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We present here a novel experimental set-up that is able to measure the enthalpy ofsublimation of a given compound by means of piezoelectric crystalmicrobalances (PCMs). The PCM sensors have already been used for spacemeasurements, such as for the detection of organic and non-organic volatile speciesand refractory materials in planetary environments. In Earth atmospherics applications, PCMs can be also used to obtain somephysical–chemical processes concerning the volatile organic compounds (VOCs)present in atmospheric environments. The experimental set-up has been developedand tested on dicarboxylic acids. In this work, a temperature-controlledeffusion cell was used to sublimate VOC, creating a molecular flux that wascollimated onto a cold PCM. The VOC recondensed onto the PCM quartz crystal,allowing the determination of the deposition rate. From the measurements ofdeposition rates, it has been possible to infer the enthalpy of sublimationof adipic acid, i.e. ΔHsub : 141.6 ± 0.8 kJ mol−1,succinic acid, i.e. 113.3 ± 1.3 kJ mol−1, oxalic acid, i.e.62.5 ± 3.1 kJ mol−1, and azelaic acid, i.e. 124.2 ± 1.2 kJ mol−1. The results obtained show an accuracy of 1 % for succinic,adipic, and azelaic acid and within 5 % for oxalic acid and are in very goodagreement with previous works (within 6 % for adipic, succinic, andoxalic acid and within 11 % or larger for azelaic acid)

atmospheric measurement techniques

Piezoelectric crystal microbalance measurements of enthalpy of sublimation of C&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;–C&amp;lt;sub&amp;gt;9&amp;lt;/sub&amp;gt; dicarboxylic acids