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Table 1 Known compounds used as training set

From: Automated fragment formula annotation for electron ionisation, high resolution mass spectrometry: application to atmospheric measurements of halocarbons

Compound

Chemical name

Chemical formula

Monoisotopic molecular mass Da

CAS number

\(\text {C}_{{2}}\text {H}_{{6}}\)

Ethane

\(\text {C}_{{2}}\text {H}_{{6}}\)

30.04695

74-84-0

\(\text {C}_{{3}}\text {H}_{{8}}\)

Propane

\(\text {C}_{{3}}\text {H}_{{8}}\)

44.06260

74-98-6

\(\text {CH}_{{3}}\)Cl

Chloromethane

\(\text {CH}_{{3}}\)Cl

49.99233

74-87-3

COS

Carbonyl sulphide

COS

59.96699

463-58-1

\(\text {NF}_{{3}}\)

Nitrogen trifluoride

\(\text {NF}_{{3}}\)

70.99828

7783-54-2

Benzene

Benzene

\(\text {C}_{{6}}\text {H}_{{6}}\)

78.04695

71-43-2

\(\text {CH}_{{2}}\text {Cl}_{{2}}\)

Dichloromethane

\(\text {CH}_{{2}}\text {Cl}_{{2}}\)

83.95336

75-09-2

HCFC-22

Chlorodifluoromethane

\(\text {HCF}_{{2}}\)Cl

85.97348

75-45-6

\(\text {CF}_{{4}}\)

Tetrafluoromethane

\(\text {CF}_{{4}}\)

87.99361

75-73-0

Toluene

Toluene

\(\text {C}_{{7}}\text {H}_{{8}}\)

92.06260

108-88-3

\(\text {CH}_{{3}}\)Br

Bromomethane

\(\text {CH}_{{3}}\)Br

93.94181

74-83-9

HCFC-142b

1-chloro-1,1-difluoroethane

\(\text {H}_{{3}}\text {C}_{{2}}\text {F}_{{2}}\)Cl

99.98913

75-68-3

\(\text {SO}_{{2}}\text {F}_{{2}}\)

Sulfuryl difluoride

\(\text {SO}_{{2}}\text {F}_{{2}}\)

101.95871

2699-79-8

CFC-13

Chlorotrifluoromethane

\(\text {CF}_{{3}}\)Cl

103.96406

75-72-9

HCFC-141b

1,1-dichloro-1-fluoroethane

\(\text {H}_{{3}}\text {C}_{{2}}\text {FCl}_{{2}}\)

115.95958

1717-00-6

\(\text {CHCl}_{{3}}\)

Chloroform

\(\text {CHCl}_{{3}}\)

117.91438

67-66-3

CFC-12

Dichlorodifluoromethane

\(\text {CF}_{{2}}\text {Cl}_{{2}}\)

119.93451

75-71-8

\(\text {C}_{{2}}\text {HCl}_{{3}}\)

1,1,2-trichloroethene

\(\text {C}_{{2}}\text {HCl}_{{3}}\)

129.91438

79-01-6

CFC-11

Trichlorofluoromethane

\(\text {CFCl}_{{3}}\)

135.90496

75-69-4

HCFC-124

2-chloro-1,1,1,2-tetrafluoroethane

\(\text {HC}_{{2}}\text {F}_{{4}}\)Cl

135.97029

2837-89-0

PFC-116

Perfluoroethane

\(\text {C}_{{2}}\text {F}_{{6}}\)

137.99042

76-16-4

\(\text {CH}_{{3}}\)I

Iodomethane

\(\text {CH}_{{3}}\)I

141.92795

74-88-4

\(\text {SF}_{{6}}\)

Sulfur hexafluoride

\(\text {SF}_{{6}}\)

145.96249

2551-62-4

Halon-1301

Bromo(trifluoro)methane

\(\text {CF}_{{3}}\)Br

147.91355

75-63-8

\(\text {CCl}_{{4}}\)

Tetrachloromethane

\(\text {CCl}_{{4}}\)

151.87541

56-23-5

CFC-115

1-chloro-1,1,2,2,2-pentafluoroethane

\(\text {C}_{{2}}\text {F}_{{5}}\)Cl

153.96087

76-15-3

\(\text {C}_{{2}}\text {Cl}_{{4}}\)

1,1,2,2-tetrachloroethene

\(\text {C}_{{2}}\text {Cl}_{{4}}\)

163.87541

127-18-4

Halon-1211

Bromochlorodifluoromethane

\(\text {CF}_{{2}}\)ClBr

163.88400

353-59-3

CFC-114

1,2-dichloro-1,1,2,2-tetrafluoroethane

\(\text {C}_{{2}}\text {F}_{{4}}\text {Cl}_{{2}}\)

169.93132

76-14-2

\(\text {CH}_{{2}}\text {Br}_{{2}}\)

Dibromomethane

\(\text {CH}_{{2}}\text {Br}_{{2}}\)

171.85233

74-95-3

CFC-113

1,1,2-trichloro-1,2,2-trifluoroethane

\(\text {C}_{{2}}\text {F}_{{3}}\text {Cl}_{{3}}\)

185.90177

76-13-1

PFC-218

Perfluoropropane

\(\text {C}_{{3}}\text {F}_{{8}}\)

187.98723

76-19-7

\(\text {SF}_{{5}}\text {CF}_{{3}}\)

Pentafluoro(trifluoromethyl)sulfur

\(\text {SF}_{{5}}\text {CF}_{{3}}\)

195.95930

373-80-8

PFC-c318

Octafluorocyclobutane

\(\text {C}_{{4}}\text {F}_{{8}}\)

199.98723

115-25-3

Halon-2402

1,2-dibromo-1,1,2,2-tetrafluoroethane

\(\text {C}_{{2}}\text {F}_{{4}}\text {Br}_{{2}}\)

257.83029

124-73-2

\(\text {C}_{{6}}\text {F}_{{14}}\)

Perfluorohexane

\(\text {C}_{{6}}\text {F}_{{14}}\)

337.97764

355-42-0

  1. These 36 substances are routinely measured within the AGAGE network [40]. Identification and quantification of these compounds have been done by [41,42,43,44]. Present chemical elements are: H, C, N, O, F, S, Cl, Br and I. These are the chemical elements used as input for the knapsack algorithm. SMILES codes can be found in the Additional file 1. The corresponding latex document is the Additional file 6