Scholarlink

<p>Conjugated <i>π</i>-systems, often composed of carbon-carbon double bonds as key structural units, are among the most important organic chromophores and serve as prototypical systems for studying <i>π</i><i>π</i><sup>*</sup> excitation. Their ultrafast excited-state dynamics govern the outcomes of fundamental photochemical processes, including vision, photoisomerization, photosynthesis, and solar energy conversion. Here, we investigate the ultrafast dynamics of the simplest isolated C=C chromophore, ethylene, and its per-deuterated isotopologue using broadly tunable sub-4 femtosecond pulses in the 150-200 nm range combined with time-resolved photoelectron spectroscopy. Supported by advanced quantum dynamics calculations, our results reveal the important role of the <sup>1</sup><i>B</i><sub>3<i>g</i></sub>(<i>σ</i><i>π</i><sup>*</sup>) state, which is strongly coupled through torsional motion to the optically populated <sup>1</sup><i>B</i><sub>1<i>u</i></sub>(<i>π</i><i>π</i><sup>*</sup>) state. These findings establish a revised framework for understanding and controlling photochemical reaction in conjugated molecular systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Few-femtosecond photoelectron spectroscopy reveals fundamental photodynamics of the carbon-carbon double bond in ethylene

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月23日

查看全文
  • Arnab Sen,
  • Simon P. Neville,
  • Martin Kretschmar,
  • Martha Yaghoubi Jouybari,
  • Rostyslav Danylo,
  • José R. C. Andrade,
  • Marc J. J. Vrakking,
  • Albert Stolow,
  • Tamas Nagy,
  • Michael S. Schuurman,
  • Arnaud Rouzée

摘要

Conjugated π-systems, often composed of carbon-carbon double bonds as key structural units, are among the most important organic chromophores and serve as prototypical systems for studying ππ* excitation. Their ultrafast excited-state dynamics govern the outcomes of fundamental photochemical processes, including vision, photoisomerization, photosynthesis, and solar energy conversion. Here, we investigate the ultrafast dynamics of the simplest isolated C=C chromophore, ethylene, and its per-deuterated isotopologue using broadly tunable sub-4 femtosecond pulses in the 150-200 nm range combined with time-resolved photoelectron spectroscopy. Supported by advanced quantum dynamics calculations, our results reveal the important role of the 1B3g(σπ*) state, which is strongly coupled through torsional motion to the optically populated 1B1u(ππ*) state. These findings establish a revised framework for understanding and controlling photochemical reaction in conjugated molecular systems.