高度な興奮状態のローミング:三原子分子分解の中央原子除去

Zhenxing Li¹, Yan-Lin Fu¹, Zijie Luo^1,2

¹State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P. R. China.

Science (New York, N.Y.)

|February 15, 2024

まとめ

非伝統的な反応経路である分子ローミングは,SO2光解離の高度に興奮した状態で観察される. このメカニズムは振動的に熱い硫黄一酸化物と酸素の断片を生成し伝統的な最小エネルギー経路の仮定に挑戦します

科学分野:

化学物理学
写真化学
反応ダイナミクス

背景:

化学反応は通常,最小エネルギー経路 (MEP) に従う.
MEPから逸脱するローミングは,地面と最初の興奮状態で知られている.
高度な興奮状態でのローミングはほとんど確立されていません.

研究の目的:

SO2光解離の高度に興奮した状態での解離経路を調査する.
ローミングメカニズムが非常に興奮した状態で発生するかどうかを判断する.
異なる解離経路で生成された断片を特徴づける.

主な方法:

非常に興奮した状態でSO2の光解離.
解離産物,特にS ((1D) とO ((a1Δg) 断片の分析
O2 ((a1Δg) の振動状態を決定するスペクトロスコピクによる特徴付け.

主要な成果:

SO2の光解離には2つの解離経路が特定された.
1つの経路はMEPをたどり,振動的に冷たいO2 ((a1Δg) を生成した.
ローミングを含む第二の経路は,分子内抽出によって振動的により熱いO2 (a1Δg) を生成した.

結論:

ローミングダイナミクスは,分子光解離の非常に興奮した状態で発生することが確認されています.
このローミングメカニズムは,分子内O抽象化と方向転換運動を含みます.
ローミングは,非常に興奮した状態の分子光解離における一般的なメカニズムであり,例外ではない.

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