Varian sentorr, Instruction Manual, Page: 34 / 36

Appendix
A-3
Relative Ionization Gauge
Substance Formula Gas Correction Factor
Ethyl ether (C
2
H
5
)
2
O 5.1
5.1
Ethylene C
2
H
4
2.3
2.4
2.2
2.2 to 2.5
Ethylene oxide (CH
2
)
2
O 2.5
Helium He 0.18
0.15
0.13
0.12
Heptane C
7
H
16
8.6
Hexadiene:
1.5
·
1.5
·
C
5
H
10
6.4
cyclo
·
CY
·
C
6
H
10
6.0
Hexane C
6
H
14
6.6
Hexene:
1
·
1
·
C
6
H
12
5.9
cyclo
CY
·
C
6
H
10
6.4
Hydrogen H
2
0.46
0.38
0.41
0.45
0.44
Hydrogen Bromide HBr 2.0
Hydrogen Chloride HCl 1.5
1.6
2.0
1.5
Hydrogen Cyanide HCN 1.5
1.6
Hydrogen Floride HF 1.4
Hydrogen Iodide HI 3.1
Hydrogen Sulfide H
2
S 2.2
2.2
2.3
2.1
Iodine I
2 5.4
Iodomethane CH
3
I 4.2
Isoamyl Alcohol C
5
H
11
OH 2.9
Isobutylene C
4
H
8 3.6
Krypton Kr 1.9
1.7
1.7
Lithium Li 1.9
Mercury Hg 3.6
Methane CH
4 1.4
1.5
1.6
1.4 to 1.8
1.5
1.5
Methanol CH
3
OH 1.8
1.9
Mehtyl Acetate CH
3
COOCH
3 4.0
Mythyl ether (CH
3
)
2
O 3.0
3.0
Relative Ionization Gauge
Substance Formula Gas Correction Factor
Naphthalene C
10
H
8
9.7
Neon Ne 0.30
0.31
Nitrobenzene C
6
H
5
NO
2
7.2
Nitrogen N
2
1.0
Nitrotoluene (o
·
, m
·
, p
·
) C
6
H
4
CH
3
NO
2
8.5
Nitric Oxide NO 1.3
1.2
1.0
Nitrous Oxide N
2
O 1.5
1.7
1.7
1.3 to 2.1
Oxygen O
2
1.0
1.1
0.9
0.9
Pentane
n
·
n
·
C
5
H
17
6.2
6.0
5.7
ISO
·
ISO
·
C
5
H
17
6.0
neo
·
(CH
3
)
4
C 5.7
Phenol C
6
H
5
OH 6.2
Phosphine PH
3
2.6
Potassium K 3.6
Propane C
3
H
8
4.2
3.7
3.7 to 3.9
3.6
Propene oxide C
3
H
6
O 3.9
Propene:
n
·
n
·
C
3
H
6
3.3
3.2 to 3.7
cyclo
·
cy
·
C
3
H
6
3.6
Rubidum Rb 4.3
Silver perchlorate AgCIO
4
3.6
Sodium Na 3.0
Stannic iodide SnI
4
6.7
Sulphur Dioxide SO
2
2.1
2.3
Sulphur Hexafloride SF
6
2.3
2.8
Toluene C
6
H
5
CH
3
6.8
Trinitrobenzene C
6
H
3
(NO
2
)
3
9.0
Water H
2
O 1.1
1.0
0.8
Xenon Xe 2.9
2.2
2.4
Xylene:
o
·
o
·
C
6
H
4
(CH
3
)
2
7.8
p
·
p
·
C
6
H
4
(CH
3
)
2
7.9