Design and construction of a simple Knudsen Effusion Mass Spectrometer (KEMS) system for vapour pressure measurements of low volatility organics

被引：47

作者：

Booth, A. M. ^{[1
]}

Markus, T. ^{[2
]}

McFiggans, G. ^{[1
]}

Percival, C. J. ^{[1
]}

Mcgillen, M. R. ^{[1
]}

Topping, D. O. ^{[1
]}

机构：

[1] Univ Manchester, Sch Earth Environm & Atmospher Sci, Manchester M13 9PL, Lancs, England

[2] Res Ctr Julich, D-52425 Julich, Germany

来源：

ATMOSPHERIC MEASUREMENT TECHNIQUES | 2009年 / 2卷 / 02期

关键词：

DICARBOXYLIC-ACIDS; EVAPORATION RATES; RESONANCE SPECTROSCOPY; SUCCINIC ACID; AEROSOL; SUBLIMATION; ENTHALPIES; OXIDATION; ENERGIES;

D O I：

10.5194/amt-2-355-2009

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

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-(298K) and Delta H-sub of the first 5 saturated straight chain dicarboxylic acids: 2.15 +/- 1.19x10(-2) Pa and 75 +/- 19 KJ mol(-1) respectively for oxalic acid, 5.73 +/- 1.14x10(-4) Pa and 91 +/- 4 KJ mol(-1) for Malonic acid, 1.13 +/- 0.47x10(-4) Pa and 93 +/- 6 KJ mol(-1) for Succinic acid, 4.21 +/- 1.66x10(-4) Pa and 123 +/- 22 KJ mol(-1) for Glutaric acid and 6.09 +/- 3.85x10(-6) Pa and 125 +/- 40 KJ mol(-1) for Adipic acid.

引用

页码：355 / 361

页数：7

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