Abstract We report the resonance enhanced two-photon ionization (REMPI) and mass analyzed threshold ionization (MATI) spectra of 4-ethylanisole. The band origin of S1 ← S0 transition and accurate adiabatic ionization energy of 4-ethylanisole are determined to be 35575 ± 2 cm−1 and 63718 ± 5 cm−1, respectively. The Franck-Condon simulation of the vibrationally resolved electronic spectrum for D0 ← S1 transition is calculated and employed to assist us in assigning the observed vibronic bands in MATI experiment. Many vibrations in the S1 and D0 states, not only the aromatic ring bending, OCH3 and ethyl group bending but also their combination, are observed. The substitution effects of ethyl on transition energy and ionization energy are discussed.

中文翻译：

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4-乙基苯甲醚的共振增强双光子电离和质量分析阈值电离光谱

摘要 我们报告了 4-乙基苯甲醚的共振增强双光子电离 (REMPI) 和质量分析阈值电离 (MATI) 光谱。4-乙基苯甲醚的 S1 ← S0 跃迁带原点和精确的绝热电离能分别确定为 35575 ± 2 cm-1 和 63718 ± 5 cm-1。计算 D0 ← S1 跃迁的振动分辨电子谱的 Franck-Condon 模拟并用于帮助我们分配 MATI 实验中观察到的振动带。观察到 S1 和 D0 状态的许多振动，不仅是芳环弯曲、OCH3 和乙基弯曲，而且还观察到它们的组合。讨论了乙基对过渡能和电离能的取代作用。