{"id":{"repo_id":"heid-diss","oai_identifier":"oai:archiv.ub.uni-heidelberg.de:5230"},"canonical_url":"https://search.dev.ndltd.org/etd/heid-diss/oai:archiv.ub.uni-heidelberg.de:5230","repository":{"repo_id":"heid-diss","name":"Universität Heidelberg","base_url":"http://archiv.ub.uni-heidelberg.de/volltextserver/cgi/oai2"},"display":{"title":"Selective Laser-Induced Oxidation of Carbon Chain Molecules in Cryogenic Matrices","abstract":"We have tested and applied a laser-induced oxidation method for identifying IR-absorptions of those carbon molecules which have known UV/VIS absorptions. For this purpose we trapped the molecules of carbon vapor in non-inert matrices(O2, Ar-O2). Upon matrix annealing, molecular growth took place leading to a mixture of linear carbon species up to C17. The output of an excimer-dye laser was employed to photo-bleach selectively the strong UV/VIS absorptions of these trapped carbon molecules. Correlations of the changes in IR and UV/VIS spectra were observed. After successful tests performed on C9, C11, C13 for which the UV/VIS as well as the IR absorptions are known we applied the method to the C15 molecule for which the UV/VIS absorption is at around 450 nm but the IR absorptions are unknown. In the course of this research we found that the 1819, 1816 cm^-1 pattern of absorptions in an O2-matrix (1818 cm^-1 in an Ar-matrix) can be assigned to the most intense IR-active C13 stretching mode. The pattern of absorption lines at 1721, 1714, 1707 cm^-1 and 1695 cm^-1 can be assigned as site peaks of C15 in an O2-matrix (1713, 1700, 1695 cm^-1 in an Ar-O2-matrix). To obtain information about infrared absorptions of carbon chain oxides of the type CnO and OCnO, oxygen matrices with replaced ^16O -> ^18O isotopes were applied. There we found that two absorptions at 1803 and 1844 cm^-1 in an Ar-matrix (1800 and 1840 cm^-1 in O2) belong to oxides of a carbon chain rather than to a pure carbon species. The absorption at 2180 cm^-1 in an O2-matrix was assigned to the C6O2 molecule. Our data revise some of the assignments existing in the literature.","abstract_html":"We have tested and applied a laser-induced oxidation method for identifying IR-absorptions of those carbon molecules which have known UV/VIS absorptions. For this purpose we trapped the molecules of carbon vapor in non-inert matrices(O2, Ar-O2). Upon matrix annealing, molecular growth took place leading to a mixture of linear carbon species up to C17. The output of an excimer-dye laser was employed to photo-bleach selectively the strong UV/VIS absorptions of these trapped carbon molecules. Correlations of the changes in IR and UV/VIS spectra were observed. After successful tests performed on C9, C11, C13 for which the UV/VIS as well as the IR absorptions are known we applied the method to the C15 molecule for which the UV/VIS absorption is at around 450 nm but the IR absorptions are unknown. In the course of this research we found that the 1819, 1816 cm^-1 pattern of absorptions in an O2-matrix (1818 cm^-1 in an Ar-matrix) can be assigned to the most intense IR-active C13 stretching mode. The pattern of absorption lines at 1721, 1714, 1707 cm^-1 and 1695 cm^-1 can be assigned as site peaks of C15 in an O2-matrix (1713, 1700, 1695 cm^-1 in an Ar-O2-matrix). To obtain information about infrared absorptions of carbon chain oxides of the type CnO and OCnO, oxygen matrices with replaced ^16O -> ^18O isotopes were applied. There we found that two absorptions at 1803 and 1844 cm^-1 in an Ar-matrix (1800 and 1840 cm^-1 in O2) belong to oxides of a carbon chain rather than to a pure carbon species. The absorption at 2180 cm^-1 in an O2-matrix was assigned to the C6O2 molecule. Our data revise some of the assignments existing in the literature.","abstract_has_math":false,"creators":["Strelnikov, Dmitry"],"institution":"Universität Heidelberg","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Wolfgang (Prof. Dr.), Krätschmer"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2004,"date_issued":"2004-12-22","date_published":"2004-12-22","updated_at":"2026-07-24T02:30:04Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://www.ub.uni-heidelberg.de/archiv/5230","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Wolfgang (Prof. Dr.), Krätschmer"]},{"key":"dc:creator","label":"Author","values":["Strelnikov, Dmitry"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Universitätsbibliothek Heidelberg"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Universität Heidelberg"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["We have tested and applied a laser-induced oxidation method for identifying IR-absorptions of those carbon molecules which have known UV/VIS absorptions. For this purpose we trapped the molecules of carbon vapor in non-inert matrices(O2, Ar-O2). Upon matrix annealing, molecular growth took place leading to a mixture of linear carbon species up to C17. The output of an excimer-dye laser was employed to photo-bleach selectively the strong UV/VIS absorptions of these trapped carbon molecules. Correlations of the changes in IR and UV/VIS spectra were observed. After successful tests performed on C9, C11, C13 for which the UV/VIS as well as the IR absorptions are known we applied the method to the C15 molecule for which the UV/VIS absorption is at around 450 nm but the IR absorptions are unknown. In the course of this research we found that the 1819, 1816 cm^-1 pattern of absorptions in an O2-matrix (1818 cm^-1 in an Ar-matrix) can be assigned to the most intense IR-active C13 stretching mode. The pattern of absorption lines at 1721, 1714, 1707 cm^-1 and 1695 cm^-1 can be assigned as site peaks of C15 in an O2-matrix (1713, 1700, 1695 cm^-1 in an Ar-O2-matrix). To obtain information about infrared absorptions of carbon chain oxides of the type CnO and OCnO, oxygen matrices with replaced ^16O -> ^18O isotopes were applied. There we found that two absorptions at 1803 and 1844 cm^-1 in an Ar-matrix (1800 and 1840 cm^-1 in O2) belong to oxides of a carbon chain rather than to a pure carbon species. The absorption at 2180 cm^-1 in an O2-matrix was assigned to the C6O2 molecule. Our data revise some of the assignments existing in the literature.","Eine neue Methode der Laser-induzierten Oxydation wurde entwickelt, die es erlaubt, die IR Absorptionen von solchen Kohlenstoffmolekülen zu ermitteln, von deren man nur die UV/VIS Absorptionen kennt. Dazu haben wir die Moleküle von Kohlenstoff-Dampf in reaktiven Matrizen (O2, Ar-O2) isoliert und durch Erwärmen der Matrix ein Gemisch linearer Spezies bis hinauf zu C17 erzeugt. Mit dem Licht eines auf die UV/VIS Absorptions-Wellenlänge der Kohlenstoffketten abgestimmten Excimer-Farbstoff-Laser konnten wir die Kohlenstoffmoleküle gezielt oxidieren, und korrelierte Änderungen in den UV/VIS und IR Spektren beobachten. Nach erfolgreichen methodischen Tests an den Kohlenstoff-Ketten C9, C11 und C13, bei denen sowohl die UV/VIS als auch die IR Absorptionen bekannt sind, wagten wir uns an das Molekül C15, von dem man nur die UV/VIS Absorption bei 450 nm kennt. Im Verlauf dieser Experimente bemerkten wir, dass ein Absorptionslinienpaar bei 1819 und 1816 cm^-1 in der Sauerstoffmatrix (1818 cm^-1 in Argon) der intensivsten IR aktiven Streckschwingung von C13 entspricht. Eine Gruppe von Linien bei 1721, 1714, 1707 und 1695 cm^-1 können \"Site-Peak\" Absorptionen von C15 in einer Matrix aus Sauerstoff (1713, 1700, und 1695 cm^-1 in einer Ar-O2 Matrix) zugeordnet werden. Um Daten über die Absorptionen von Oxyden der Kohlenstoff-Ketten vom Typ CnO oder OCnO zu gewinnen, haben wir ^16O -> ^18O isotopisch substituierte Matrizen verwendet. Dabei haben wir entdeckt, dass die zwei Absorptionen bei 1803 und 1844 cm^-1 in Argon (1800 und 1840 cm^-1 in Sauerstoff) zu Oxyden und nicht zu reinen Kohlenstoffketten gehören. Weiterhin ist die Absorption bei 2180 cm^-1 (in einer Sauerstoff Matrix) dem C6O2 Molekül zuzuschreiben. Unsere Ergebnisse zeigen, dass in der Literatur einige IR Absorptionen falsch zugeordnet worden sind."