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Issue 40, 2018
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Probing the band gap of liquid ammonia with femtosecond multiphoton ionization spectroscopy

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Abstract

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.

Graphical abstract: Probing the band gap of liquid ammonia with femtosecond multiphoton ionization spectroscopy

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Publication details

The article was received on 09 Aug 2018, accepted on 01 Oct 2018 and first published on 02 Oct 2018


Article type: Paper
DOI: 10.1039/C8CP05030A
Citation: Phys. Chem. Chem. Phys., 2018,20, 25657-25665

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

    T. Vogler and P. Vöhringer, Phys. Chem. Chem. Phys., 2018, 20, 25657
    DOI: 10.1039/C8CP05030A

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