本實驗利用兩台脈衝式染料雷射，以V-躍遷形式雙光子共振螢光衰減光譜技術經由B1Pu 中間態，研究41Su+ 及附近電子態，其躍遷方程式可表示如下：
B1Pu (v’, J’) ← X1S g + (v”, J”) + hυ1
41Su+ or nearby states ← X1S g + (v”, J”) + hυ2

在能量31600~36500 cm-1之間，我們發現6個不同系列的訊號。經由分析，包含21Pu 電子態164個振轉能級，41Pu 電子態268個振轉能級，可能的41Su+ 電子態159個振轉能級，51Pu 電子態234個振轉能級，61Pu電子態65個振轉能級。其中在能量31800~32500 cm-1 附近所發現的訊號尚無法明確的定義，而依據理論計算所得到的能量值，我們初步將其認為是31Pu 電子態，只是需更多的實驗來加以佐證，而此能態共獲得46個振轉能級。我們最後利用非線性擬合程式計算這些能態的分子常數，並建立位能曲線。

In this study, two tunable pulse dye lasers have been used to probe the rovibrational levels of the 41Su+ and the nearby states by V-type optical-optical double resonance fluorescence depletion method through the intermediate B1Pu state levels. The processes are described as follows：
B1Pu (v’, J’) ← X1S g + (v”, J”) + hυ1
41Su+ or nearby states ← X1S g + (v”, J”) + hυ2

In the energy region of 31600~36500 cm-1, we have observed some signals divided into six groups. To our analysis, the signals contain 164 rovibrational levels of 21Pu state , 268 rovibrational levels of 41Pu state, 159 rovibrational levels of 41Su+ state, 234 rovibrational levels of 51Pu state, and 65 rovibrational levels of 61Pu state. However the signals between 31800~32500 cm-1 can’t be determined evidently. According to the energy comparison of our results and some theoretical calculations, we still assign them to be 31Pu state preliminary. We oberved 46 rovibrational levels of the state. The Dunham coefficients and Rydberg- Klein-Rees (RKR) potential energy curves of the six states are determined by our temporarily vibrational numbering assignments.

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