. Author manuscript; available in PMC: 2015 Oct 8.

Published in final edited form as: Rapid Commun Mass Spectrom. 2012 Oct 15;26(19):2211–2223. doi: 10.1002/rcm.6335

Table 2.

Percentage decrease in K₀ values, %ΔK₀, for selected ions when modifiers were introduced into the buffer gas. The concentrations of modifier increased in the buffer gas from 0 to 1.7, 0.95, and 6.8 mmol m⁻³ for ethyl lactate, nitrobenzene, and 2-butanol, respectively; for ethyl lactate clusters, ethyl lactate increased in the buffer gas from 0.33 (12 ppmv) to 1.7 mmol m⁻³. Differences of less than 0.32 units in %ΔK₀ may arise from the maximum accepted standard deviation of the drift time measurements (0.05 ms).

	Modifiers

Ions	Ethyl lactate	Nitrobenzene	2-butanol
2,4-Lutidine.H⁺	24	13	5.6^b

L_nH⁺	6.4

L_nH₃O⁺	10

L_nN_a⁺	4.3

Arginine.H⁺	9.8	2.7	0.3

Atenolol.H⁺	7.0	2.0	0.7^a

Desipramine.H⁺	12	3.0	1.1

DTBP.H⁺	1.5	0.1	2.2^b

Ethanolamine.H⁺	41	37	19

Histidine.H⁺	4.1	2.3	1.1

Lysine.H⁺	4.3	2.1	1.1

Serine.H⁺	30	25	14^b

TBA	0.3	0.1	0.3^b

TEA	0.5	0.3	1.0^b

TMA	1.0	1.0	1.0^b

TPA	0.1	0.5	0.0^b

Valinol.H⁺	28	21	9.8^b

Average %ΔK₀ at 100, 150, 200, and 250°C.

Reference 36. Differences of less than 0.32 units in %ΔK₀ may arise from the standard deviation of the drift time measurements (0.05 ms).