{"_buckets": {"deposit": "77943fbb-52bd-4603-a180-1b79cef69d9f"}, "_deposit": {"created_by": 1, "id": "251", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "251"}, "status": "published"}, "_oai": {"id": "oai:ir.soken.ac.jp:00000251", "sets": ["9"]}, "author_link": ["0", "0", "0"], "item_1_biblio_info_21": {"attribute_name": "書誌情報（ソート用）", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2008-03-19", "bibliographicIssueDateType": "Issued"}, "bibliographic_titles": [{}]}]}, "item_1_creator_2": {"attribute_name": "著者名", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "KAFLE, BHIM PRASAD"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_creator_3": {"attribute_name": "フリガナ", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "カフレ, ビヒム プラサッド"}], "nameIdentifiers": [{"nameIdentifier": "0", "nameIdentifierScheme": "WEKO"}]}]}, "item_1_date_granted_11": {"attribute_name": "学位授与年月日", "attribute_value_mlt": [{"subitem_dategranted": "2008-03-19"}]}, "item_1_degree_grantor_5": {"attribute_name": "学位授与機関", "attribute_value_mlt": [{"subitem_degreegrantor": [{"subitem_degreegrantor_name": "総合研究大学院大学"}]}]}, "item_1_degree_name_6": {"attribute_name": "学位名", "attribute_value_mlt": [{"subitem_degreename": "博士（理学）"}]}, "item_1_description_1": {"attribute_name": "ID", "attribute_value_mlt": [{"subitem_description": "2008009", "subitem_description_type": "Other"}]}, "item_1_description_12": {"attribute_name": "要旨", "attribute_value_mlt": [{"subitem_description": "In the doctoral thesis of Mr. Kafle, the results of the study on the absolute total photoionization cross section \u0026#963;\u003csmall\u003eabs,I\u003c/small\u003e of gaseous C\u003csub\u003e\u003csmall\u003e60\u003c/sub\u003e\u003c/small\u003e in the photon energy \u003ci\u003ehv\u003c/i\u003e range from 25 to 120 eV are presented. The measurements were carried out using photoionization mass spectrometry in combination with synchrotron radiation. Absolute partial cross sections \u0026#963;\u003csmall\u003eabs\u003c/small\u003e(z+) (z = 1-3) for the formation of the ions in a charge state z from C\u003csub\u003e\u003csmall\u003e60\u003c/sub\u003e\u003c/small\u003e were evaluated by considering the absolute detection efficiencies of photoions in different charge states. Then the absolute total photoionization cross section (\u0026#963;\u003csmall\u003eabs,I\u003c/small\u003e) was obtained by summing up all of the \u0026#963;\u003csmall\u003eabs\u003c/small\u003e(z+) and compared with available experimental data in the literature. For instance, the, \u0026#963;\u003csmall\u003eabs,I\u003c/small\u003e  obtained from his study takes the value of 401 Mb at \u003ci\u003ehν\u003c/i\u003e = 25.5 eV. This value is a little smaller than \u0026#963;\u003csmall\u003eabs,A\u003c/small\u003e determined by Jaensch and Kamke using the gas chamber technique [R. Jaensch and W. Kamke, Mol. Mater. 13 (2000) 143] (～450 ± 213 Mb at 25.5 eV). Moreover, the \u0026#963;\u003csmall\u003eabs,I\u003c/small\u003e curve obtained from his study was combined with the photoabsorption cross section curves of C\u003csub\u003e\u003csmall\u003e60\u003c/sub\u003e\u003c/small\u003e at \u003ci\u003ehv \u003c/i\u003e= 3.5 - 26 eV in the literature (specifically, the data of Jaensch and Kamke at \u003ci\u003ehv\u003c/i\u003e = 11.4 - 25 eV, and of Yasumatsu \u003ci\u003eet al. \u003c/i\u003e at \u003ci\u003ehv\u003c/i\u003e = 3.5 - 11.4 eV [J. Chem. Phys. 104 (1996) 899] were used), after appropriate alterations of the vapor pressure are taken into account. The oscillator strengths are computed from the composite curve to be 178.5 and 230.5 for the \u003ci\u003ehv\u003c/i\u003e ranges from 3.5 to 40.8 eV and from 3.5 to 119 eV, respectively. These oscillator strengths agree well with those expected from the Thomas-Kuhn- Reiche sum rule and 60 times the photoabsorption cross section of a carbon atom. Moreover, the \u0026#963;\u003csmall\u003eabs,I\u003c/small\u003e curve obtained from his study behaves similarly to the relative photoionization cross section curve reported by Reink\u0026ouml;ster \u003ci\u003eet al.\u003c/i\u003e [J. Phys. B, 37(2004) 2135].