An apparatus is described for detecting broad band far i.r. fluorescence in gases pumped by a variety of C02 laser lines. It consists of three major components: (i) an Apollo Instruments tunable CO2 laser, pumping (ii) a specially designed sample cell which collimates the emitted radiation for subsequent analysis in (iii) an N.P.L./Grubb-Parson ‘Cube Interferometer’, incorporating the Fellgett and Jaquinot advantages. As shown by Roodhardt and Wegdam [1] in HCl pumped via SF6, the induced far i.r. fluorescence is rotationally very ‘hot’, i.e. the distribution of the rotational absorption envelope peaks at an equivalent temperature of some thousands of Kelvin, and is no longer describable by Blotzmann statistics. We present experimental evidence for broad band, far i.r., CO2-induced fluorescence in the asymmetric top CH2CF2 for different CO2 laser lines. The results are discussed in terms of a model of the collisional dynamics involved in the transfer of vibrational to rotational energy.
A spectrometer for far i.r. hot broad band fluorescence in gases / G. J., Evans; C. J., Reid; Ferrario, Mauro; M. W., Evans. - In: SPECTROCHIMICA ACTA. PART A, MOLECULAR SPECTROSCOPY. - ISSN 0584-8539. - STAMPA. - 37:(1981), pp. 123-127. [10.1016/0584-8539(81)80098-0]
A spectrometer for far i.r. hot broad band fluorescence in gases
FERRARIO, Mauro;
1981
Abstract
An apparatus is described for detecting broad band far i.r. fluorescence in gases pumped by a variety of C02 laser lines. It consists of three major components: (i) an Apollo Instruments tunable CO2 laser, pumping (ii) a specially designed sample cell which collimates the emitted radiation for subsequent analysis in (iii) an N.P.L./Grubb-Parson ‘Cube Interferometer’, incorporating the Fellgett and Jaquinot advantages. As shown by Roodhardt and Wegdam [1] in HCl pumped via SF6, the induced far i.r. fluorescence is rotationally very ‘hot’, i.e. the distribution of the rotational absorption envelope peaks at an equivalent temperature of some thousands of Kelvin, and is no longer describable by Blotzmann statistics. We present experimental evidence for broad band, far i.r., CO2-induced fluorescence in the asymmetric top CH2CF2 for different CO2 laser lines. The results are discussed in terms of a model of the collisional dynamics involved in the transfer of vibrational to rotational energy.
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