在本光譜學研究中，我們利用兩台脈衝式染料雷射進行雙光子共振螢光衰減光譜技術（Optical-Optical Double Resonance Fluorescence Depletion Spectroscopy）來偵測氣態氫化鈉分子高能位的D1＋電子態，我們採用疊加式雙光子激發（Stepwise OODR Excitation）的方式進行實驗，並藉由檢測A1＋  X1＋的螢光衰減訊號來找尋D1＋電子態的振轉能級。

　　我們觀測的能量範圍分別位於43215 ~ 44795 cm-1、41736 ~ 42095 cm-1總共得到v*+18 ~ v*＋37、v*+2 ~ v*-2共24個振動量子數。觀測的轉動量子數分佈於J＝1 ~ 11中，共計有156個振轉能階被觀測到。其振動能階能量差ΔGv＋1/2分佈於171 ~ 62 cm-1中，轉動常數Bv則分佈於0.594 ~ 0.451 cm-1中。

　　未來期望能再加入更詳盡的實驗數據，且進一步確認絕對振動量子數v值並推得分子常數，使氫化鈉分子D1＋電子態的位能曲線更臻完整。

　In this study, nineteen vibrational levels of the NaH D1＋ electronic state have been observed by the Optical-Optical Double Resonance Fluorescence Depletion Spectroscopy (OODR-FDS) technique. We applied the stepwise OODR excitation in our experiments. The OODR spectra of the NaH D1＋ electronic state have been taken by monitoring the fluorescence depletion of the A1＋ state to the X1＋ state.

　We have observed 156 rovibrational levels (including 24 vibrational levels) of the D1＋ electronic state；they are in the range of 43215 ~ 44795 cm-1.、41736 ~ 42095 cm-1 The observed vibrational level spacings of ΔGv＋1/2 are in the range 171 ~ 62 cm-1and derived rotational constants Bv are 0.594 ~ 0.451 cm-1.

　However, we have to confirm the absolute vibrational quantum number by a further study and the Dunham coefficients can be derived to construct the complete potential energy curve of the NaH D1＋ electronic state.

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