摘要
本論文主要分成兩部分，第一部份係以共振腔振盪衰減法，研究在0.96 □m附近CO分子的第四泛頻 (v″=0→v′=5) 之振轉動吸收光譜和在1.2 □m 光區附近CH3OO和CD3OO 躍遷之吸收光譜。吾人觀測到CO的第四泛頻吸收光譜，其P分支的譜帶強度要較R分支的譜帶強度為強，此情形與CO其他的較低泛頻之振轉動吸收光譜之PR分支的譜帶強度的分佈情形相反。吾人估計在293 K其譜帶強度為(5.1□1.3) □ 10–29 m，純振動矩陣元素 = (3.6□0.3) □10–36 C m，Herman-Wallis因子為 。
而對於CH3OO和CD3OO 躍遷之吸收光譜，吾人觀測到CH3OO之 和 之電振吸收譜帶，以及CD3OO之 、 、 、 、 和 之電振吸收譜帶。吾人並得到CH3OO在 之振動頻率，□'7 = 886.8 cm–1，□'12 = 241.9 cm–1，以及CD3OO在 之振動頻率，□′5 = 970.9 cm–1，□′6 = 954.4 cm–1，□′7 = 823.7 cm–1。而造成在1.2 □m附近CH3OO與CD3OO之吸收光譜之差異，可用多維Franck-Condon因子來解釋之。
本論文的第二部份係利用同步輻射光源來量測H2O、HOD和D2O在112 – 125 nm之絕對吸收截面積。其中HOD在此光區之吸收光譜是首次被量測到。因HOD與H2O和D2O的對稱性不同，在HOD的吸收光譜中，吾人首次觀測到原本在H2O和D2O無法觀測到的□3振動吸收譜帶。

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