Gas Mass Spectrometer GV-5400----Institute of Geochemistry Chinese Academy of Sciences

　　1. Resolution
　　　a. High Mass Faraday: 228.1
　　　b. Axial Collector (Multiplier): 682.3
　　　c. Axial Collector (Daly): 679.6
　　2. Background
　　　Mass 36 Argon: 6.519×10-15ccSTP
　　3. Sensitivity
　　　Helium: 3.9725×10-4A/Torr
　　　Argon: 1.1018×10-3A/Torr
　　4. Static vacuum level
　　　Rise of 40Ar signal: 1.613×10-14ccSTPmin-1
　　5. Abundance sensitivity
　　　 Tail contribution at 39Ar from 40Ar at 10-7/Torr: 0.136ppm
　　6. Peak side stability
　　　Drift is 60.87ppm in field at mass 40 over 30 minutes
　　7. Prep Bench
　　　Rise of 40Ar signal: 4.20×10-13ccSTPmin-1
　　8. Peak top flatness
　　　High collector: 40Ar peak to be flat to better than ±1 in 103 over 300 ppm in mass

　　Multiplier collector: 40Ar peak to be flat to better than ±1 in 103 over 150 ppm in massDaly collector: 40Ar peak to be flat to better than ±1 in 103 over 150 ppm in mass