Experimental, ADO, ACCSA and QM rate coefficients (in cm³ s⁻¹ × 10⁻⁹) for the charge transfer reactions between Xe⁺, Kr⁺ or Ar⁺ ions and the two ammonia isotopologues of interest. The experimental uncertainty in the last decimal place is stated in parentheses; for example, k_exp = (0.36 ± 0.02) × 10⁻⁹ cm³ s⁻¹ for the Xe⁺ + NH₃ system at 260 K (see ESI for details on the calculations). Previous work conducted at 300 K is included for comparison.

Reaction system	k exp	k H/kD	k ADO	k ACCSA	k QM	Temperature (K)
Xe+ + NH3	0.6(1)a		1.65	2.13		300
	0.8(2)b
	0.36(2)c		1.74	2.25	0.28	260
Xe+ + ND3	1.2(2)c	0.30(5)	1.60	2.12	0.25	255
Kr+ + NH3	0.8(2)a		1.71	2.20		300
	0.7(1)b
	0.51(5)		1.82	2.38	0.34	246
Kr+ + ND3	1.0(3)	0.5(2)	1.69	2.26	0.30	239
Ar+ + NH3	1.8(4)a		1.86	2.40		300
	1.4(2)		2.11	2.78	0.38	204
Ar+ + ND3	1.7(5)	0.8(3)	2.00	2.70	0.35	194

^aDerai et al.³⁴

^bGiles et al.³⁵

^cPetralia et al.⁷