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An opto-thermal study of NH3 rotational relaxation in NH3-He supersonic expansions

โœ Scribed by M. Scotoni; M. Zen; D. Bassi; A. Boschetti; M. Ebben

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
641 KB
Volume
155
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

We have investigated the rotational relaxation of NH3 in N&-He supersonic expansions by means of opto-thermal spectroscopy. Molecules are excited in the v,+ Y., band, around 5100 cm-', using the third Stokes line of a Raman-shifted pulsed laser. Rotational distributions are measured for different values of the source stagnation pressure and NH, concentration. At low rotational temperatures, populations deviate fmm a Boltxmann distribution. This is attributed to the reduction of para-to-ortho conversion during the expansion.

๐Ÿ“œ SIMILAR VOLUMES

A multiphoton ionization study of nh3 ro
A multiphoton ionization study of nh3 rotational relaxation in pulsed NH3-He supersonic expansions
โœ Bruce D. Kay; A.J. Grimley ๐Ÿ“‚ Article ๐Ÿ“… 1986 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 421 KB

## Two-photon resonant three-photon ionization is employed to study the rotational relaxation of NH, in a pulsed supersonic expansion. The different NH, nuclear spin modifications (ortho-para) do not interconvert and relax at different rates. Para relaxation is more efficient than ortho relaxation