Abstract
The displacements of 30 peaks of eight chemicals over a wide range of temperatures, from 30 to 250 °C, with 20 °C increments, were studied. Experimental results show that the separations remain fairly constant and ion mobility spectra can be corrected by shifting all drift times by Δ<i>t</i><sub>d</sub> = (Δ<i>T</i>/<i>T</i>)[<i>a</i> + <i>b</i>(Δ<i>T</i>/<i>T</i>)] where <i>T</i> is the absolute temperature and <i>a</i> and <i>b</i> are constants which depend on pressure and the instrumental parameters. Also, by using the reactant ion peak as an internal standard, a factor of <i>k</i> = (<i>t</i> - <i>t<sub>R</sub></i>)/<i>t<sub>R</sub></i>, has been defined, where <i>t</i> is the drift time, <i>t<sub>R</sub></i> is the reactant ion drift time, and <i>k</i> is called the adjusted drift time. This factor is independent of instrumental parameters and increases linearly with temperature as: <i>k</i> = α(<i>T</i><sup>1/2</sup> - 11.88). It can be normalized to a standard temperature of 298 K to give <i>k</i><sub>298</sub> = 5.3827 <i>k<sub>T</sub></i>/(<i>T</i><sup>1/2</sup> - 11.88). The <i>k</i><sub>298</sub> values were determined for the 30 peaks over a temperature range of 30-250 °C. These values show less sensitivity to temperature than their corresponding reduced mobilities. By transforming the entire drift time to the reduced adjusted drift time, <i>k</i><sub>298</sub>, the peak shifts were corrected for all spectra recorded at temperatures (30-250 °C) such that the spectra superimposed.
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