以共振二光子游離與質量解析臨界游離光譜術研究2-氟化萘分子之特性
碩士 === 國立臺灣師範大學 === 化學系 === 98 === The two-color resonant two-photon ionization and mass analyzed threshold ionization spectroscopic techniques have been used to probe the molecular properties of 2-fluoronaphthalene (2FN). The obtained experimental data include the precise transition energy from the...
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| Format: | Others |
| Language: | zh-TW |
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2010
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| Online Access: | http://ndltd.ncl.edu.tw/handle/80731587811608526740 |
| Summary: | 碩士 === 國立臺灣師範大學 === 化學系 === 98 === The two-color resonant two-photon ionization and mass analyzed threshold ionization spectroscopic techniques have been used to probe the molecular properties of 2-fluoronaphthalene (2FN). The obtained experimental data include the precise transition energy from the ground state to the first electronically excited state and the adiabatic ionization energy (IE) as well as the active vibrational spectra in the first electronically excited S1 and cationic ground D0 states. These new vibrationally resolved spectra can be used as fingerprints for molecular identification. Analysis of the obtained vibronic and cation spectra reveals that the origin of the electronic transition (E1) and the adiabatic IE of 2FN are 31803 ± 2 cm-1 and 66771 ± 5 cm-1, respectively. Most of the active vibrations of 2-fluoronaphthalene in the S1 and D0 states are related to in-plane vibrations of the aromatic ring. Comparing the experimental data of 2FN with those of naphthalene helps us learn the fluorine substitution affects on the electronic excitation and ionization processes as well as molecular vibration. We have also performed the ab initio and density functional calculations which help us in spectral assignment and support our experimental findings.
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