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Boundary between the regions of drift and runaway of electrons outside the townsend discharge domain boundary

“…If a certain value of (E/N)* is exceeded, its increase changes to the drop, which is due to a decrease in ionization cross sections of atoms and molecules with increasing elec tron energy (in the high energy region) [1][2][3][4][5][6]. Accordingly, the Townsend discharge domain is bounded by two branches.…”

“…Accordingly, the Townsend discharge domain is bounded by two branches. The domain under the lower branch corresponds to the electron drift region, while the domain above the upper branch corresponds to electron runaway region [1][2][3][4][5][6].…”

“…The problem of generating powerful subnanosec ond electron beams in atmospheric pressure gases [1][2][3][4][5] stimulates analysis and development of various problems of the gas discharge. In recent years, the study of generation of runaway electron beams and X rays in atmospheric pressure air and other gases has been given considerable attention (see, for example, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and literature cited therein).…”