• AuGe alloy source, mounted on a Jeol type A092 ceramic base.
  • Lifetime in excess of 500 micro-amp hours.
Applications

The aim of the gold source is to provide a source of Au+, Au2+, Au3+ ions for use in ToF SIMS experiments. It has been shown that the use of higher mass projectiles, and especially molecules, in the primary beam results in significant increases in the yield of high mass molecular peaks. This source aims to provide these primary ions, while still maintaining the high spatial resolution typical of an LMIS.

The following tables give yields relative to gallium at the same beam energy for the analyses of two compounds, Irganox 1010 and Gramicidin D.
Below:
Yields from gold clusters relative to gallium yields for Irganox 1010.
Positive SSIMS Data Nagative SSIMS Data
Mass range
Au+ Relative to Ga+
Au2+ Relative to Ga+
Au3+ Relative to Ga+
10-50
0.1
0.2
1
50-100
0.3
1
5
100-200
0.6
3
14
200-400
1.0
3
13
400-1000
1.2
5
24
1000-1500
1.5
9
48
Mass range
Au+ Relative to Ga+
Au2+ Relative to Ga+
Au3+ Relative to Ga+
10-50
0.2
0.4
1
50-100
1.6
23
69
100-200
2.3
39
111
200-400
3.4
45
109
400-1000
2.0
25
70
1000-1500
5.8
90
281
Below:
Yields from gold clusters relative to gallium yields for Gramicidin D.
Positive SSIMS Data Negative SSIMS Data
Mass range
Au+ Relative to Ga+
Au2+ Relative to Ga+
Au3+ Relative to Ga+
10-50
2
5
11
50-100
4
14
30
100-200
7
27
54
200-400
9
33
64
400-1000
7
29
55
1000-1500
7
35
74
Mass range
Au+ Relative to Ga+
Au2+ Relative to Ga+
Au3+ Relative to Ga+
10-50
0.6
1
2
50-100
0.4
7
16
100-200
5
100
179
200-400
8
139
247
400-1000
8
141
260
1000-1500
>10
>100
>1000
Data courtesy of Department of Chemistry, UMIST, Manchester, England.
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