However , in mid-1980 it was realized that time - of - flight mass spectrometers is more efficient for this mode of SIMS .
Initially , most SSIMS was performed using Quadrupole mass analyzer .
In mid-1980 SSIMS was realized that time - of - flight mass spectrometers is more efficient for this mode of SSIMS .
Initially , most SSIMS was performed using Quadrupole mass analyzer .