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RGA Spectra Data – Interpretation Guide

See legend below for explanations

AMU #

CHEMICAL SYMBOL

SOURCES

1

H

Water Fragment or Hydrogen Fragment

2

H2, D

Hydrogen, Deuterium (H2)

3

HD, H3

Hydrogen Deuterium, Tritium (H3)

4

He

Helium

5

 

No known elements

6

C++

Doubly Ionized C12 (Rare)

7

N++

Doubly Ionized N14 (Rare)

8

O++

Doubly Ionize O16 (Rare)

9

 

No known elements

10

Ne++

Doubly Ionized Ne20 (Rare)

11

Ne++

Doubly Ionized Ne22 (Rare)

12

C

Carbon, Carbon Monoxide Fragment, Carbon Dioxide Fragment

13

CH, C13

Methane Fragment, Carbon Isotope

14

N, CH2

Nitrogen, Methane Fragment or See Note 1

15

CH3

Methane Fragment or See Note 1

16

O, CH4, NH2

Oxygen or Carbon Monoxide Fragment, Methane Parent Ion, Ammonia Fragment

17

OH, NH3

Water Fragment, Ammonia Parent Ion

18

H2O

Water Parent Ion

19

F

Fluorine or Freon Fragment

20

Ar++, Ne, NF

Doubly Ionized Argon, Neon Hydrofluroic Acid

21

 

No known elements

22

Ne22

Neon Isotope

23

 

No known elements

24

C2

See Note 1

25

C2H

See Note 1

26

C2H2, CN

See Note 1, Hydrogen Cyanide Fragment

27

C2H3, Al, HCN

See Note 1, Aluminum, Hydrogen Cyanide

28

N2, CO, C2H4, Si

Nitrogen, Carbon Monoxide, Ethylene Parent Ion, Silicon

29

CH3CH2

Ethane Fragment or Ethanol Fragment or Isopropyl Alcohol Fragment

30

C2H6, NO

Ethane Parent, Nitric Oxide

31

P, CH2OH, CF

Phosphorus, Methanol Fragment, Ethanol Fragment, Freon Fragment

32

O2, CH3OH, S

Oxygen, Methanol Parent Ion, Sulfur

33

HS

Hydrogen Sulfide Fragment

34

H2S, S34

Hydrogen Sulfide Parent Ion, Sulfur Isotope

35

Cl

Chlorine Isotope, See Note 2

36

HCl, Ar36

Hydrochloric Acid, Argon Isotope

37

Cl37

Chlorine Isotope, See Note 2

38

HCl37

Hydrochloric Acid or See Note 2

39

C3H3

See Note 3

40

Ar, C3H4

Argon, See Note 1

41

C3 H5

See Note 1

42

C3 H6

See Note 1

43

C3H7, CH3CO

See Note 1, Acetone Fragment or Methyl Ethyl Ketone Fragment

44

CO2, C3H8

Carbon Dioxide, See Note 3

45

CH3CH2O

Ethanol Fragment or Isopropyl Alcohol Fragment

46

CH3CH2OH

Ethanol Parent Ion

47

CCl35

See Note 2

48

HCCl35, SO

See Note 2, Sulfur Dioxide Fragment

49

CCl37, SiOH

See Note 2, Pump Oil Fragment

50

CCl37, CF2, C4H2

See Note 2, Freon Fragment, See Note 3

Legend

  1. Fragments of several hydrocarbons, such as mechanical pump oil, diffusion pump oil, vacuum grease, cutting oil, and organic solvents.
  2. Fragments of several chlorinated hydrocarbons such as carbon tetrachloride, trichlorethylene and many Freons.
  3. Fragments from both straight chain hydrocarbons and benzene ring hydrocarbons.