Results 61 to 70 of about 110,395 (224)

Centrosymmetric molecules as possible carriers of diffuse interstellar bands [PDF]

, 2010
In this paper, we present new data with interstellar C2 (Phillips bands A-X), from observations made with the Ultraviolet-Visual Echelle Spectrograph of the European Southern Observatory. We have determined the interstellar column densities and excitation temperatures of C2 for nine Galactic lines. For seven of these, C2 has never been observed before,
arxiv   +1 more source

The Orientation of the Local Interstellar Magnetic Field

, 2007
The orientation of the local interstellar magnetic field introduces asymmetries in the heliosphere that affect the location of heliospheric radio emissions and the streaming direction of ions from the termination shock of the solar wind.
Gombosi, T. I., Opher, M., Stone, E. C.
core   +1 more source

Solving the Puzzle of the Carbonic Acid Vibrational Spectrum – an Anharmonic Story

ChemPhysChem, Volume 25, Issue 22, November 18, 2024.
The harmonic picture is the basic approximation that allows the prediction of vibrational spectra. However, reality is neither decoupled nor harmonic. This can lead to problems in notation and the assignment of individual bands. Taking anharmonicity and mode coupling into account allows a drastic improvement in spectral clarity.
Jonas Schlagin, Dennis F. Dinu, Jürgen Bernard, Thomas Loerting, Hinrich Grothe, Klaus R. Liedl   +5 more
wiley   +1 more source

Overtone Transition 2ν1 of HCO+ and HOC+: Origin, Radiative Lifetime, Collisional Quenching

ChemPhysChem, Volume 25, Issue 21, November 4, 2024.
The C−H/O−H stretch vibration overtone of one of the simplest molecular ion isomeric systems HCO+/HOC+ is studied in a cryogenic ion trap experiment. Moreover, our comprehensive “zero background” method enables the determination of radiative lifetimes and select quenching reaction rates at the same time.
Miguel Jiménez‐Redondo, Liliia Uvarova, Petr Dohnal, Miroslava Kassayová, Paola Caselli, Pavol Jusko   +5 more
wiley   +1 more source

Mapping Our Path through the Local Interstellar Medium: High-resolution Ultraviolet Absorption Spectroscopy of Sight Lines along the Sun’s Historical Trajectory

The Astrophysical Journal
Using high-resolution UV data obtained from the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, we focus on eight sight lines along the Sun’s historical trajectory to reconstruct the morphology of our most recent interstellar ...
Hunter Vannier, Seth Redfield, Brian E. Wood, Hans-Reinhard Müller, Jeffrey L. Linsky, Priscilla C. Frisch   +5 more
doaj   +1 more source

Consequences of a Change in the Galactic Environment of the Sun [PDF]

, 1999
The interaction of the heliosphere with interstellar clouds has attracted interest since the late 1920's, both with a view to explaining apparent quasi-periodic climate "catastrophes" as well as periodic mass extinctions.
Baranov V. B., Fahr H. J., Faison M. D., Frisch P. C., Frisch P. C., Frisch P. C., G. P. Zank, Holzer T. E., Lallement R., McKay C. P., Murphy E. M., P. C. Frisch, Roble R. G., Shapley H., Tinsley B. A., Tinsley B. A., Zank G. P., Zank G. P.   +17 more
core   +2 more sources

Emergence of Optical Activity and Surface Morphology Changes in Racemic Amino Acid Films Under Circularly Polarized Lyman‐α Light Irradiation

Chirality, Volume 36, Issue 11, November 2024.
The photoreaction induced by Lyman‐α circularly polarized light (CPL) irradiation in racemic alanine film is more complex than simple preferential photolysis of enantiopure alanine molecules, and formation of larger molecules is observed. Circular networks of order of 100 nm scale are introduced in the alanine film surface by the irradiation.
Masahiro Kobayashi, Jun‐ichi Takahashi, Hiroshi Ota, Koichi Matsuo, Mohamed I. A. Ibrahim, Taketoshi Minato, Gen Fujimori, Masahiro Katoh, Kensei Kobayashi, Yoko Kebukawa, Hiroaki Nakamura   +10 more
wiley   +1 more source

Probing the range of applicability of structure‐ and energy‐adjusted QM/MM link bonds III: QM/MM MD simulations of solid‐state systems at the example of layered carbon structures

Journal of Computational Chemistry, Volume 45, Issue 26, Page 2186-2197, October 5, 2024).
The QM/MM simulation protocol involving carbonic link bonds was extended for the treatment of layered carbon structures to study the adsorption and intercalation properties of graphitic materials. Abstract The previously introduced workflow to achieve an energetically and structurally optimized description of frontier bonds in quantum mechanical ...
Felix R. S. Purtscher, Thomas S. Hofer
wiley   +1 more source

The interface between the outer heliosphere and the inner lism: Morphology of the local interstellar cloud, its hydrogen hole, stromgren shells, and $^{60}$Fe accretion [PDF]

, 2019
We describe the interface between the outer heliosphere and the local interstellar medium (LISM) surrounding the Sun. The components of the inner LISM are the four partially ionized clouds [the Local Interstellar Cloud (LIC), G cloud, Blue cloud, and Aql cloud] that are in contact with the outer heliosphere, and ionized gas produced by EUV radiation ...
arxiv   +1 more source

Microstructure of the Local Interstellar Cloud and the Identification of the Hyades Cloud [PDF]

, 2001
We analyze high-resolution UV spectra of the Mg II h and k lines for 18 members of the Hyades Cluster to study inhomogeneity along these proximate lines of sight.
Diamond C. J., Dupin O., Frisch P. C., Frisch P. C., Gry C., Hebrard G., Jeffrey L. Linsky, Lallement R., Lallement R., Lallement R., Lallement R., Perryman M. A. C., Perryman M. A. C., Seth Redfield, Sfeir D. M.   +14 more
core   +2 more sources