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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