Absorption and Emission Characteristics of Interstellar Dust

1984 ◽  
pp. 5-35 ◽  
Author(s):  
Louis J. Allamandola
Keyword(s):  
Interstellar Dust ◽  
Emission Characteristics ◽  
Absorption And Emission

Tracing absorption and emission characteristics of halogen-bonded ion pairs involving halogenated imidazolium species

2021 ◽  
Vol 23 (12) ◽  
pp. 7480-7494
Author(s):  
Sarah Karbalaei Khani ◽  
Bastian Geissler ◽  
Elric Engelage ◽  
Patrick Nuernberger ◽  
Christof Hättig
Keyword(s):  
Ion Pairs ◽  
Ion Pairing ◽  
Emission Characteristics ◽  
Absorption And Emission ◽  
Spectroscopic Signatures

Spectroscopic signatures of ion-pairing are identified by variation of counterion and substitution and comparison with theory.

scholarly journals Biofluorescent Worlds – II. Biological fluorescence induced by stellar UV flares, a new temporal biosignature

2019 ◽  
Vol 488 (4) ◽  
pp. 4530-4545 ◽  
Author(s):  
Jack T O'Malley-James ◽  
Lisa Kaltenegger
Keyword(s):  
Cloud Cover ◽  
Visible Spectrum ◽  
Uv Protection ◽  
Emission Characteristics ◽  
Large Telescope ◽  
Atmospheric Absorption ◽  
Absorption And Emission ◽  
Temporary Change ◽  
Fluorescent State ◽  
M Stars

ABSTRACT Our first targets in the search for signs of life are orbiting nearby M stars, such as the planets in the Proxima Centauri, Ross-128, LHS-1140, and TRAPPIST-1 systems. Future ground-based discoveries, and those from the TESS mission, will provide additional close-by targets. However, young M stars tend to be very active, flaring frequently and causing UV fluxes on the surfaces of HZ planets to become biologically harmful. Common UV-protection methods used by life (e.g. living underground, or underwater) would make a biosphere harder to detect. However, photoprotective biofluorescence, ‘up-shifting’ UV to longer, safer wavelengths, could increase a biosphere's detectability. Here we model intermittent emission at specific wavelengths in the visible spectrum caused by biofluorescence as a new temporal biosignature for planets around active M stars. We use the absorption and emission characteristics of common coral fluorescent pigments and proteins to create model spectra and colours for an Earth-like planet in such a system, accounting for different surface features, atmospheric absorption, and cloud cover. We find that for a cloud-free planet biofluorescence could induce a temporary change in brightness that is significantly higher than the reflected flux alone, causing up to two orders-of-magnitude change in planet–star contrast, compared to a non-fluorescent state, if the surface is fully covered by a highly efficient fluorescent biosphere. Hence, UV-flare induced biofluorescence presents previously unexplored possibilities for a new temporal biosignature that could be detectable by instruments like those planned for the extremely large telescope and could reveal hidden biospheres.

Highly efficient photosensitizers with aggregation-induced emission characteristics obtained through precise molecular design

2017 ◽  
Vol 53 (62) ◽  
pp. 8727-8730 ◽  
Author(s):  
Shidang Xu ◽  
Wenbo Wu ◽  
Xiaolei Cai ◽  
Chong-Jing Zhang ◽  
Youyong Yuan ◽  
...  
Keyword(s):  
Molecular Design ◽  
Emission Characteristics ◽  
Aggregation Induced Emission ◽  
Absorption And Emission ◽  
Highly Efficient ◽  
Tunable Absorption

Through precise molecular design, predictable properties including photosensitizing efficacy, tunable absorption and emission wavelengths and aggregation-induced emission characteristics were achieved.

scholarly journals Absorption and Emission Characteristics of Diffuse Spherical Enclosures

1962 ◽  
Vol 84 (2) ◽  
pp. 188-189 ◽  
Author(s):  
E. M. Sparrow ◽  
V. K. Jonsson
Keyword(s):  
Emission Characteristics ◽  
Absorption And Emission

On the photophysical properties of IrIII, PtII, and PdII (phenylpyrazole) (phenyldipyrrin) complexes

2020 ◽  
Vol 22 (6) ◽  
pp. 3217-3233 ◽  
Author(s):  
Jelena Föller ◽  
Daniel H. Friese ◽  
Stefan Riese ◽  
Jeremy M. Kaminski ◽  
Simon Metz ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Emission Characteristics ◽  
Absorption And Emission ◽  
Theory And Experiment

The absorption and emission characteristics of (ppz)2(dipy)IrIII, (ppz)(dipy)PtII and (ppz)(dipy)PdII, where ppz stands for a phenylpyrazole and dipy for a phenyl meso-substituted dipyrrin ligand, have been investigated by theory and experiment.

Sign in / Sign up

Export Citation Format

Share Document