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Rydberg Matter (RM) theory is previously shown to give good agreement withthe unidentified infrared bands (UIR, UIB) that are observed in emission frommany objects in space. From stimulated emission studies in RM, a slightlysimpler theoretical model is found that describes the transitions giving theUIR bands better. The general theory for RM was recently shown to be veryaccurate using rotational spectroscopy to observe several types of RM clusters(Mol. Phys. 105 (2007) 933). Two different large studies of UIR are nowinterpreted with the improved model. High-resolution UIR observations byBeintema et al. are interpreted as transitions from high levels n = 40 - 80down to levels n = 5 - 12 in the final state. The upper level quantum numbersfor the observed bands agree well with those found in experiments. Thestationary UIR bands at 3.3 and 11.3 micrometer are due to deexcitation n = 9-> 5 and 9 -> 7 of Rydberg species through stimulated emission. The other UIRbands vary considerably in wavelength in different environments and even withtime as seen in numerous observational studies. Their great variability isdifficult to model by the commonly used PAH model, but is a natural consequenceof the varying excitation state of RM.

Electronic transitions in Rydberg Matter as the source of the unidentified infrared bands (UIR) observed in interstellar space