The unidentified infrared emission (UIR or UIE) bands are infrared discrete emissions from circumstellar regions, interstellar media, star-forming regions and extragalactic objects for which the identity of the emitting materials is unknown.

2014年12月9日 · The table below shows how the various bends and stretches in atomic bonds in the PAH molecule produce the UIR bands, according to the experts. The strongest bands are in bold.

1998年1月1日 · The so-called Unidentified Infrared or simply UIR bands, the infrared emission band spectrum associated with a wide variety of interstellar objects, can be modeled in detail by laboratory spectra of neutral and positively charged …

2024年10月24日 · The infrared spectra of many dust-rich astronomical objects are dominated by a set of emission bands, historically known as the unidentified infrared (UIR) bands (1). Despite the name, the carriers of the UIR bands are widely accepted to be polycyclic aromatic hydrocarbons (PAHs), a class of organic molecules (2, 3).

2022年2月2日 · A family of unidentified infrared emission (UIE) bands has been observed throughout the Universe. The current observed spectral properties of the UIE bands are summarized. These properties are discussed in the frameworks of different models of the chemical carriers of these bands.

Unidentified infrared emission bands (UIR bands) have been attributed to polycyclic aromatic hydrocarbons (PAHs), which are believed to require ultraviolet radiation in order for the UIR bands to be excited.

2017年2月22日 · We analyze the spectrum of the 11.2 μm unidentified infrared band (UIR) from NGC 7027 and identify a small fullerene (C 24) as a plausible carrier. The blurring effects of lifetime and vibrational anharmonicity broadening obscure the narrower, intrinsic spectral profiles of the UIR band carriers.

2025年2月13日 · Formed during 2015 in Edinburgh as a collaboration of Scottish and Cumbrian musicians. Includes members of Haar and Úlfarr.

1998年12月18日 · Abstract: The spectrum of the unidentified infrared (UIR) emission bands between 5.9 and 11.7 [micro]m has been observed for the first time in the disk of an external galaxy. We have used the low-resolution spectrometer of the ISOPHOT instrument aboard ISO.

Spectroscopic observations by cooled telescopes in space have unambiguously demonstrated the presence of the UIR bands in the diffuse emission, indicating that the carriers of these bands are a ubiquitous and important component in the interstellar medium.