Unveiling Nonsecular Collisional Dissipation of Molecular Alignment,Physical Review Letters

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Unveiling Nonsecular Collisional Dissipation of Molecular Alignment
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-07-16 , DOI: 10.1103/physrevlett.133.033202
Pu Wang ₁ , Lixin He _{1,

2} , Yu Deng ₁ , Siqi Sun ₁ , Pengfei Lan _{1,

2} , Peixiang Lu _{1,

2,

3}

Affiliation

We conducted a joint theoretical and experimental study to investigate the collisional dissipation of molecular alignment. By comparing experimental measurements to the quantum simulations, the nonsecular effect in the collision dissipation of molecular alignment was unveiled from the gas-density-dependent decay rates of the molecular alignment revival signals. Different from the conventional perspective that the nonsecular collisional effect rapidly fades within the initial few picoseconds following laser excitation, our simulations of the time-dependent decoherence process demonstrated that this effect can last for tens of picoseconds in the low-pressure regime. This extended timescale allows for the distinct identification of the nonsecular effect from molecular alignment signals. Our findings present the pioneering evidence that nonsecular molecular collisional dissipation can endure over an extended temporal span, challenging established concepts and strengthening our understanding of molecular dynamics within dissipative environments.

中文翻译：

揭示分子排列的非世俗碰撞耗散

我们进行了联合理论和实验研究，以研究分子排列的碰撞耗散。通过将实验测量与量子模拟进行比较，分子排列复兴信号的气体密度相关衰减率揭示了分子排列碰撞耗散的非长期效应。与传统观点不同的是，非长期碰撞效应在激光激发后的最初几皮秒内迅速消失，我们对时间相关的退相干过程的模拟表明，这种效应在低压状态下可以持续数十皮秒。这种延长的时间尺度允许从分子排列信号中明确识别非世俗效应。我们的研究结果提供了开创性的证据，表明非世俗分子碰撞耗散可以在较长的时间跨度内持续，挑战既定概念并加强我们对耗散环境中分子动力学的理解。

更新日期：2024-07-16

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