BEHAVIOR OF NEON 1s(5) ATOMS IN He-Ne ACTIVE D. C. DISCHARGES.
ILLINOIS UNIV URBANA GASEOUS ELECTRONICS LAB
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The radial profiles of the neon 1s5 metastable atom density in active d.c. He-Ne discharges were measured by means of a laser interferometer operating at 6401 A. The axial metastable densities were observed to increase with current to a maximum value at a current Isat and then decrease with further increases in current. For currents much greater than the saturating value, Isat, the profiles were observed to be uniform, while for the opposite extreme the spatial distributions were zero order Bessel functions. For the 5.5 mm bore tube examined the first noticeable transition from a Bessel function to a uniform profile corresponds to this same saturation current satisfying the condition p Isat is about 45-50 torr. ma. Electron-metastable ionizing collisions are shown to be the destructive process that causes the spatial uniformity, whereas the decrease in the axial metastable density is due to the shift of the average electron energy to lower values with increasing current. Author
- Lasers and Masers
- Plasma Physics and Magnetohydrodynamics