分子超转子气体的声发射
Sound emission from the gas of molecular superrotors
摘要：
我们使用光学离心机将可控量的旋转能量沉积到致密的分子系综中。随后由热碰撞介导的旋转-平移能量转移导致气体的局部加热并产生强声波，其可被裸眼耳朵清楚地听到。对于第一次，声音信号的振幅作为实验测量的旋转能量的函数进行分析。两个实验观测值之间的比例关系证实了旋转激励是检测到的声波的主要来源。由于几乎所有的分子，包括大气中的主要成分，都可以通过离心机进行激光旋转，我们预计这项工作将刺激光声控制和光谱学领域的进一步发展。
英文摘要：
We use an optical centrifuge to deposit a controllable amount of rotational energy into dense molecular ensembles. Subsequent rotation-translation energy transfer, mediated by thermal collisions, results in the localized heating of the gas and generates strong sound wave, clearly audible to the unaided ear. For the first time, the amplitude of the sound signal is analyzed as a function of the experimentally measured rotational energy. The proportionality between the two experimental observables confirms that rotational excitation is the main source of the detected sound wave. As virtually all molecules, including the main constituents of the atmosphere, are amenable to laser spinning by the centrifuge, we anticipate this work to stimulate further development in the area of photo-acoustic control and spectroscopy.
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