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High Precision Isotope Ratio Measurements using a ICP-Hexapole Magnetic Sector Instrument. Z. Palacz, P. Turner, S. Meffan-Main. Sampling cone (sampler). Flight tube LOS valve. Acceleration Lenses. Shock wave. Argon plasma. Skimmer cone. To magnetic mass spectrometer. ICP torch.

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high precision isotope ratio measurements using a icp hexapole magnetic sector instrument

High Precision Isotope Ratio Measurements using a ICP-Hexapole Magnetic Sector Instrument

Z. Palacz, P. Turner, S. Meffan-Main.

hexapole

Sampling cone

(sampler)

Flight tube

LOS valve

Acceleration

Lenses

Shock wave

Argon

plasma

Skimmer cone

To magnetic

mass spectrometer

ICP

torch

Hexapole collision

cell

Zone of

silence

Expansion

Volume Pump

Intermediate

Pump

Collision Chamber

Pump

Acceleration

Chamber Pump

Hexapole
effect of argon in hexapole on u intensity
Effect of Argon in hexapole on U intensity.

9

8

7

6

5

238U Intensity (volts)

4

3

2

optimal

1

0

0

0.5

1

1.5

2

Ar gas flow ml/min

slide5

U

Sr

Mg

Flat Top Peak shapes across the Mass Range

slide6

11

10

In

Pb

10

10

Nd

U

Rh

Hf

Cs

cps/ppm

Tb

Th

Sr

Os

Co

Mg

3-4 eV

9

10

5-6 eV

Ionization

Potential

6-7 eV

Fe

7-8 eV

Li

8-9 eV

8

10

200

0

50

100

150

250

Mass

Sensitivity of the IsoProbe

stability of mass bias over 1hr
Stability of Mass Bias Over 1hr

0.745

0.7449

146Nd/144Nd

0.7448

Mean 0.744872+/-25 1SD

Mass Bias is 1.59% per amu

0.7447

0

10

20

30

40

50

60

70

MINUTES

reproducibility of 143 nd 144 nd in la jolla
Reproducibility of 143Nd/144Nd in La Jolla

0.51188

0.51187

143Nd/144Nd

0.51186

0.511864+/-10ppm 1SD

150ppb La Jolla

CETAC MCN 6000

Each point 6minutes using 30ng Nd

144Nd intensity 2e8 cps ~6e9cps/ppm

0.51185

TIMS 0.511858

0.51184

0

2

4

6

8

10

12

Measurement

176 hf 177 hf in ames and jmc standards 15ng per analysis

0.28218

AMES

JMC 475

0.2821629+/-44

1SD

0.28217

0.28216

176Hf/177Hf

0.28215

0.2821495+/-35 1SD

0.28214

0

2

4

6

8

10

12

14

Analysis

176Hf/177Hf in Ames and JMC standards. 15ng per analysis.
conclusions
Hexapole collision cell reduces energy spread to <1ev.

Hexapole is stable and produces a stable mass bias which is largely independent of gas pressure.

Hexapole removes argides

Hexapole produces an increase in sensitivity.

~0.5% ion:atom efficiency for Hafnium.

IsoProbe can produce reproducibility's for Nd of ~10ppm.

Conclusions