in-situ O isotope for low-Ca Px@782 < 20110524102434-601-562 > pub
  • technique: SIMS
  • device: SIMS Cameca ims-1270
  • operator: tk
  • description: primary impact energy 20 keV gold coat (50+)200 × 3 °A secondary accelerating voltage −10 kV primary beam current 200 pA (4H × 3V μm) primary beam raster 5 × 5 μm (7 × 7 μm for first 140 s) entrance slit width 80 μm field aperture dimension 800 × 800 μm (20 × 20 μm on sample) energy band pass from −10 to +30 (40 eV width) exit slit width 200 μm for 17O− and 400 μm for 16O− and 18O− mass resolution (m/m) 8,000 for 17O− and 2,400 for 16O− and 18O− detectors FC (L’2), EM (axial), and EM (H1) for 16O−, 17O−, and 18O− peam optimization automatic FA centering at beginning (30 s) mass calibration automatic mass centering at beginning (15 s) pre-sputter duration 3 min 10 s including beam optimization and mass calibration secondary ion integration 14.5 s × 40 cycles contribution of 16OH− to 17O− less than 0.1h background estimation every 1 hour
  • modified at 2016-03-02
  • stone: en-px-E002-b
measured value uncertainty unit description
δ(18O/16O) 2.9 0.5
δ(17O/16O) 2.6 0.5
Δ(17O/16O) 1.1 0.5
name global-id
name spots global-id