In 40 ATLASGAL clumps, X(o-H2D+) falls about 6 times while X(N2D+) falls about 3 times with evolution, so the o-H2D+/N2D+ ratio is not confirmed as an evolutionary indicator; R_D = N2D+/N2H+ drops by nearly an order of magnitude.
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Time evolution of o-H$_2$D$^+$, N$_2$D$^+$, and N$_2$H$^+$ during the high-mass star formation process
In 40 ATLASGAL clumps, X(o-H2D+) falls about 6 times while X(N2D+) falls about 3 times with evolution, so the o-H2D+/N2D+ ratio is not confirmed as an evolutionary indicator; R_D = N2D+/N2H+ drops by nearly an order of magnitude.