| 研究生: |
林明弘 Lin, Ming-Hong |
|---|---|
| 論文名稱: |
氣態氘化鈉C1Σ+電子能態雙光子共振螢光減量光譜 Study of the gas phase NaD C1Σ+state by OODR depletion spectroscopy |
| 指導教授: |
黃守仁
Whang, Thou-Jen |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2013 |
| 畢業學年度: | 101 |
| 語文別: | 中文 |
| 論文頁數: | 101 |
| 中文關鍵詞: | 雙光子共振 、螢光減量 、氘化鈉 、雷射誘導螢光光譜法 、同位素位移 、C電子能態 |
| 外文關鍵詞: | Optical-optical double resonance, Fluorescence depletion, NaD, Laser-induced fluorescence, Isotope shift, C1Σ+state |
| 相關次數: | 點閱:215 下載:3 |
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在本實驗中,我們利用Nd:YAG 雷射激發兩台可調變波長的染料雷射進行雙光子共振螢光減弱光譜實驗來探討氘化鈉分子C1Σ+能態,固定第一道雷射使其產生A1Σ+ -> X1Σ+的放射螢光,之後藉由第二道雷射產生螢光減弱訊號來偵測氘化鈉分子C1Σ+能態的振轉能級。
利用比較實驗值和同位素位移預測的振動能階差ΔGv+1/2得到本實驗所觀測到的最低振動量子數為v=16,之後也利用了定義不同第一個觀測到的振動能級v*去計算得到的FCF 值和氘化鈉C1Σ+能態螢光減弱訊號的強度進行比對的方法來確定絕對振動量子數的確定。
總共偵測到271個氘化鈉分子C1Σ+能態的振轉能級,其中33個振動能級(v=16~49)及8個轉動能級(J=10~3),偵測能量範圍位在37330~40911 cm-1。根據實驗觀測到的訊號,經由擬合得到氘化鈉分子C1Σ+能態每一個振動態的振動能量Gv、轉動能量Bv 等分子常數。此外由實驗結果經過Dunhum程式擬合之後可以推得一組登亥姆(Dunhum)分子常數以及RKR位能曲線。
In this experiment, the NaD C1Σ+ electronic state was investigated by optical-optical double resonance fluorescence depletion spectroscopy (OODRDS). The depletion spectra of NaD C1Σ+ state were observed by monitoring the fluorescence depletion from the transitions of A1Σ+ to X1Σ+ states.
Comparing the vibrational energy level difference ΔGv+1/2 between the predictions from the isotope shift and the experimental observations, the absolute vibrational quantum number can be determined. This result was confirmed by comparing the FCF values calculated from several vibrational quantum number assignments to the fluorescence depletion signals of NaD C1Σ+ state obtained experimentally.
A total of 271 rovibrational (v=16~49, J=3~10) levels of NaD C1Σ+ state in the energy range of 37330~40911 cm-1 was observed. The molecular constants vibrational (Gv) the rotational constant (Bv) for each rovibrational level were fitted individually. A global least square fitting was used to obtain a set of Dunham coefficients, and the RKR potential curve was constructed for the NaD C1Σ+ state.
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