Table 1.
Summary of instrumental parameters used for the LA-ICP-MS imaging experiments
| Laser ablation | ICP-MS | ||
|---|---|---|---|
| Wavelength | 213 nm | Plasma power | 1550 W |
| Pulse duration | 4 ns | Cool gas flow | 14.0 L min−1 |
| Laser repetition rate | 20 Hz | Auxiliary flow | 0.8 L min−1 |
| Laser beam diameter | 40 μm | Cones | Ni |
| Laser energy | 3.19 mJ | Scanning mode | Peak hopping |
| Laser scan speed | 120 μm s−1 | Dwell time per isotope | 10 ms |
| Laser beam geometry | Circular | Monitored isotopes | 13C, 23Na, 24Mg, 25Mg, 39K, 42Ca, 44Ca, 55Mn, 56Fe, 57Fe, 58Ni, 60Ni, 63Cu, 64Zn, 65Cu, 66Zn, 197Au |
| He gas flow | 1.0 L min−1 | Mass resolution at m/z 238 | 300 m/Δm |
| Ar make-up flow | 0.8 L min−1 | ||