The present invention relates to the analytical electronics used to identify compositions and structures of substances, in particular, to the analyzers comprising at least one mass-spectrometer (MS) and may be applied in such fields as medicine, biology, gas and oil industry, metallurgy, energy, geochemistry, hydrology, ecology.Technical result provides the increase in MS resolution, gain in sensitivity, precision and measurement rates of substances compositions and structures concurrently with enhancement of analyzer functional capabilities, downsizing and mass reduction.In claimed invention the ion flux generation and its guiding are performed in off-axis single-flow mode; parallel multi-stage mode; through use of three-dimensional field with mean meridian surface including without limitation three-dimensional reflecting and dual-zoned reflecting modes or by method of multi-reflection arrays.Devices to implement the claimed method are embodied.Proposed schematic ion optical diagrams allow developing different MS types notable for their minimized material intensity and geometrical dimensions.