Results 111 to 120 of about 16,662 (218)

Vacuum Ultraviolet Single Photon Ionization and Decomposition of 2-Aminopropionitrile in Astrophysical Objects

The Astrophysical Journal
The molecule 2-aminopropionitrile (2-APN; H _3 CCH(NH _2 )CN) is a chiral precursor of the amino acid alanine and could play an important role in the emergence of the homochirality of life.
Helgi Rafn Hrodmarsson, Martin Schwell, Nicolas Fray, Jean-Claude Guillemin, Majdi Hochlaf, Emilie-Laure Zins   +5 more
doaj   +1 more source

Phospholipid Profiling Established by Structure‐Rich Fragments for Molecular Species Level Shotgun Analysis

Rapid Communications in Mass Spectrometry, Volume 40, Issue 8, 30 April 2026.
ABSTRACT Rationale Accurate identification of phospholipid molecular species remains a major challenge in shotgun lipidomics because conventional tandem mass spectrometry typically resolves only one structural moiety at a time. This structural ambiguity limits confident lipid biomarker discovery and biological interpretation.
Rong Chen, Amber H. Jannasch, Bruce R. Cooper, Jonathan H. Shannahan, Christina R. Ferreira   +4 more
wiley   +1 more source

Photodissociation and photoionisation of atoms and molecules of astrophysical interest [PDF]

, 2017
A new collection of photodissociation and photoionisation cross sections for 102 atoms and molecules of astrochemical interest has been assembled, along with a brief review of the basic processes involved.
Bosman, A. D., Heays, A. N., van Dishoeck, E. F.   +2 more
core   +3 more sources

The Interstellar Medium in I Zw 18 Seen with JWST/MIRI. II. Warm Molecular Hydrogen and Warm Dust

The Astrophysical Journal
We present JWST/MIRI spectra from the Medium-resolution Spectrometer of I Zw 18, a nearby dwarf galaxy with a metallicity of ∼3% Solar. Here, we investigate warm molecular hydrogen, H _2 , observed in spectra extracted in ∼120 pc apertures centered on ...
L. K. Hunt, B. T. Draine, M. G. Navarro, A. Aloisi, R. J. Rickards Vaught, A. Adamo, F. Annibali, D. Calzetti, S. Hernandez, B. L. James, M. Mingozzi, R. Schneider, M. Tosi, B. Brandl, M. G. del Valle-Espinosa, F. Donnan, A. S. Hirschauer, M. Meixner, D. Rigopoulou   +18 more
doaj   +1 more source

From the Modeling of Experiments to the Ab Initio Prediction of Rate Constants: Statistical Rate Theory for a Quantitative Understanding of Gas‐Phase Ion Chemistry

ChemPhysChem, Volume 27, Issue 8, 28 April 2026.
For directly comparing experimental results on gas‐phase ion reactions with the predictions from quantum chemical calculations, the latter must first be converted into rate constants. This review addresses the question of whether current methods of statistical rate theory can accomplish this task reliably. Statistical rate theory has long been used for
Thomas Auth, Konrad Koszinowski
wiley   +1 more source

Ultrafast electron diffractive imaging of the dissociation of pre-excited molecules

Physical Review Research
Gas phase ultrafast electron diffraction (GUED) has become a powerful technique to directly observe the structural dynamics of photoexcited molecules.
Yanwei Xiong, Haoran Zhao, Sri Bhavya Muvva, Cuong Le, Lauren F. Heald, Jackson Lederer, Martin Centurion   +6 more
doaj   +1 more source

Atomic Hydrogen produced in M33 Photodissociation Regions

Monthly Notices of the Royal Astronomical Society, 2011
Accepted for publication in MNRAS.
Heiner, J. S., Allen, R. J., van der Kruit, P. C.   +2 more
openaire   +3 more sources

Air Quality Penalty in Southeast Asia Driven by AMOC Slowdown

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract The Atlantic Meridional Overturning Circulation (AMOC) regulates Earth's climate by redistributing heat and freshwater across the Atlantic Ocean. While accelerating Arctic melt is expected to weaken the AMOC, its implications for atmospheric composition remain poorly understood.
Ryan Vella, Benedikt Steil, Virna Meccia, Holger Tost, Jos Lelieveld, Andrea Pozzer   +5 more
wiley   +1 more source

A model for atomic and molecular interstellar gas: The Meudon PDR code [PDF]

, 2006
We present the revised ``Meudon'' model of Photon Dominated Region (PDR code), presently available on the web under the Gnu Public Licence at: http://aristote.obspm.fr/MIS.
Abgrall H., Cyrine Nehme, de Jong T., Dickinson A. S., Dufton P. L., Evelyne Roueff, Fitzpatrick E. L., Franck Le Petit, Habing H., Jacques Le Bourlot, Joulain K., Launay J. M., Lavendy H., Le Bourlot J., Le Bourlot J., Le Bourlot J., Le Bourlot J., Lee H.-H., Monteiro T. S., Pequignot D., Pequignot D., Roueff E., Roueff E.   +22 more
core   +6 more sources

Photodissociation dynamics of propionyl chloride in the ultraviolet region

The Journal of Chemical Physics, 2009
Velocity imaging technique combined with (2+1) resonance-enhanced multiphoton ionization (REMPI) is used to detect primary photodissociation of propionyl chloride. In one-color experiments at 235 nm, the Cl and Cl∗ fragments are produced rapidly, leading to a fraction of translational energy release of 0.37 and 0.35, anisotropy parameters of 1.1 and 0 ...
Wei, Z. R., Zhang, X. P., Lee, W. B., Zhang, B., Lin, K. C.   +4 more
openaire   +3 more sources