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arXiv 2402.01043physics.chem-ph
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黑体辐射与热效应对腔内化学反应和相变的影响

Blackbody radiation and thermal effects on chemical reactions and phase transitions in cavities

Sindhana Pannir-Sivajothi, Joel Yuen-Zhou

AI总结:

本文通过计算腔内反应分子与外部空气的温差,研究黑体辐射和热效应对腔内化学反应及相变的影响,发现反应温差可忽略、理想腔可改变相变温度但真实腔中该效应消失,并揭示红外腔与自由空间黑体光谱能量密度的显著差异及其对暗态反应活性的潜在作用。

摘要:

极化激元化学中的一个重要问题是,反应中的分子是否与其周围环境处于热平衡。如果不是,那么实验中观察到的腔内分子反应速率的变化(即使没有光泵浦)能否归因于腔内温度更高或更低?在这项工作中,我们通过计算腔内反应分子与外部空气之间的温度差来回答这个问题。我们发现对于大多数反应而言,这一温度差可以忽略不计。另一方面,对于腔内的相变,由于实验中材料的温度由加热/冷却源主动维持,我们证明当反射镜和腔窗是理想的(非吸收的)时,腔可以改变观测到的相变温度;然而,当使用真实的反射镜和窗口时,这种改变会消失。最后,我们发现自由空间与红外腔之间的黑体光谱能量密度存在显著差异,这揭示了共振效应,并可能在解释暗态下化学反应活性的变化中发挥作用。

英文摘要:

An important question in polariton chemistry is whether reacting molecules are in thermal equilibrium with their surroundings. If not, can experimental changes observed in reaction rates of molecules in a cavity (even without optical pumping) be attributed to a higher/lower temperature inside the cavity? In this work, we address this question by computing temperature differences between reacting molecules inside a cavity and the air outside. We find this temperature difference to be negligible for most reactions. On the other hand, for phase transitions inside cavities, as the temperature of the material is actively maintained by a heating/cooling source in experiments, we show cavities can modify observed transition temperatures when mirrors and cavity windows are ideal (non-absorbing); however, this modification vanishes when real mirrors and windows are used. Finally, we find substantial differences in blackbody spectral energy density between free space and infrared cavities, which reveal resonance effects and could potentially play a role in explaining changes in chemical reactivity in the dark.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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