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1. Rainbow scattering in rotationally inelastic collisions of HCl and H ₂

   https://doi.org/10.1063/5.0043658  

   Morita, Masato; Zuo, Junxiang; Guo, Hua; Balakrishnan, Naduvalath (March 2021, The Journal of Chemical Physics)
2. A chemical dynamics study of the HCl + HCl+ reaction

   https://doi.org/10.1016/j.ijms.2020.116515  

   Luo, Yuheng; Kreuscher, Thomas; Kang, Christopher; Hase, William L.; Weitzel, Karl-Michael; Sun, Rui (April 2021, International Journal of Mass Spectrometry)
3. Globally Accurate Full-Dimensional Potential Energy Surface for H ₂ + HCl Inelastic Scattering

   https://doi.org/10.1021/acs.jpca.9b05958  

   Yao, Qian; Morita, Masato; Xie, Changjian; Balakrishnan, Naduvalath; Guo, Hua (July 2019, The Journal of Physical Chemistry A)
4. Predissociation dynamics of the HCl–(H ₂ O) ₃ tetramer: An experimental and theoretical investigation

   https://doi.org/10.1063/1.5026585  

   Zuraski, Kristen; Wang, Qingfeng; Kwasniewski, Daniel; Bowman, Joel M.; Reisler, Hanna (May 2018, The Journal of Chemical Physics)
5. Rovibrational Transitions in HCl due to Collisions with H ₂ : Spin-free and Hyperfine-resolved Transitions

   https://doi.org/10.3847/1538-4357/ad4da9  

   Hoffman, Daniel; Taylor, Josiah; Price, T_J; Forrey, Robert_C; Yang, B_H; Stancil, P_C; Zhang, Z_E; Balakrishnan, N. (June 2024, The Astrophysical Journal)

   Abstract Hydrogen chloride (HCl) is a key repository of chlorine in the interstellar medium. Accurate determinations of its abundance are critical to assessing the chlorine elemental abundance and constraining stellar nucleosynthesis models. To aid in modeling recent and future observations of HCl rovibrational spectra, we present cross sections and rate coefficients for collisions between HCl and molecular hydrogen. Transitions between rovibrational states of HCl are considered for temperatures ranging from 10 to 3000 K. Cross sections are computed using a full dimensional quantum close-coupling (CC) method and a reduced dimensionality coupled-states (CS) approach. The CS results, benchmarked against the CC results, are used with a recoupling approach to calculate hyperfine-resolved rate coefficients for rovibrational transitions of HCl induced by H₂. The rate coefficients will allow for a better determination of the HCl abundance in the interstellar medium and an improved understanding of interstellar chlorine chemistry. We demonstrate the utility of the new rate coefficients in a nonthermodynamic equilibrium radiative transfer model applied to observations of HCl rovibrational transitions in a circumstellar shell. 

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