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Variations in atmospheric elemental nitrogen can considerably affect theabundance of major nitrogen-bearing species such as NH$_3$ and HCN. Also, dueto vertical mixing and photochemistry, their abundance deviates from thethermochemical equilibrium. The goal of this study is to understand the effectof atmospheric metallicity on the composition of NH$_3$, N$_2$, and HCN over alarge parameter space in the presence of vertical mixing which, when combinedwith the work on CHO-bearing species in Soni and Acharyya (2023) can provide acomprehensive understanding of the effect of atmospheric metallicity. We usedquenching approximations and a full chemical kinetics model for thecalculations, and a comparison between these two methods was made. Forgenerating thermal profiles, petitRADTRANS code is used. Chemical timescales ofNH$_3$ and N$_2$ are found to be complex functions of metallicity, while HCN isinversely proportional. Using NH$_3$ and CO quenched abundances, the HCNquenched abundance can be constrained since it remains in equilibrium withNH$_3$, CO, and H$_2$O. Quenched NH$_3$ increases with increasing K$_{zz}$untill a particular point, after which it becomes independent of verticalmixing. There is a sweet spot in the K$_{zz}$ parameter space to maximize thequenched HCN for a given T$_{int}$ and T$_{equi}$; the parameter space movestowards the lower equilibrium temperature, and HCN abundance increases withmetallicity. Finally, we used the dataset of quenched abundances to provide alist of potential candidates in which HCN observation can be possible.

Using a quench level approximation to estimate the effect of metallicity on N-bearing species abundances in H2-dominated atmospheres