Probing the band gap of liquid ammonia with femtosecond multiphoton ionization spectroscopy.

Probing the band gap of liquid ammonia with femtosecond multiphoton ionization spectroscopy.
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用飞秒多光子电离光谱探测液氨的带隙

DOI:
10.1039/c8cp05030a
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发表时间:
2018
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
P. Vöhringer
P. Vöhringer
中科院分区:
--
文献类型:
--
作者:
T. Vogler;P. Vöhringer

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电子带隙,即价带顶部与导带底部之间的能量差,被广泛认为是表征散装液体和液体溶剂(如水或氨)电子结构的关键性质。本文以溶剂化电子一次产额作为近红外作用光谱探针,利用2光子电离光谱研究了270 K和300 bar下液氨的带隙。通过实验确定的逃逸概率,即电离后第一个纳秒内能够避免双相重组的溶剂化电子的比例,可以提取出液体的垂直电子亲和值为−(1.27±0.03)eV。
The electronic band gap, i.e. the energy difference between the top of the valence band and the bottom of the conduction band, is widely recognized as the key property characterizing the electronic structure of bulk liquids and liquid solvents like water or ammonia. Here, the band gap of liquid ammonia at 270 K and 300 bar was studied with 2-photon ionization spectroscopy using the solvated electron primary yield as a near-infrared action-spectroscopic probe. The experimentally determined escape probability, which is the fraction of solvated electrons that is able to avoid geminate recombination within the first nanosecond after ionization, was used to extract a value of −(1.27 ± 0.03) eV for the vertical electron affinity of the liquid.
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