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Astron. Astrophys. 358, 276-286 (2000)

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6. Conclusions

It is shown that good agreement with spectra of the so called unidentified infrared emission (UIR) bands is found for the calculated emission due to electronic deexcitation from Rydberg Matter. The electronically excited Rydberg Matter can incorporate any atom or small molecule, and it is formed at carbon or other particle surfaces at low pressure under the influence of moderate heat and photon fluxes. All the observed peaks fall within bands corresponding to transitions from RM states between principal quantum number n = 40 and 200. The transitions go down to a relatively low level with n = 12-22 in a core ion in the Rydberg matter, i.e. the transition involves also the next highest electron in an atom or a molecule as for example H2 or Na. Also transitions where the core ions capture diffusing electrons exist. The agreement with the examples of type A and B spectra used by Allamandola et al. (1999) is improved in the RM model compared to the PAH model used by these authors. Other recent observational evidence also provides support for the RM model.

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© European Southern Observatory (ESO) 2000

Online publication: June 26, 2000