Modulation of period of quantum beats from optical emissions from the excited electronic states of mercury triatomic clusters
Modulation of period of quantum beats from optical emissions from the excited electronic states of mercury triatomic clusters
复制标题
汞三原子簇激发电子态光发射的量子拍周期调制
DOI：
10.1016/s0379-6779(01)00471-4
复制
发表时间：
2001
期刊：
影响因子：
4.4
通讯作者：
A. Vourdas
中科院分区：
文献类型：
--
作者：
E. Sarantopoulou;Constantine Skordoulis;A. Cefalas;A. Vourdas
这篇简短的文章旨在证明，处于火山形状激发电子态的金属团簇表明量子双态功能。使用了两种不同类型的实验构型，时间分辨/激光诱导荧光和质谱学。第一种是在10−6mbar的背景压力下，将太阳盲光倍增管或二次电子倍增管永久连接到真空紫外单色仪的两个狭缝中的一个狭缝上。它被用于探测157 nm处的激光和真空紫外光散射(校准、对准)[1]。如文献[2]所示，用连接到真空紫外单色仪第二狭缝的可见光电倍增管检测光谱可见部分的光信号。这包括标准的VUV-VIS实验配置。分子束装置将真空室内的本底压力维持在尽可能低的水平，只与质谱学实验相联系。除了激光诱导荧光技术外，质谱学技术也被用于不同类型的实验的改进配置[4])。时间分辨和激光诱导荧光光谱[2]支持485 nm(Hg3∗)谱带的归属[3]。信号的时间演化呈现出典型量子拍子的结构。相干叠加是基于激发电子态在势垒中的平移对称性使激发电子态分裂成对称和反对称电子态[5]。它解释了实验结果，即如理论[4]所预期的那样，只在势垒顶部附近观察到两到三个振动能级的量子节拍。在事件的时间尺度之后，图1，
The short article was intended to demonstrate that metallic clusters in excited electronic states of volcanic shape, indicate quantum bi-state functionality. Two different types of experimental configurations were used, time resolved/laser induced fluorescence and mass spectroscopy. In the first, the solar blind photomultiplier or the secondary electron multiplier were permanently connected to one of the two slits of the VUV monochromator under background pressure of 10− 6 mbar. It was used to detect laser and VUV scattered light at 157nm (calibration, alignment)[1]. Optical signals in the visible part of the spectrum were detected with visible PMT tubes connected to the second slit of the VUV monochromator as in [2]. This consists the standard VUV-Vis experimental configuration. The molecular beam apparatus maintained the background pressure inside the vacuum chamber as low as possible connected only with the mass spectroscopic experiments (... Besides the laser induced fluorescence techniques, mass spectroscopic techniques were employed as well in a modified configuration used for different type of experiments [4]). The assignment of the 485 nm (Hg3∗) band [3], was supported by time resolved and laser induced fluorescence spectroscopy [2]. The time evolution of signals exhibited the structure of typical quantum beats. Coherent superposition was based on the splitting of the excited electronic state in a symmetric and an anti-symmetric one from the translation symmetry of the excited electronic states in the potential barrier [5]. It explains the experimental result that quantum beats were observed only for two or three vibronic levels near the top of the potential barrier as it is expected from theory [4]. Following the time scale of the events, Fig. 1,