Summary
We have investigated sub-Doppler lineshapes of neon transitions by means of intermodulated optogalvanic technique in a direct current hollow cathode and a radio frequency glow discharge. The intermodulated Doppler-free signal, as usual, is superimposed on a broad Gaussian background due to velocity-changing collisions. The ratio between the collisional and the homogeneous signal has been systematically investigated as a function of gas pressure and discharge current. By detecting neon as a trace in other buffer gases, the lineshapes have been also carefully investigated as a function of the mass of the perturbers (helium and argon). Comparison between theoretical predictions and experimental data leads to quantitative evaluations of collisional parameters.
Riassunto
Sono state investigate le forme di riga di transizioni del neon mediante la spettroscopia optogalvanica in intermodulazione. Il segnale intermodulato, privo di allargamento Doppler, è dat da una Lorenziana, corrispondente all'allargamento omogeneo della transizione, sovrapposta ad un fondo Gaussiano dovuto alle collisioni che producono un cambiamento della velocità degli atomi lungo la direzione dei due fasci laser contropropaganti. È stato compiuto uno studio sistematico del contrasto tra il fondo Doppler e l'ampiezza omogenea della riga al variare della pressione del gas e della corrente di scarica. Inoltre, rivelando il neon come traccia in altri gas nobili (argon, elio), si è investigato l'effetto della massa dell'atomo perturbatore nei processi collisionali. I dati sperimentali sono stati confrontati con i modelli teorici esistenti deducendone stime dei parametri collisionali.
Резюме
Мы исследуем суб-доплеровские формы линий для переходов неона. Вэаимно модулнрованный сигнал, как обычно, накладывается на шнрокнй гауссов фон, обысловленный соударениями с изменением скоростей Систематически исследуется зависимостй отношения между столкновителйным и однородным сигналами от давленя газа и тока разряда. С целйю детектирования неона, как следа в другнш вуферныш газаш, мы также нзучаем зависимость форм линий от массы других инертиых газов (гелий и аргон). Сравнение теоретических предсказаний и эксперименталйных данных позволяет получнтй количественныэ оценкн параметров соударений.
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Sasso, A., Tino, G.M., Inguscio, M. et al. Investigation of collisional lineshapes of neon transitions in noble gases' mixtures. Il Nuovo Cimento D 10, 941–957 (1988). https://doi.org/10.1007/BF02450196
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DOI: https://doi.org/10.1007/BF02450196