\u003cbr /\u003e　　When a fullerene, in particular C\u003csub\u003e\u003csmall\u003e60\u003c/sub\u003e\u003c/small\u003e molecule, absorbs a photon of energy ～ 41 eV or above, a highly excited ion of C\u003csub\u003e\u003csmall\u003e60\u003c/sub\u003e\u003c/small\u003e is produced and then dissociates into smaller ionic and neutral fragments.  In his doctoral thesis, description is also made on a design of a new version of photofragment imaging spectrometer, which will be applied to observe the momentum distributions of ionic fragments from large molecules, clusters, and fullerenes. The apparatus consists of several components: circular electrodes, a time-of-flight drift tube, a potential-switcheable \u003ci\u003emass gate, ion reflector,\u003c/i\u003e and a position sensitive detector (PSD). The velocity focusing lens system of Eppink- Parker type [Eppink and Parker, Rev. Sci. Instrum. 68, 3477 (1997)] realizes high resolution of the photofragment images. Moreover, the mass \u003ci\u003egate\u003c/i\u003e is incorporated inside the tube in order to separate fragment ions with a particular cluster size (e.g.C\u003csub\u003e\u003csmall\u003e58\u003c/sub\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003e) from those with other sizes (e.g. C\u003csmall\u003e\u003csub\u003e60\u003c/small\u003e\u003c/sub\u003e\u003csup\u003e+\u003c/sup\u003e, and C\u003csmall\u003e\u003csub\u003e56\u003c/small\u003e\u003c/sub\u003e\u003csup\u003e+\u003c/sup\u003e).\u003cbr /\u003e　　The optimum arrangement and dimensions of the components are determined from the results of ion trajectories of C\u003csub\u003e\u003csmall\u003e56\u003c/sub\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003e,C\u003csub\u003e\u003csmall\u003e58\u003c/sub\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003e and C\u003csub\u003e\u003csmall\u003e60\u003c/sub\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003e simulated by using the SIMION software. The calculated images of C\u003csub\u003e\u003csmall\u003e58\u003c/sub\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003e ions show that kinetic-energy resolution of 10 meV is achievable. Moreover, a linear dependence between (quasi-linear relation) the y-component of the momentum (Py) and that of the displacement on PSD (Δy) is obtained. This observation allows one to transform the displacement of ionic fragment on PSD to obtain velocity and spatial distribution of a desired fragment.\u003cbr /\u003e　　The present momentum imaging spectrometer has been constructed and installed in the end station of beam line 2B in the UVSOR facility. The preliminary experimental results on Kr sample at room temperature (Kr\u003csup\u003e+\u003c/sup\u003eand Kr\u003csup\u003e\u003csmall\u003e2\u003c/sup\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003ewere focused on to the PSD) obtained using this spectrometer show that ions produced in the ionization region can be focused at the center of the  PSD (within 2mm), if image defocusing due to thermal energy of the molecule is omitted. These experimentally observed results guides us that one of the objectives of the present design is fulfilled. Thus, present momentum imaging spectrometer can be utilized to obtain reliable velocity distributions of the fullerene fragments. From the close analysis of photofragment images, one will be able to decide on which mechanism dominates the fragmentation of fullerene ions between sequential loss of C\u003csub\u003e\u003csmall\u003e2\u003c/sub\u003e\u003c/small\u003e unit (C\u003csub\u003e\u003csmall\u003e60-2n+2\u003c/sub\u003e\u003csup\u003ez+\u003c/sup\u003e\u003c/small\u003e → C\u003csub\u003e\u003csmall\u003e60-2n\u003c/sub\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003e + C\u003csub\u003e\u003csmall\u003e2\u003c/sub\u003e\u003c/small\u003e) and single-step two-fragment fission (C\u003csub\u003e\u003csmall\u003e60\u003c/sub\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003e → C\u003csub\u003e\u003csmall\u003e60-2n\u003c/sub\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003e+C\u003csub\u003e\u003csmall\u003e2n\u003c/sub\u003e\u003c/small\u003e)of the parent C\u003csub\u003e\u003csmall\u003e60\u003c/sub\u003e\u003c/small\u003e\u003csup\u003e+\u003c/sup\u003eions. Because three- dimensional velocity distributions are expected to considerably differ for different mechanisms. 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