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1. The Contribution of N ⁺ Ions to Earth's Polar Wind

   https://doi.org/10.1029/2020GL089321  

   Lin, Mei‐Yun; Ilie, Raluca; Glocer, Alex (September 2020, Geophysical Research Letters)

   Abstract The escape of heavy ions from the Earth atmosphere is a consequence of energization and transport mechanisms, including photoionization, electron precipitation, ion‐electron‐neutral chemistry, and collisions. Numerous studies considered the outflow of O⁺ions only, but ignored the observational record of outflowing N⁺. In spite of 12% mass difference, N⁺and O⁺ions have different ionization potentials, ionospheric chemistry, and scale heights. We expanded the Polar Wind Outflow Model (PWOM) to include N⁺and key molecular ions in the polar wind. We refer to this model expansion as the Seven Ion Polar Wind Outflow Model (7iPWOM), which involves expanded schemes for suprathermal electron production and ion‐electron‐neutral chemistry and collisions. Numerical experiments, designed to probe the influence of season, as well as that of solar conditions, suggest that N⁺is a significant ion species in the polar ionosphere and its presence largely improves the polar wind solution, as compared to observations. 

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2. The Role of Tunneling in the Spectra of H ₅ ⁺ and D ₅ ⁺ up to 7300 cm ^-1

   https://doi.org/10.1021/acs.jpca.0c02299  

   Boyer, Mark A.; Chiu, Chloe S.; McDonald, David C.; Wagner, J. Philipp; Colley, Jason E.; Orr, Dylan S.; Duncan, Michael A.; McCoy, Anne B. (May 2020, The Journal of Physical Chemistry A)

   The spectra for H5+ and D5+ are extended to cover the region between 4830 and 7300 cm−1. These spectra are obtained using mass-selected photodissociation spectroscopy. To understand the nature of the states that are accessed by the transitions in this and prior studies, we develop a four-dimensional model Hamiltonian. This Hamiltonian is expressed in terms of the two outer H2 stretches, the displacement of the shared proton from the center of mass of these two H2 groups, and the distance between the H2 groups. This choice is motivated by the large oscillator strength associated with the shared proton stretch and the fact that the spectral regions that have been probed correspond to zero, one, and two quanta of excitation in the H2 stretches. This model is analyzed using an adiabatic separation of the H2 stretches from the other two vibrations and includes the non-adiabatic couplings between H2 stretch states with the same number of quanta of excitation in the H2 stretches. Based on the analysis of the energies and wave functions obtained from this model, we find that when there are one or more quanta of excitation in the H2 stretches the states come in pairs that reflect tunneling doublets. The states accessed by the transitions in the spectrum with the largest intensity are assigned to the members of the doublets with requisite symmetry that are localized on the lowest-energy adiabat for a given level of H2 excitation. 

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3. Beta decay of ⁶⁶ Mn to the N = 40 nucleus ⁶⁶ Fe

   https://doi.org/10.1088/1361-6471/aa915e  

   Olaizola, B; Fraile, L M; Mach, H; Poves, A; Aprahamian, A; Briz, J A; Cal-González, J; Ghiţa, D; Köster, U; Kurcewicz, W; et al (December 2017, Journal of Physics G: Nuclear and Particle Physics)
4. Thermodynamics and Reaction Mechanisms for Decomposition of a Simple Protonated Tripeptide, H ⁺ GGA: From H ⁺ GGG to H ⁺ GAG to H ⁺ GGA

   https://doi.org/10.1021/jasms.1c00345  

   Mookherjee, Abhigya; Armentrout, P. B. (February 2022, Journal of the American Society for Mass Spectrometry)
5. Using phase-space Gaussians to compute the vibrational states of OCHCO ⁺

   https://doi.org/10.1063/1.5096770  

   Pandey, Ankit; Poirier, Bill (July 2019, The Journal of Chemical Physics)