The frequency-domain infrared spectrum of ammonia encodes changes in molecular dynamics caused by a DC electric field

The frequency-domain infrared spectrum of ammonia encodes changes in molecular dynamics caused by a DC electric field
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氨的频域红外光谱编码直流电场引起的分子动力学变化

DOI:
10.1073/pnas.1914432116
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发表时间:
2019
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
通讯作者:
Kang, Heon
Kang, Heon
中科院分区:
--
文献类型:
--
作者:
Park, Youngwook;Kang, Hani;Field, Robert W.;Kang, Heon

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氨是特殊的。它是非平面的,但在伞模(ν2)的inv= 1时,它的反转运动比J = 0的Particip 1旋转快。化学家关于电偶极矩的简单概念是否能在旋转、反转和强外电场的竞争中幸存下来?NH3是对称双极小势中隧道效应的一个最受欢迎的教学例子。隧穿是一个动力学概念,但隧穿的定量特征表示在一个静态的,本征态分辨光谱。氨中的倒伞隧穿运动不仅振幅大,而且受外电场的影响很大。我们报道了一个独特的强(高达108 V/m)直流电(DC)电场如何引起一个丰富的详细序列的可逆变化的频域红外光谱(在ν 2伞模式中的v = 0→1跃迁)的氨,在10 K Ar矩阵中自由旋转。虽然光谱是静态的,但编码在其中的是完整的分子间和分子内隧穿动力学图像。
Ammonia is special. It is nonplanar, yet inv= 1 of the umbrella mode (ν2) its inversion motion is faster thanJ= 0↔1 rotation. Does the simplicity of the Chemist's concept of an electric dipole moment survive the competition between rotation, inversion, and a strong external electric field? NH3is a favorite pedagogical example of tunneling in a symmetric double-minimum potential. Tunneling is a dynamical concept, yet the quantitative characteristics of tunneling are expressed in a static, eigenstate-resolved spectrum. The inverting-umbrella tunneling motion in ammonia is both large amplitude and profoundly affected by an external electric field. We report how a uniquely strong (up to 108V/m) direct current (DC) electric field causes a richly detailed sequence of reversible changes in the frequency-domain infrared spectrum (thev= 0→1 transition in the ν2umbrella mode) of ammonia, freely rotating in a 10 K Ar matrix. Although the spectrum is static, encoded in it is the complete inter- and intramolecular picture of tunneling dynamics.
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