Extended Data Table 2 Sulphuric acid clusters identified during NPF events

From: Open ocean and coastal new particle formation from sulfuric acid and amines around the Antarctic Peninsula

Mass to charge ratio (mz-1)

Assigned formulae

Potential base identity

Acid:Base ratio

79.960

SO3-

 

1:0

94.983

CH3SO3-

 

1:0

96.960

HSO4-

 

1:0

111.947

SO5-

 

1:0

192.950

H2SO4CH3SO3-

 

2:0

194.928

H2SO4HSO4-

 

2:0

239.994

H2SO4HSO4C2H7N-

C2 amine

2:1

257.012

H2SO4HSO4(CH5N)2-

Methylamine, methylamine

2:2

268.020

H2SO4HSO4C4H11N-

C4 amine

2:1

271.031

H2SO4HSO4C2H7NCH5N-

C2 amine, methylamine

2:2

285.044

H2SO4HSO4(C2H7N)2-

2 C2 amines/Methylamine + C3 amine

2:2

292.905

(H2SO4)2HSO4-

 

3:0

299.048

H2SO4HSO4C2H7NC3H9N-

C2 + C3 amine, methylamine + C4 amine

2:2

313.066

H2SO4HSO4(C3H9N)2-

2 C3 amines, C2 + C4 amine, Methylamine + C5 amine

2:2

327.078

H2SO4HSO4C3H9NC4H11N-

C3 + C4 amines, C2 + C5 amines, Methylamine + C6 amine

2:2

341.093

H2SO4HSO4(C4H11N)2-

2 C4 amines, C3 + C5 amine, C2 + C6 amine, methylamine + C7 amine

2:2

  1. The assigned formulae are assigned tentatively. Potential base identity lists the possible stabilising compounds, presuming that each molecule contains at most 1 nitrogen atom. The acid base ratio states the ratio of H2SO4 or HSO4- to amine in the assigned formula.
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