A Planar Integrated Micro-mass Spectrometer - LC-MS in Drug Bioanalysis - page 442

Fig. 17 This figure depicts the computed and measured throughput of the plasma chamber vs. the
inlet capillary pressure extrapolated to low fl ows

Fig. 18 Pressure drop diagram for the plasma chamber in operation mode. The inlet capillary
pressure is 2e4 Pa

Finally, the gas supply pressure p g is transformed to the desired inlet capillary
pressures p v listed in Table 1 , according to the Hagen-Poiseuille based equation :

2· pV q

2

p =− p

v g

K

C

with q pV as determined above (Fig. 17 ).