Tunable diode laser absorption spectroscopy is used for recording the spectrally mixed profiles of argon 772.376 nm (2p₇-1s₅) and 772.421 nm (2p₂-1s₃) lines at different argon background pressures between 0.3 and 1 atmosphere. The absorbing atoms in the Ar*(1s₅) and Ar*(1s₃) metastable states are produced in a plane-to-plane dielectric barrier glow discharge operating at 20 kHz. The pressure broadening coefficient w and wavelength shift, s of the lines, deduced from the analysis of their variation versus pressure of recorded profiles, are w₁=28.3±2.0 pm (14.2±1.0 GHz) and s₁=11.5±0.8 pm (-5.8±0.4 GHz) for 772.376 nm line and w₂=36.3±0.5 pm (18.2±0.3 GHz) and s₂=12.8±0.7 pm (-6.4±0.4 GHz) for 772.4207 nm line, at 1 bar and 300 K. The progressive enhancement with argon pressure of the peak densities ratio [Ar*(1s₃)]/[Ar*(1s₅)], reaching 0.3 at 1 bar, reveals the importance of Ar-induced collisions for the population transfer from resonant 1s₂ to the metastable 1s₃ state. Also, the time variation of Ar*(1s) densities indicates the presence of a weak excitation channel outside the discharge current pulse initiated by the breakdown. This channel results from the heating of electrons by the electric field seen by the gas in the DBD gap.

可调谐二极管激光吸收光谱用于记录氩气 772.376 nm (2p ₇ -1s ₅ ) 和 772.421 nm (2p ₂ -1s ₃ ) 谱线在 0.3 和 1 个大气压之间的不同氩气背景压力下的光谱混合分布。_{Ar*(1s 5} ) 和 Ar*(1s ₃ ) 亚稳态中的吸收原子是在工作频率为 20 kHz 的平面到平面介质阻挡辉光放电中产生的。线的压力展宽系数w和波长偏移s是通过分析它们对记录剖面的压力变化而得出的，分别为 w ₁ =28.3±2.0 pm (14.2±1.0 GHz) 和 s ₁=11.5±0.8 pm (-5.8±0.4 GHz) 对于 772.376 nm 线和 w ₂ =36.3±0.5 pm (18.2±0.3 GHz) 和 s ₂ =12.8±0.7 pm (-6.4±0.4 GHz) 对于 772.4207 nm 线，在 1 bar 和 300 K 下。峰密度比 [Ar*(1s ₃ )]/[Ar*(1s ₅ )]随着氩气压力逐渐增强，在 1 bar 时达到 0.3，揭示了 Ar 引起的碰撞的重要性用于从共振 1s ₂到亚稳态 1s ₃状态的种群转移。此外，Ar*(1s) 密度的时间变化表明在由击穿引发的放电电流脉冲之外存在弱激发通道。该通道是由 DBD 间隙中的气体所看到的电场加热电子产生的。