Transport efficiency in femtosecond laser ablation inductively coupled plasma mass spectrometry applying ablation cells with short and long washout times

摘要

Relative mass transport efficiencies of near infrared (lambda=795 nm) femtosecond laser generated brass aerosols in helium were measured by ICP-MS applying different ablation cells with short and long washout times.It was found that the transport efficiencies are independent of the cell used within the mutual experimental uncertainties.This finding was confirmed by additional measurements providing the absolute particle mass transport efficiencies of femtosecond laser ablation in He.Here,the transport efficiencies were determined by weighing the samples before and after ablation with a micro-balance,collecting the particles by low-pressure impaction,and evaluating the impacted masses quantitatively by total reflection X-ray fluorescence.Within the experimental uncertainties (+-9-19%) the same absolute transport efficiency (about 77%) was found for all cells applied.This efficiency value can be regarded as a lower limit of the absolute mass transport efficiency since mass losses in the impactor are difficult to quantify.