Table 2 Summary of the analytical conditions, total secondary ion counts, yields, and ion ratios of the 6 targets examined in PMo mode.

From: Ultrahigh-resolution imaging of biogenic phosphorus and molybdenum in palaeoproterozoic gunflint microfossils

        

Total counts

 

Yields (cps/pA)

 

Yields/area (cps/pA/area)

  

Counts on EM#4

Fco

Target #

Image

s/frm

Frames

Area(μm2)

Pixels

Active area (%)

12C−

12C14N−

31P−

98Mo16O−

 

12C−

12C14N−

31P−

98Mo16O−

 

12C−

12C14N−

31P−

98Mo16O−

31P−/12C−

98Mo16O−/12C−

Total

Yield

1.5

1

Fig. 2a

30

800

15 × 15

256 × 256

17

1.95E + 07

2.94E + 07

1.25E + 04

2.53E + 03

 

5.43E + 02

8.16E + 02

3.46E-01

7.02E-02

 

3.24E + 03

4.86E + 03

2.06E + 00

4.19E-01

6.37E-04

1.29E-04

22

6.11E-04

 

2

Fig. 2b

30

700

15 × 15

256 × 256

32

5.57E + 07

9.46E + 07

1.22E + 04

1.79E + 03

 

1.77E + 03

3.00E + 03

3.86E-01

5.67E-02

 

5.60E + 03

9.51E + 03

1.22E + 00

1.80E-01

2.18E-04

3.21E-05

–

–

 

3

Fig. 2c

30

800

13 × 18

190 × 256

37

5.08E + 07

7.12E + 07

1.30E + 04

2.50E + 03

 

1.41E + 03

1.98E + 03

3.61E-01

6.94E-02

 

3.86E + 03

5.41E + 03

9.87E-01

1.90E-01

2.56E-04

4.92E-05

33

9.17E-04

 

4

Fig. 2d

30

600

20 × 9.4

256 × 120

12

1.37E + 07

2.94E + 07

7.82E + 03

1.54E + 03

 

5.07E + 02

1.09E + 03

2.90E-01

5.72E-02

 

4.07E + 03

8.74E + 03

2.33E + 00

4.59E-01

5.71E-04

1.13E-04

45

1.67E-03

 

5

Fig. 2e

30

800

20 × 20

256 × 256

42

6.41E + 07

1.46E + 08

1.13E + 04

3.28E + 03

 

1.78E + 03

4.06E + 03

3.15E-01

9.12E-02

 

4.29E + 03

9.78E + 03

7.59E-01

2.19E-01

1.77E-04

5.12E-05

29

8.06E-04

 

6

Fig. 2f

30

600

14 × 20

180 × 256

18

1.89E + 07

4.21E + 07

5.25E + 03

1.10E + 03

 

6.99E + 02

1.56E + 03

1.94E-01

4.08E-02

 

3.88E + 03

8.66E + 03

1.08E + 00

2.26E-01

2.78E-04

5.84E-05

31

1.15E-03

            

Average

1.12E + 03

2.08E + 03

3.15E-01

6.43E-02

 

4.15E + 03

7.83E + 03

1.41E + 00

2.82E-01

3.56E-04

7.22E-05

32

1.03E-03

                 

Background

1.00E + 00

2.47E + 01

5.42E-02

2.56E-03

    
  1. The total counts of each secondary ion was increased after the background signal around the microfossils was removed via a carbon image-based threshold. Counts on a blank detector (EM#4) were also monitored to observed possible noise during measurement.
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