Skip to main content

Table 1 (LA)-MC-ICPMS instrument operating parameters

From: Mass fractionation of Rb and Sr isotopes during laser ablation-multicollector-ICPMS: in situ observation and correction

MC-ICPMS

Nu plasma II

Neptune

Faraday detector

9 Faraday cups

7 Faraday cups

H7 (88) H6 (87) H5 (86.5) H4 (86) H3 (85.5) H2 (85) Ax (84) L1 (83.5) L2 (83)

H2 (88) H1 (87) C (86) L1 (85) L2 (84) L3 (83) L4 (82)

RF power

1300 W

1200 W

Reflected power

<  1 W

< 2 W

Auxiliary gas flow rate (Ar)

0.9 L/min

0.9 L/min

Sweep gas flow rate (Ar)

4~5 L/min

-

Integration time

0.2 s

4.2 s

Sampler & Skimmer cone

Nickel

 

Session 1

Session 2

Session 3

Session 4

Session 5

 

ThO+/Th+ (248/232)

0.77%

0.21%

0.16%

0.34%

0.68%

-

Laser (ESI machines NWR 193-nm ArF excimer laser)

 

Spot size

150 μm

100 μm

150 μm

150 μm

150 μm

 

88 peak intensity (NIST SRM 610)

4.5 V

1.0 V

1.7 V

1.7 V

5.0 V

 

Ablation mode

Single hole drilling

 

Cell

Two volume 2 cell (10 × 10 cm)

 

Pulse energy density

8 J/cm2

 

Pulse repetition rate

20 Hz

 

Ablation duration

30 s

 

Carrier gas flow rate (He)

0.65 L/min

Â