Pink Afterglow in Nitrogen-Argon Mixtures

lecture

English

The effect of nitrogen pink afterglow was studied in the DC flowing regime at total gas pressure of 700 Pa and discharge current of 120 mA. The maximum of pink afterglow emission in pure nitrogen was observed at decay time of 6 ms and it was moved to the later decay times with the increasing argon percentage in the gas mixture. Simultaneously the intensity of pink afterglow decreased and at the nitrogen-argon ratio of about 1:1 the effect disappeared. At the highest argon concentrations over 90 %, the visible light emission during the post-discharge was negligible. The other observed effect was the extension of the active discharge downstream the discharge tube with the increase of the argon presence in the gas mixture over about 50 %. The kinetic model showed that the pink afterglow quenching was connected to the decrease of the v-v and pooling processes efficiency, the extension of the active discharge was done by energy transfer between argon metastables and nitrogen ground state molecules.

pink afterglow, post-discharge kinetics, nitrogen-argon mixture

KRČMA, F.; VALENTOVÁ, M.

10. 9. 2007

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