Results 61 to 70 of about 14,587 (250)

Hot Stars, Young Stellar Populations and Dust with Swift/UVOT

Universe
In this review, we highlight the contributions made by the Swift/UVOT instrument to the understanding of the ultraviolet (UV) attenuation and extinction properties of interstellar dust and provide insight into hot stars and young stellar populations. The
Michael H. Siegel, Caryl Gronwall
doaj   +1 more source

A catalog of ultraviolet interstellar extinction excesses for 1415 stars

The Astrophysical Journal Supplement Series, 1985
Ultraviolet interstellar extinction excesses are presented for 1415 stars with spectral types B7 and earlier. The excesses with respect to V are derived from Astronomical Netherlands Satellite (ANS) 5-channel UV photometry at central wavelengths of approximately 1550, 1800, 2500, and 3300 A.
SAVAGE, BD, MASSA, D, MEADE, M, Wesselius, P. R.   +3 more
openaire   +2 more sources

Azaporphyrinoid‐Based Photo‐ and Electroactive Architectures for Advanced Functional Materials

Advanced Materials, EarlyView.
A long‐standing collaboration between the Torres and Guldi groups has yielded diverse azaporphyrinoid‐based donor‐acceptor nanohybrids with promising applications in solar energy conversion. This conspectus highlights key molecular platforms and structure‐function relationships that govern light and charge management, supporting the rational design of ...
Jorge Labella, Kobra Azizi, Dirk M. Guldi, Tomás Torres   +3 more
wiley   +1 more source

Nature or Nurture: LMC-like Dust in the Solar Metallicity Galaxy M31

The Astrophysical Journal
Using the Hubble Space Telescope/Space Telescope Imaging Spectrograph, ultraviolet (UV) extinction curves have been measured in M31 along 13 new sight lines, increasing the M31 sample to 17.
Geoffrey C. Clayton, Petia Yanchulova Merica-Jones, Karl D. Gordon, Marjorie Decleir, Claire E. Murray, Ralph Bohlin, Luciana Bianchi, Philip Massey, Michael J. Wolff   +8 more
doaj   +1 more source

An ultraviolet extinction study of the rho Ophiuchi dark cloud

The Astrophysical Journal, 1980
Five-band ultraviolet spectrophotometry has been carried out for 54 stars in the upper Scorpius complex. Of these, 14 stars in the rho Ophiuchi dark cloud and 13 in the surrounding area are found to be free of spectral peculiarities and contamination by scattered light from nearby bright stars.
WU, CC, GILRA, DP, VANDUINEN, RJ
openaire   +2 more sources

The role of the charge state of PAHs in ultraviolet extinction [PDF]

Astronomy & Astrophysics, 2008
Aims: We explore the relation between charge state of polycyclic aromatic hydrocarbons (PAHs) and extinction curve morphology. Methods: We fit extinction curves with a dust model including core-mantle spherical particles of mixed chemical composition (silicate core, $sp^2$ and $sp^3$ carbonaceous layers), and an additional molecular component.
CECCHI PESTELLINI, CESARE, MALLOCI, GIULIANO, Mulas, G., Joblin, C., Williams, D. A.   +4 more
openaire   +3 more sources

Chiral Microneedle Arrays With Terahertz Chiroptical Activity With Chiral‐Plasmon‐Chiral‐Phonon Resonance

Advanced Materials, EarlyView.
ABSTRACT Microneedle arrays (MNAs) is a rapidly emerging technology with broad biomedical applications in drug delivery and biosensing. With sub‐millimeter dimensions and periodicity, MNAs possess geometries nearly ideal for biomedical devices operating within the terahertz (THz) spectral window.
Sang Hyun Lee, Hong Ju Jung, John Kim, Bum Chul Park, Caio V. C. R. da Silva, André F. de Moura, Nicholas A. Kotov   +6 more
wiley   +1 more source

Combined, table-top extreme-ultraviolet ellipsometry and polarimetry for studying ultrafast processes in matter

JPhys Photonics
We demonstrate the characterization of the complete polarization state of broadband extreme-ultraviolet radiation produced via high-harmonic generation in a gas target, measured with a double-stage polarimeter and a reaction microscope. The ellipsometric
Lénárd Gulyás Oldal, Barnabás Gilicze, Tamás Bartyik, Dániel Kiss, Michele Devetta, Gabriele Zeni, Fabio Frassetto, Luca Poletto, Tamás Csizmadia, Balázs Major   +9 more
doaj   +1 more source

When Poor Exciton Dissociation Limits Photocurrents in Organic Solar Cells: Why Low Offset Non‐Fullerene Acceptor Blends Can't Be Efficient

Advanced Materials, EarlyView.
The energetic offset between the donor and the acceptor components in organic photoactive layers is central to the tradeoff between photovoltage and photocurrent losses. This Perspective covers the most important issues surrounding this topic in non‐fullerene acceptor blends, from the difficulty of accurately determining state energies and driving ...
Dieter Neher, Manasi Pranav
wiley   +1 more source

Large Variations Seen in First Ultraviolet Spectroscopic M33 Dust Extinction Curves

The Astrophysical Journal
Dust extinction curves provide one of the main avenues to understanding the detailed nature of dust grains and accounting for the effects of dust on observations of many astrophysical objects. For the first time, spectroscopic ultraviolet (UV) extinction
Karl D. Gordon, Petia Yanchulova Merica-Jones, Geoffrey C. Clayton, Ralph Bohlin, Marjorie Decleir, Claire E. Murray, Luciana Bianchi   +6 more
doaj   +1 more source