Various theoretical approaches based on capture collision theory have been developed to compute the rate coefficients of ion-molecule reactions in the gas phase. These theoretical methods require the electric dipole moment and polarizability of the neutral molecule as input parameters Read more…

These computed molecular parameters, including dipole moment, polarizability, proton affinity, and ionization energy of volatile organic compounds (VOCs), are crucial for the identification and quantification of VOCs in chemical ionization mass spectrometry. These parameters are determined using Density Functional Theory Read more…

SIFT-MS Analytic Method These Direct Injection Mass Spectrometry (DIMS) techniques rely on calibrating instruments using standards with known concentrations and protonated ion signals. Although the most accurate analysis requires calibrating the instrument for each volatile organic compound (VOC) in a Read more…

Soft chemical ionization is a powerful analytical technique employed in Selected Ion Flow Tube Mass Spectrometry (SIFT-MS) for the precise detection and quantification of trace gases, particularly volatile organic compounds (VOCs), present in ambient air samples. This method hinges on Read more…

Volatile organic compounds (VOCs) are found in many food and flavor products, and their presence can affect the flavor, aroma, and quality of the product. VOCs are used to analyze food and flavor products to determine their quality, as well Read more…

Introduction Chemical ionisation mass spectrometry (CI-MS) is a powerful analytical technique used to identify and quantify the composition of chemical compounds. In CI-MS, ion-molecule reactions play a crucial role in the formation of ions that are subsequently detected and analyzed. Read more…