Lineshape in a laval molecular beam and pressure broadening of N2O Transition lines

Year: 1993

Authors: Baldacchini G., Chakraborti P.K., D’Amato F.

Autors Affiliation: Bhabha Atom. Res. Ctr., MDRS, Bombay 400085,India; CRE Frascati,ENEA, dipartimento sviluppo tecnol. punta, area INN, CP 65,I-00044 Frascati, Italy

Abstract: We have measured the absorption profile of N2O transitions belonging to the nu2 vibrational band at 589 cm-1 in order to characterize the gas flow in a pulsed Laval molecular beam. It is found that the shape of the transition is almost Lorentzian near the nozzle exit while it clearly approaches a Gaussian profile far away from the nozzle throat. After measuring the spectral profiles for the same transition in a cell at different pressures, we were able to quantify the molecular density along the Laval stream. We have also measured the pressure-broadening parameters of few transitions of the nu2 band.


Volume: 49 (4)      Pages from: 439  to: 447

KeyWords: Laval molecular beam; Pressure broadening; N2O
DOI: 10.1016/0022-4073(93)90109-U

Citations: 1
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