Mass-spectrometric investigation of coal gases from samples with a low and high degree of coalification

The methods and results of experimental investigation into the composition of gases by mass spectrometry with electron impact ionization are described. Experiments are performed on a crossed-beams setup with ion separation and detection using a monopole mass spectrometer with an upgraded ion source. Emphasis is on determination of the molecular composition of gases, including methane, liberating from the coal material as a function of temperature.