アニリンのS₁電子状態の赤外分光を行った。方法は、まずジェット中のアニリンを紫外光でS₁状態に励起し、次に赤外光を入射した。赤外遷移した準位は振動緩和を起こすので、その緩和蛍光のみを選択しモニターしながら赤外波長を掃引して赤外遷移を観測した。その結果、S₁状態におけるC-H、N-H伸縮振動準位を観測した。さらに、S₁状態から3300~3800cm^-1高エネルギー側に新しい電子励起状態を観測した。

IR spectroscopy of aniline in S₁ was carried out. First, A UV laser light was introduced to excite aniline molecules in a jet to S₁. Then an IR laser light was introduced. When the IR laser is resonant with vibrational transitions of S₁, IRtransitions occur. and the vibrationally excited levels undergo the IVR process. As monitoring only the fluorescence from the bath modes, the IR laser light was scanned to observe IR transitions. As a result, C-H and N-H stretching vibrations in S₁ were observed. And furthermore, a new electronic state was observed above the S₁ origin by 3300-3800cm^-1.