Silicon Nanoparticles: Source of Extended Red Emission?

1998 ◽  
Vol 501 (1) ◽  
pp. L111-L115 ◽  
Author(s):  
Adolf N. Witt ◽  
Karl D. Gordon ◽  
Douglas G. Furton
Keyword(s):  
Silicon Nanoparticles ◽  
Red Emission ◽  
Extended Red Emission

scholarly journals Crystalline silicon nanoparticles as carriers for the Extended Red Emission

2001 ◽  
Vol 377 (2) ◽  
pp. 707-720 ◽  
Author(s):  
G. Ledoux ◽  
O. Guillois ◽  
F. Huisken ◽  
B. Kohn ◽  
D. Porterat ◽  
...  
Keyword(s):  
Silicon Nanoparticles ◽  
Crystalline Silicon ◽  
Red Emission ◽  
Extended Red Emission

scholarly journals Aqueous red-emitting silicon nanoparticles for cellular imaging: Consequences of protecting against surface passivation by hydroxide and water for stable red emission

2013 ◽  
Vol 28 (2) ◽  
pp. 216-230 ◽  
Author(s):  
Sheng-Kuei Chiu ◽  
Beth A. Manhat ◽  
William J.I. DeBenedetti ◽  
Anna L. Brown ◽  
Katye Fichter ◽  
...  
Keyword(s):  
Silicon Nanoparticles ◽  
Surface Passivation ◽  
Cellular Imaging ◽  
Red Emission ◽  
Image Position

Abstract

scholarly journals Are the Carriers of Diffuse Interstellar Bands and Extended Red Emission the same?

2020 ◽  
Author(s):  
Thomas S-Y Lai ◽  
Adolf N Witt ◽  
Carlos Alvarez ◽  
Jan Cami
Keyword(s):  
Molecular Ions ◽  
Ionization Front ◽  
Stellar Spectrum ◽  
Red Emission ◽  
Large Molecules ◽  
Radiation Fields ◽  
Diffuse Interstellar Bands ◽  
Vibrational Levels ◽  
Extended Red Emission ◽  
Photodissociation Region

Abstract We report the first spectroscopic observations of a background star seen through the region between the ionization front and the dissociation front of the nebula IC 63. This photodissociation region (PDR) exhibits intense extended red emission (ERE) attributed to fluorescence by large molecules/ions. We detected strong diffuse interstellar bands (DIB) in the stellar spectrum, including an exceptionally strong and broad DIB at λ4428. The detection of strong DIBs in association with ERE could be consistent with the suggestion that the carriers of DIBs and ERE are identical. The likely ERE process is recurrent fluorescence, enabled by inverse internal conversions from highly excited vibrational levels of the ground state to low-lying electronic states with subsequent transitions to ground. This provides a path to rapid radiative cooling for molecules/molecular ions, greatly enhancing their ability to survive in a strongly irradiated environment. The ratio of the equivalent widths (EW) of DIBs λ5797 and λ5780 in IC 63 is the same as that observed in the low-density interstellar medium with UV interstellar radiation fields (ISRF) weaker by at least two orders of magnitude. This falsifies suggestions that the ratio of these two DIBs can serve as a measure of the UV strength of the ISRF. Observations of the nebular spectrum of the PDR of IC 63 at locations immediately adjacent to where DIBs were detected failed to reveal any presence of sharp emission features seen in the spectrum of the Red Rectangle nebula. This casts doubts upon proposals that the carriers of these features are the same as those of DIBs seen at slightly shorter wavelengths.

The extended red emission filaments in NGC 2023

1989 ◽  
Vol 347 ◽  
pp. L25 ◽  
Author(s):  
Adolf N. Witt ◽  
David F. Malin
Keyword(s):  
Red Emission ◽  
Extended Red Emission
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