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

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