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Selective Laser-Induced Oxidation of Carbon Chain Molecules in Cryogenic Matrices","Gezielte laserinduzierte Oxydation von Kohlenstoffmolekülen in kryogenen Matrizen"]}]}],"canonical_facts":{"dc:contributor":["Wolfgang (Prof. Dr.), Krätschmer"],"dc:creator":["Strelnikov, Dmitry"],"dc:description.abstract":["We have tested and applied a laser-induced oxidation method for identifying IR-absorptions of those carbon molecules which have known UV/VIS absorptions. For this purpose we trapped the molecules of carbon vapor in non-inert matrices(O2, Ar-O2). Upon matrix annealing, molecular growth took place leading to a mixture of linear carbon species up to C17. The output of an excimer-dye laser was employed to photo-bleach selectively the strong UV/VIS absorptions of these trapped carbon molecules. Correlations of the changes in IR and UV/VIS spectra were observed. After successful tests performed on C9, C11, C13 for which the UV/VIS as well as the IR absorptions are known we applied the method to the C15 molecule for which the UV/VIS absorption is at around 450 nm but the IR absorptions are unknown. In the course of this research we found that the 1819, 1816 cm^-1 pattern of absorptions in an O2-matrix (1818 cm^-1 in an Ar-matrix) can be assigned to the most intense IR-active C13 stretching mode. The pattern of absorption lines at 1721, 1714, 1707 cm^-1 and 1695 cm^-1 can be assigned as site peaks of C15 in an O2-matrix (1713, 1700, 1695 cm^-1 in an Ar-O2-matrix). To obtain information about infrared absorptions of carbon chain oxides of the type CnO and OCnO, oxygen matrices with replaced ^16O -> ^18O isotopes were applied. There we found that two absorptions at 1803 and 1844 cm^-1 in an Ar-matrix (1800 and 1840 cm^-1 in O2) belong to oxides of a carbon chain rather than to a pure carbon species. The absorption at 2180 cm^-1 in an O2-matrix was assigned to the C6O2 molecule. Our data revise some of the assignments existing in the literature.","Eine neue Methode der Laser-induzierten Oxydation wurde entwickelt, die es erlaubt, die IR Absorptionen von solchen Kohlenstoffmolekülen zu ermitteln, von deren man nur die UV/VIS Absorptionen kennt. Dazu haben wir die Moleküle von Kohlenstoff-Dampf in reaktiven Matrizen (O2, Ar-O2) isoliert und durch Erwärmen der Matrix ein Gemisch linearer Spezies bis hinauf zu C17 erzeugt. Mit dem Licht eines auf die UV/VIS Absorptions-Wellenlänge der Kohlenstoffketten abgestimmten Excimer-Farbstoff-Laser konnten wir die Kohlenstoffmoleküle gezielt oxidieren, und korrelierte Änderungen in den UV/VIS und IR Spektren beobachten. Nach erfolgreichen methodischen Tests an den Kohlenstoff-Ketten C9, C11 und C13, bei denen sowohl die UV/VIS als auch die IR Absorptionen bekannt sind, wagten wir uns an das Molekül C15, von dem man nur die UV/VIS Absorption bei 450 nm kennt. Im Verlauf dieser Experimente bemerkten wir, dass ein Absorptionslinienpaar bei 1819 und 1816 cm^-1 in der Sauerstoffmatrix (1818 cm^-1 in Argon) der intensivsten IR aktiven Streckschwingung von C13 entspricht. Eine Gruppe von Linien bei 1721, 1714, 1707 und 1695 cm^-1 können \"Site-Peak\" Absorptionen von C15 in einer Matrix aus Sauerstoff (1713, 1700, und 1695 cm^-1 in einer Ar-O2 Matrix) zugeordnet werden. Um Daten über die Absorptionen von Oxyden der Kohlenstoff-Ketten vom Typ CnO oder OCnO zu gewinnen, haben wir ^16O -> ^18O isotopisch substituierte Matrizen verwendet. Dabei haben wir entdeckt, dass die zwei Absorptionen bei 1803 und 1844 cm^-1 in Argon (1800 und 1840 cm^-1 in Sauerstoff) zu Oxyden und nicht zu reinen Kohlenstoffketten gehören. Weiterhin ist die Absorption bei 2180 cm^-1 (in einer Sauerstoff Matrix) dem C6O2 Molekül zuzuschreiben. Unsere Ergebnisse zeigen, dass in der Literatur einige IR Absorptionen falsch zugeordnet worden sind."],"dc:format.medium":["application/pdf"],"dc:publisher":["Universitätsbibliothek Heidelberg"],"dc:title":["Selective Laser-Induced Oxidation of Carbon Chain Molecules in Cryogenic Matrices","Gezielte laserinduzierte Oxydation von Kohlenstoffmolekülen in kryogenen Matrizen"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Universität Heidelberg"]},"updated_at":"2026-07-24T02:30:04Z"}