Line-width and -shape of absorption lines of the vz vibration of ammonia were measured for a series of transitions starting from vibrational groundstate levels with a different rotational energy. An increase in linewidth was found for larger rotational energies of the initial states. This effect has been attributed to the spatial rotational non-equilibrium in the supersonic jet expansion. For expansions of NH3 seeded in He and Ar a very pronounced dip in the absorption profile has been observed, due to the formation of clusters.
Shape and Width of IR Absorption Lines of Ammonia Expanded in a Supersonic Jet
M Snels;
1988
Abstract
Line-width and -shape of absorption lines of the vz vibration of ammonia were measured for a series of transitions starting from vibrational groundstate levels with a different rotational energy. An increase in linewidth was found for larger rotational energies of the initial states. This effect has been attributed to the spatial rotational non-equilibrium in the supersonic jet expansion. For expansions of NH3 seeded in He and Ar a very pronounced dip in the absorption profile has been observed, due to the formation of clusters.File in questo prodotto:
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