首页> 外文会议>Quantum Electronics Conference amp; Lasers and Electro-Optics (CLEO/IQEC/PACIFIC RIM), 2011 >Chemistry at the threshold: Unexpected products, unusual mechanisms, and generally weird things that happen near the energetic threshold for a reaction
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Chemistry at the threshold: Unexpected products, unusual mechanisms, and generally weird things that happen near the energetic threshold for a reaction

机译:处于临界状态的化学反应:意外的产物,异常的机制以及通常在反应的高能阈值附近发生的怪异现象

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Reactions that occur near the energetic threshold can be very different to those where energy is in excess. In a series of experiments, we have used a narrow linewidth laser to provide a small organic molecule, acetaldehyde (CH3CHO), with a precise amount of energy, and used laser and imaging based techniques to probe the reaction products. In this paper I shall present three different examples of "weird chemistry" that happens at threshold: i) two fragments of acetaldehyde, CH3 and HCO almost separate but are trapped in their mutual van der Waals well. Here they orbit each other and produce different chemical products; ii) selectively deuterated acetaldehyde is observed to undergo facile and unexpected H/D exchange before the reaction is complete; and iii) as soon as there is enough energy to break more than one bond, this channel becomes dominant, but the mechanism for this dominance is as yet unexplained. Near-threshold chemistry is not an esoteric, narrow window, but one that is prevalent in chemistry more generally. Examples in atmospheric and combustion chemistry will be presented.
机译:在能量阈值附近发生的反应可能与能量过量的反应有很大不同。在一系列实验中,我们使用了窄线宽激光来提供具有精确能量的小有机分子乙醛(CH3CHO),并使用了基于激光和成像技术来探测反应产物。在本文中,我将介绍三个在阈值处发生的“怪异化学”的不同示例:i)乙醛,CH3和HCO的两个片段几乎分开,但很好地被它们的相互范德华捕获。它们在这里彼此绕行,并产生不同的化学产品。 ii)在反应完成之前,观察到选择性氘代的乙醛进行了容易的和意外的H / D交换; iii)一旦有足够的能量打破一个以上的键,该通道便成为主导,但这种主导的机制尚无法解释。近阈值化学不是一个深奥的,狭窄的窗口,而是在化学中更为普遍的一个窗口。将介绍大气化学和燃烧化学的例子。

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