کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1193909 | 1492280 | 2013 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Theoretical modeling of sensitivity factors of Bayard-Alpert ionization gauges Theoretical modeling of sensitivity factors of Bayard-Alpert ionization gauges](/preview/png/1193909.png)
• Theoretical and experimental aspects for the sensitivity factors (Sr) of Bayard-Alpert ionization gauges.
• QSPR modeling of the Sr and internal and external validation of the model.
• Applicability domain description and online model for external prediction of Sr.
Measuring the relative sensitivity factors (Sr) in Bayard-Alpert ion gauge is technically demanding and time-consuming. Moreover, the accuracy deterioration in the low pressure range (high vacuum) becomes problematic. Experimental Sr values are reported for 91 molecules of diverse molecular structures. A three-descriptor QSPR model based on experimental data is established. The model obtained, which explains more than 93% of the data variance, has a good statistical validity and stability. The three selected molecular descriptors, Kier & Hall index, charge difference on the molecular surface, and count of H donor sites appropriately describe the physicochemical background of the relative sensitivity factors. The model developed in this work is freely accessible through the web: http://www.ut.ee/qsar.
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Journal: International Journal of Mass Spectrometry - Volumes 341–342, 1 May 2013, Pages 52–58