Abstract
Disorientation and disalignment of neon excited atoms in the fine-structure 2p2 level (in Paschen notation) of the 2p53p configuration have been investigated in a helium–neon glow discharge at temperatures between 17 and 300 K. The determined rate coefficients for disorientation, Rdo, and disalignment, Rda, due to helium atom collisions show similar temperature dependences of T1.6 below 77 K with the ratio about Rdo:Rda = 2:1. This fact indicates that both the excitation transfer cross sections between the mJ = 1 and mJ = −1 states, σ1–1, and between the mJ = ±1 and mJ = 0 states, σ10, due to helium atom collisions have similar energy dependences of E1.1 with the ratio about σ1–1:σ10 = 2.5:1 below 10 meV.
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