Molecular Beam Mass Spectrometry for Analysis of ... - EVUR
Molecular Beam Mass Spectrometry for Analysis of ... - EVUR
Molecular Beam Mass Spectrometry for Analysis of ... - EVUR
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Background<br />
MBMS analysis technique developed and<br />
used by NREL <strong>for</strong> >30 years (originally to<br />
study prompt thermochemical phenomena):<br />
1. Line-<strong>of</strong>-sight extraction <strong>of</strong> vapor-phase sample from<br />
high T, ambient P environment into mass<br />
spectrometer (P source/P Stage1 ≥ 10 4 )<br />
2. Supersonic expansion,<br />
rapid cooling/rarefaction<br />
preserves sample<br />
without condensation or<br />
reaction<br />
3. <strong>Mass</strong> analysis provides<br />
instantaneous chemical<br />
fingerprint <strong>of</strong> sample<br />
4. Useful <strong>for</strong> tar and alkali<br />
metal vapor analysis<br />
NATIONAL RENEWABLE ENERGY LABORATORY<br />
0.30 mm<br />
orifice<br />
Stage 1 Stage 2 Stage 3<br />
10<br />
1.0 mm<br />
skimmer<br />
-5 Torr 10-7 10 Torr<br />
-3 Torr<br />
440 L/s 520 L/s 260 L/s<br />
Formation <strong>of</strong> molecular beam<br />
2
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