Summary
We describe in this paper a simple interferometric technique which allows a direct and simultaneous determination of energy absorption and of the vibrational-translational relaxation time of polyatomic molecules strongly excited by reasonant, infrared (10.6 μm) laser radiation. In particular, we have applied this method to the study of freon-22 (CF2HCl), a medium-size molecule that, apart from its potential application in 13C isotope separation, shows interesting absorption features in the 10 μm region. The results are also compared with our previous findings in SF6.
Riassunto
Si describe in questo lavoro una semplice tecnica interferometrica che permette di misurare contemporaneamente sia l’assorbimento che il tempo di rilassamento vibrazionale-traslazionale di molecole poliatomiche sottoposte ad intensa eccitazione risonante attraverso un laser nell’infrarosso (10.6 μm). In particolare, abbiamo applicato tale tecnica allo studio del freon-22 (CF2HCl), una molecola poliatomica di dimensioni intermedia che, a parte la sua possibile, applicazione nella separazione isotopica del 13C, presenta interessanti caratteristiche nell’assorbimento nella regione attorno ai 10 μm. I risultati ottenuti sono discussi e comparati con quelli precedentemente ottenuti sullo SF6.
Резюме
В зтой статье описывается простая интерферометрическая техника, которая допускает прямые и одновременные измерения потлощения знергии и времени колебателыно-трансляционной релаксксации для полиатомных молекул, сильно возбужденных резонансным инфракрасным (10.6 мкм) пазерным излучением. В частхости, мы применяем зтот метод исследования фреона −22 (CF2HCl), молекулы средних размеров, которая обнаруживает интецные особенности поглоэения в области 10 мкм. Полученные результаты сравниваются с ранее полученными данными для SF6.
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Bruzzese, R., de Lisio, C., Labuda, S. et al. Simultaneous measurements of absorption and vibrational relaxation time in CF2HCl molecules. Nouv Cim D 11, 1693–1707 (1989). https://doi.org/10.1007/BF02459116
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DOI: https://doi.org/10.1007/BF02459116