhaps along with significantly more laser power, could successfully observe initiation. Flyer driven shocks and emission spectroscopy were used to determine the relative shock sensitivities of delta and beta HMX, as well as investigate the first nanoseconds after shock compression for HMX. While previous studies by the Dlott group have observed interesting phenomena in those first nanoseconds to microseconds after shock, those studies were done on beta HMX. Similar experiments were done on delta HMX, and it exhibits similar behavior initially with a very high temperature spike, though later behavior is not identical.","abstract_has_math":false,"creators":["Sun, Yuxiao"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":["Dlott, Dana","Gruebele, Martin","McCall, Ben","Suslick, Ken"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-03-01T15:46:01Z","date_published":"2017-03-01T15:46:01Z","updated_at":"2026-07-22T22:26:35Z","subjects":["Spectroscopy","HMX","Shock"],"languages":["en"],"rights":["Copyright 2016 Yuxiao Sun"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/95276","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dlott, Dana","Gruebele, Martin","McCall, Ben","Suslick, Ken"]},{"key":"dc:creator","label":"Author","values":["Sun, Yuxiao"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-03-01T15:46:01Z","2016-09-07","2016-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Spectroscopy","HMX","Shock"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2016 Yuxiao Sun"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/95276"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["3D spectroscopy was employed to probe and visualize energy flows through molecules from excited parent states. Studies with IR-Raman pump probe spectroscopy show clearly that the characteristics of the vibrational relaxation pathway depend strongly upon the initial excited states. By employing 3D spectroscopy, it is possible to track and visualize relaxation pathways for an entire range of parent states, providing a better understanding of intramolecular energy transfer. Laser driven shocks and sum frequency generation spectroscopy were used to attempt to observe the mechanisms of initiation for HMX. Those first bond breaking events are poorly understood, and much could be learned from experimental observation. Much refinement of the sample design was done, but there was still no events observed by SFG that were clearly attributable to HMX initiation. No broadening or new peaks were observed at all, and no significant loss of SFG intensity occurred besides the expected loss from the destruction of the aluminum substrate. It is possible that a more uniform and better made sample, perhaps along with significantly more laser power, could successfully observe initiation. Flyer driven shocks and emission spectroscopy were used to determine the relative shock sensitivities of delta and beta HMX, as well as investigate the first nanoseconds after shock compression for HMX. While previous studies by the Dlott group have observed interesting phenomena in those first nanoseconds to microseconds after shock, those studies were done on beta HMX. Similar experiments were done on delta HMX, and it exhibits similar behavior initially with a very high temperature spike, though later behavior is not identical.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-02-28 without embargo terms","The student, Yuxiao Sun, accepted the attached license on 2016-09-02 at 21:19.","The student, Yuxiao Sun, submitted this Dissertation for approval on 2016-09-02 at 21:23.","This Dissertation was approved for publication on 2016-09-07 at 08:59.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10143 on 2017-02-28 at 14:45:52","Made available in DSpace on 2017-03-01T15:46:01Z (GMT). No. of bitstreams: 4 SUN-DISSERTATION-2016.pdf: 5656683 bytes, checksum: e07f1eaaf72c2b34a9d5a8748d5847ea (MD5) ACS Policy.pdf: 91169 bytes, checksum: 8bb2d0e7f47b406e1f6e755f3d3f9f54 (MD5) LICENSE.txt: 4207 bytes, checksum: d45f9913fe0aaaca8831469c1a9ab764 (MD5) PROQUEST_LICENSE.txt: 4553 bytes, checksum: 377752bec2f0e5e5d9dde24c9c42ba54 (MD5) Previous issue date: 2016-09-07"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Three dimensional vibrational spectroscopy and shock initiation of hmx"]}]}],"canonical_facts":{"dc:contributor":["Dlott, Dana","Gruebele, Martin","McCall, Ben","Suslick, Ken"],"dc:creator":["Sun, Yuxiao"],"dc:date":["2017-03-01T15:46:01Z","2016-09-07","2016-12"],"dc:description":["3D spectroscopy was employed to probe and visualize energy flows through molecules from excited parent states. Studies with IR-Raman pump probe spectroscopy show clearly that the characteristics of the vibrational relaxation pathway depend strongly upon the initial excited states. By employing 3D spectroscopy, it is possible to track and visualize relaxation pathways for an entire range of parent states, providing a better understanding of intramolecular energy transfer. Laser driven shocks and sum frequency generation spectroscopy were used to attempt to observe the mechanisms of initiation for HMX. Those first bond breaking events are poorly understood, and much could be learned from experimental observation. Much refinement of the sample design was done, but there was still no events observed by SFG that were clearly attributable to HMX initiation. No broadening or new peaks were observed at all, and no significant loss of SFG intensity occurred besides the expected loss from the destruction of the aluminum substrate. It is possible that a more uniform and better made sample, perhaps along with significantly more laser power, could successfully observe initiation. Flyer driven shocks and emission spectroscopy were used to determine the relative shock sensitivities of delta and beta HMX, as well as investigate the first nanoseconds after shock compression for HMX. While previous studies by the Dlott group have observed interesting phenomena in those first nanoseconds to microseconds after shock, those studies were done on beta HMX. Similar experiments were done on delta HMX, and it exhibits similar behavior initially with a very high temperature spike, though later behavior is not identical.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-02-28 without embargo terms","The student, Yuxiao Sun, accepted the attached license on 2016-09-02 at 21:19.","The student, Yuxiao Sun, submitted this Dissertation for approval on 2016-09-02 at 21:23.","This Dissertation was approved for publication on 2016-09-07 at 08:59.","DSpace SAF Submission Ingestion Package generated from Vireo submission #10143 on 2017-02-28 at 14:45:52","Made available in DSpace on 2017-03-01T15:46:01Z (GMT). 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