Analysis of the Causes of the Inverse Population of Atomic Argon Levels in Condensing Supersonic Flows of Mixtures

The features of argon radiation mixed with molecular and atomic additives in condensing supersonic jets are analyzed. Mixtures of argon (95%) with methane (5%) and argon (95%) with monosilane (5%) were used. The mixture particles were activated by a well-focused electron beam. The dependence of the radiation intensity of individual argon lines on the gas-dynamic parameters in the jet is investigated. In a certain pressure range, different for various compositions of mixtures, an abnormal increase in the intensity of radiation on individual lines of atomic argon (ArI) was recorded. At the same time, no similar effect has been detected in the spectrum of argon (ArII) ions. It is established that the cause of the anomaly is a highly efficient molecular cluster mechanism of selective excitation of individual levels of argon atoms, which is absent in non-condensing jets and weakens at the stage of formation of large clusters. The main channels of energy transmission are considered and discussed. Based on the data obtained, an empirical model of the excitation - radiation process is proposed

supersonic jet, mixed clusters, electronic excitation of radiation, molecular beam mass spectrometry, molecular cluster energy exchange

Volume 23, issue 3, 2022 year

Анализ причин инверсной заселенности уровней атомарного аргона в конденсирующихся сверхзвуковых потоках смесей

Выполнен анализ особенностей излучения аргона в смеси с молекулярными и ато-марными добавками в конденсирующихся сверхзвуковых струях. Использованы смеси аргона (95%) с метаном (5%) и аргона (95%) с моносиланом (5%). Частицы смеси активировались хорошо сфокусированным пучком электронов. Исследована зависимость интенсивности излучения отдельных линий аргона от газодинамиче-ских параметров в струе. В определенном диапазоне давлений, различном для раз-ных составов смесей, зафиксировано аномальное увеличение интенсивности излу-чения на отдельных линиях атомарного аргона (ArI). В то же время в спектре ионов аргона (ArII)подобный эффект не обнаружен. Установлено, что причиной аномалии является высокоэффективный молекулярно-кластерный механизм селективного возбуждения отдельных уровней атомов аргона, отсутствующий в неконденсиру-ющихся струях и ослабевающий на стадии образования крупных кластеров. Рас-смотрены и обсуждены основные каналы передачи энергии. На основе полученных данных предложена эмпирическая модель процесса возбуждения - излучения.

сверхзвуковая струя, смешанные кластеры, электронное возбуждение излучения, молекулярно-пучковая масс-спектрометрия, молекулярно-кластерный энергооб-мен

Volume 23, issue 3, 2022 year

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