Graphical representation of the efficiency of collision processes on H₂ states at 5000 K, shown in terms of state energy on the y-axis and vibrational quantum number v on the x-axis. The left (blue) vertical bar for each state has a height proportional to the associative detachment rate coefficient (H⁻ + H → H₂(υ, J) + e) from Launay et al. (1991). The right (orange-red) vertical bar for each state has a height proportional to the collisional dissociation rate coefficient (H₂(υ, J) + H → 3H) from Bossion et al. (2018). The length scales are arbitrarily chosen in each case so that the relative proportions can be seen. For each state (υ, J), the de-excitation (most cases) or excitation transition (H₂(υ, J) + H → H₂(υ′, J′) + H) with the highest rate coefficient k is shown with a grey line; data from Bossion et al. (2018).