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dc.contributor.author廖雪兒en_US
dc.contributor.authorLiu, Suet-Yien_US
dc.contributor.author李遠鵬en_US
dc.contributor.author鈴木俊法en_US
dc.contributor.authorLee, Yuan-Pernen_US
dc.contributor.authorSuzuki, Toshinorien_US
dc.date.accessioned2014-12-12T01:25:28Z-
dc.date.available2014-12-12T01:25:28Z-
dc.date.issued2010en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#GT079525807en_US
dc.identifier.urihttp://hdl.handle.net/11536/41242-
dc.description.abstractI have constructed a He(I) ultraviolet photoelectron spectrometer using a supersonic molecular beam and a two-dimensional position-sensitive detector of photoelectrons. The photoelectron imaging (PEI) spectrometer enabled measurements of photoelectron spectra and photoelectron angular distributions with an efficiency considerably higher than a conventional spectrometer using a hemispherical energy analyzer. The most crucial factor for this achievement was to overcome high susceptibility of PEI to background electrons generated by scattered He(I) radiation. I examined various designs of electrodes experimentally and computationally and identified the main source of the background photoemission as the repeller plate used for acceleration of electrons. I designed a new electrostatic lens that intercepts background photoelectrons from the repeller plate traveling toward the imaging detector. High energy resolution (□E/E) of 0.735 % was achieved at E = 5.461 eV with He(I) radiation that has rather poor beam characteristics. The photoelectron angular anisotropies as a function of photoelectron kinetic energies are presented for jet-cooled benzene and pyridine. The PEI spectrometer was also employed in photoionization experiments using a vacuum ultraviolet free electron laser (VUV-FEL) at SPring-8 in Japan as a light source. A time-resolved photoelectron imaging using a femtosecond ultraviolet (UV) laser as a pump pulse and the VUV-FEL as a probe pulse is presented. Ultrafast internal conversion and intersystem crossing in pyrazine in a supersonic molecular beam were clearly observed. The VUV radiation allowed us to observe the entire Franck-Condon envelope in photoionization from a transient electronic state, which was not possible in UV-DUV experiment in the laboratory.zh_TW
dc.description.abstractI have constructed a He(I) ultraviolet photoelectron spectrometer using a supersonic molecular beam and a two-dimensional position-sensitive detector of photoelectrons. The photoelectron imaging (PEI) spectrometer enabled measurements of photoelectron spectra and photoelectron angular distributions with an efficiency considerably higher than a conventional spectrometer using a hemispherical energy analyzer. The most crucial factor for this achievement was to overcome high susceptibility of PEI to background electrons generated by scattered He(I) radiation. I examined various designs of electrodes experimentally and computationally and identified the main source of the background photoemission as the repeller plate used for acceleration of electrons. I designed a new electrostatic lens that intercepts background photoelectrons from the repeller plate traveling toward the imaging detector. High energy resolution (□E/E) of 0.735 % was achieved at E = 5.461 eV with He(I) radiation that has rather poor beam characteristics. The photoelectron angular anisotropies as a function of photoelectron kinetic energies are presented for jet-cooled benzene and pyridine. The PEI spectrometer was also employed in photoionization experiments using a vacuum ultraviolet free electron laser (VUV-FEL) at SPring-8 in Japan as a light source. A time-resolved photoelectron imaging using a femtosecond ultraviolet (UV) laser as a pump pulse and the VUV-FEL as a probe pulse is presented. Ultrafast internal conversion and intersystem crossing in pyrazine in a supersonic molecular beam were clearly observed. The VUV radiation allowed us to observe the entire Franck-Condon envelope in photoionization from a transient electronic state, which was not possible in UV-DUV experiment in the laboratory.en_US
dc.language.isoen_USen_US
dc.subject電子影像zh_TW
dc.subjectHe(I)en_US
dc.subjectphotoelectron imagingen_US
dc.title分子束多原子分子之紫外光光電子影像zh_TW
dc.titleVacuum ultraviolet photoelectron imaging of polyatomic molecules in supersonic molecular beamsen_US
dc.typeThesisen_US
dc.contributor.department應用化學系碩博士班zh_TW
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