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Design and construction of a simple Knudsen Effusion Mass Spectrometer (KEMS) system for vapour pressure measurements of low volatility organics
| Content Provider | Scilit |
|---|---|
| Author | Booth, A. M. Markus, T. McFiggans, G. Percival, C. J. Mcgillen, M. R. Topping, D. O. |
| Copyright Year | 2009 |
| Description | A design of and initial results from a Knudsen Effusion Mass Spectrometer (KEMS) are presented. The design was adapted from high temperature alloy studies with a view to using it to measure vapour pressures for low volatility organics. The system uses a temperature controlled cell with an effusive orifice. This produces a molecular beam which is sampled by a quadropole mass spectrometer with electron impact ionization calibrated to a known vapour pressure. We have determined P(298 K) and ΔHsub of the first 5 saturated straight chain dicarboxylic acids: 2.15±1.19×10-2 Pa and 75±19 KJ mol−1 respectively for oxalic acid, 5.73±1.14×10-4 Pa and 91±4 KJ mol−1 for Malonic acid, 1.13±0.47×10-4 Pa and 93±6 KJ mol−1 for Succinic acid, 4.21±1.66×10-4 Pa and 123±22 KJ mol−1 for Glutaric acid and 6.09±3.85×10-6 Pa and 125±40 KJ mol−1 for Adipic acid. |
| Ending Page | 361 |
| Page Count | 7 |
| Starting Page | 355 |
| e-ISSN | 16807324 |
| DOI | 10.5194/amt-2-355-2009 |
| Alternate Webpage(s) | https://www.atmos-meas-tech.net/2/355/2009/amt-2-355-2009.pdf |
| Journal | Atmospheric Chemistry and Physics |
| Issue Number | 2 |
| Volume Number | 2 |
| Language | English |
| Publisher | Copernicus GmbH |
| Publisher Date | 2009-07-24 |
| Access Restriction | Open |
| Subject Keyword | Kj Mol Mass Spectrometer Vapour Pressure |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atmospheric Science |
