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1. The UV Spectrum of the Lyman‐Birge‐Hopfield Band System of N ₂ Induced by Cascading from Electron Impact

   https://doi.org/10.1029/2019JA027546  

   Ajello, Joseph M.; Evans, J. Scott; Veibell, Victoir; Malone, Charles P.; Holsclaw, Greg M.; Hoskins, Alan C.; Lee, Rena A.; McClintock, William E.; Aryal, Saurav; Eastes, Richard W.; et al (March 2020, Journal of Geophysical Research: Space Physics)
2. Theoretical study of vibrational excitation and dissociative electron attachment of NO ₂ by an electron impact

   https://doi.org/10.1088/1742-6596/1412/17/172002  

   Liu, H; Santos, S F; Yuen, C; Cortona, P; Kokoouline, V; Ayouz, M (January 2020, Journal of Physics: Conference Series)
3. The UV Spectrum of the Lyman-Birge-Hopfield Band System of N2 Induced by Cascading from Electron Impact

   https://doi.org/https://doi.org/10.1029/2019JA027546  

   Joseph M. Ajello1, J. Scott (January 2020, Journal geographic)

   null (Ed.)

   We have measured in the laboratory the far ultraviolet (FUV: 125.0–170.0 nm) cascade-induced spectrum of the Lyman-Birge-Hopfield (LBH) band system (a 1Πg → X 1Σg+) of N2 excited by 30–200 eV electrons. The cascading transition begins with two processes: radiative and collision-induced electronic transitions (CIETs) involving two states (a′ 1Σu− and w 1Δu → a 1Πg), which are followed by a cascade induced transition a 1Πg → X 1Σg+. Direct excitation to the a-state produces a confined LBH spectral glow pattern around an electron beam. We have spatially resolved the electron induced glow pattern from an electron beam colliding with N2 at radial distances of 0–400 mm at three gas pressures. This imaging measurement is the first to isolate spectral measurements in the laboratory of single-scattering electron-impact-induced-fluorescence from two LBH emission processes: direct excitation, which is strongest in emission near the electron beam axis; and cascading-induced, which is dominant far from the electron beam axis. The vibrational populations for vibrational levels from v′=0–2 of the a 1Πg state are enhanced by CIETs, and the emission cross sections of the LBH band system for direct and cascading-induced excitation are provided at 40, 100, and 200 eV 

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4. Electron doping of a double-perovskite flat-band system

   https://doi.org/10.1073/pnas.2218997120  

   Jin, Lun; Varnava, Nicodemos; Ni, Danrui; Gui, Xin; Xu, Xianghan; Xu, Yuanfeng; Bernevig, B Andrei; Cava, Robert J (February 2023, Proceedings of the National Academy of Sciences)

   Electronic structure calculations indicate that the Sr₂FeSbO₆double perovskite has a flat-band set just above the Fermi level that includes contributions from ordinary subbands with weak kinetic electron hopping plus a flat subband that can be attributed to the lattice geometry and orbital interference. To place the Fermi energy in that flat band, electron-doped samples with formulas Sr_2-xLa_xFeSbO₆(0 ≤x≤ 0.3) were synthesized, and their magnetism and ambient temperature crystal structures were determined by high-resolution synchrotron X-ray powder diffraction. All materials appear to display an antiferromagnetic-like maximum in the magnetic susceptibility, but the dominant spin coupling evolves from antiferromagnetic to ferromagnetic on electron doping. Which of the three subbands or combinations is responsible for the behavior has not been determined. 

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5. Impact of substrate induced band tail states on the electronic and optical properties of MoS ₂

   https://doi.org/10.1063/1.5131270  

   Klein, J.; Kerelsky, A.; Lorke, M.; Florian, M.; Sigger, F.; Kiemle, J.; Reuter, M. C.; Taniguchi, T.; Watanabe, K.; Finley, J. J.; et al (December 2019, Applied Physics Letters)

   null (Ed.)