量測並模擬一系列電荷轉移（charge-transfer ）分子在溶液中的線性吸
收譜與共振拉曼譜（Resonance Raman spectrum ），將模擬得到的參數代入
Wang 對雙能態模型（two level model ）的修正公式，可以得到這些分子第
一超極化率（first hyperpolarizability ）β的色散（dispersion ）關係。由共振
拉曼譜與拉曼激發圖（Raman profile ）可證實本實驗的其中兩個電荷轉移分
子僅有一個激發態，但另外三個分子卻具有兩個激發態。由於雙能態模型
只考慮一個激發態，因此Wang 對雙能態模型的修正公式僅能解釋一部分分
子第一超極化率的色散行為。

The linear absorption spectrum and resonance Raman spectrum of a
series of charge-transfer molecules in solution are measured. The results
are fitted to theoretical expressions. The dispersion of the first hyper-polarizability
is investigated by substituting the parameters, which are obtained from
the fit. The results are compared with Wang's formula
modified from the simple Oudar and Chemla two-level model. The
resonance Raman spectra and Raman profiles show that only one excited
state exists in two of the charge-transfer molecules and two excited states
are present in three other molecules investigated in this expeariment. It is
concluded that Wang's modified formula is only valid to account for the
dispersion of the first hyperpolarizability when there is only one excited
vibronic state.

目錄
第一章 簡介 1
第二章 原理
Ⅰ.共振拉曼散射與電荷轉移吸收 3
Ⅱ.第一超極化率 7
第三章 實驗
Ⅰ.樣品配製 10
Ⅱ.共振拉曼譜量測 10
Ⅲ.微分截面計算 14
第四章 結果與討論
Ⅰ.吸收譜、共振拉曼譜與拉曼激發圖 15
Ⅱ.Wu 分子的第一超極化率 25
結論 29
參考資料 30

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