Table 2 Average mass spectra

From: Increased ionization supports growth of aerosols into cloud condensation nuclei

UV

Gamma

Mass

Mass w. water

%

—

m/q

m/q

0

Off

258

280

25

Off

177

214

25

On

174

209

50

Off

189

227

70

Off

183

220

70

On

175

212

  1. Each line shows the conditions and average m/q for a 4-h API-ToF mass spectrum without the CI. Column 1 shows the UV level as percentage of maximum power. Column 2 shows whether the γ-ray sources were on or off. Column 3 is the average m/q of the spectrum. Column 4 is the average mass of the spectrum, when 1 water (m/q 18) has been added to all masses except the first four sulfuric acid peaks (m/q 97, 195, 293, 391) which has 1.5 water per sulfuric acid
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