Results 71 to 80 of about 44,713 (249)

Chemistry of a protoplanetary disk with grain settling and Lyman alpha radiation

, 2010
We present results from a model of the chemical evolution of protoplanetary disks. In our models we directly calculate the changing propagation and penetration of a high energy radiation field with Lyman alpha radiation included.
Bergin, Edwin A., Bethell, Thomas J., Calvet, Nuria, Fogel, Jeffrey K. J., Semenov, Dmitry   +4 more
core   +1 more source

Enhancing Lipidomics With High‐Resolution Ion Mobility‐Mass Spectrometry

PROTEOMICS, EarlyView.
ABSTRACT Lipids, indispensable yet structurally intricate biomolecules, serve as critical regulators of cellular function and disease progression. Conventional lipidomics, constrained by limited resolution for isomeric and low‐abundance species, has been transformed by ion mobility‐mass spectrometry (IM‐MS).
Gaoyuan Lu, Shuling Xu, Penghsuan Huang, Lingjun Li   +3 more
wiley   +1 more source

Action spectroscopy of SrCl$^+$ using an integrated ion trap time-of-flight mass spectrometer

, 2014
The photodissociation cross-section of SrCl$^+$ is measured in the spectral range of 36000 -- 46000 cm$^{-1}$ using a modular time-of-flight mass spectrometer (TOF-MS). By irradiating a sample of trapped SrCl$^+$ molecular ions with a pulsed dye laser, X$
Hudson, Eric R., Kotochigova, Svetlana, Petrov, Alexander, Puri, Prateek, Schowalter, Steven J.   +4 more
core   +1 more source

Electron Transfer Dissociation and Synchrotron UV Photodissociation of Trapped Sodiated Ions Produced From Polyacrylates by Electrospray Ionization

Rapid Communications in Mass Spectrometry, EarlyView.
ABSTRACT Rationale Poly (acrylates)s can be distinguished from one another by the nature of their side chains. From model poly (acrylates)s, the purpose of this work was to evaluate the contribution of alternative activation techniques to the collisional activation, based on ion–ion and ion–photon interactions.
Inès Aloui, Véronique Legros, Cédric Przybylski, Matthieu Bourderioux, Alexandre Giuliani, William Buchmann   +5 more
wiley   +1 more source

Short-lived metal-centered excited state initiates iron-methionine photodissociation in ferrous cytochrome c

Nature Communications, 2021
The dissociation mechanism of the heme axial ligand in heme proteins is not yet fully understood. The authors investigate the photodissociation dynamics of the bond between heme Fe and methionine S in ferrous cytochrome c using femtosecond time-resolved ...
Marco E. Reinhard, Michael W. Mara, Thomas Kroll, Hyeongtaek Lim, Ryan G. Hadt, Roberto Alonso-Mori, Matthieu Chollet, James M. Glownia, Silke Nelson, Dimosthenis Sokaras, Kristjan Kunnus, Tim Brandt van Driel, Robert W. Hartsock, Kasper S. Kjaer, Clemens Weninger, Elisa Biasin, Leland B. Gee, Keith O. Hodgson, Britt Hedman, Uwe Bergmann, Edward I. Solomon, Kelly J. Gaffney   +21 more
doaj   +1 more source

Prediction of forbidden ultraviolet and visible emissions in comet 67P/Churyumov-Gerasimenko

, 2015
Remote observation of spectroscopic emissions is a potential tool for the identification and quantification of various species in comets. CO Cameron band (to trace \cod) and atomic oxygen emissions (to trace H$_2$O and/or CO$_2$, CO) have been used to ...
Bhardwaj, Anil, Galand, Marina, Raghuram, Susarla   +2 more
core   +1 more source

Photodissociation of interstellar N₂ [PDF]

Astronomy & Astrophysics, 2013
Molecular nitrogen is one of the key species in the chemistry of interstellar clouds and protoplanetary disks and the partitioning of nitrogen between N and N2 controls the formation of more complex prebiotic nitrogen-containing species. The aim of this work is to gain a better understanding of the interstellar N2 photodissociation processes based on ...
Wim Ubachs, Xiaohu Li, Brenton Lewis, Stephen Gibson, Ruud Visser, A. N. Heays, A. N. Heays, A. N. Heays, E. F. van Dishoeck   +8 more
openaire   +6 more sources

Low‐Temperature Photocrystallization of Atomic Layer Deposition‐Processed Tin Oxide for Highly Efficient and Flexible Perovskite Solar Cells

Small Science, EarlyView.
Photocrystallization of ALD‐processed SnO2 thin films is successfully achieved at a low temperature. High‐power UV exposure crystallizes amorphous SnO2 matrices within 15 min, enhancing electrical conductivity and band alignment with perovskite. This process enables the fabrication of highly reproducible and flexible perovskite solar cells with an ...
Dayeon Ko, Se Hun Joo, Sol Kim, In Soo Kim, Minwoo Park   +4 more
wiley   +1 more source

CALCULATION OF CHEMICAL EQUILIBRIUM IN THE INTERSTELLAR CLOUD

Odessa Astronomical Publications, 2017
In order to calculate the molecular concentrations in the interstellar cloud and to obtain heir spatial distribution we have made a computational code to solve the set of equations for chemical equilibrium and equations of charge and atom balance.
I. Shmeld, J. Freimanis, N. G. Bochkarev
doaj   +1 more source

H i in Molecular Clouds: Irradiation by FUV Plus Cosmic Rays

The Astrophysical Journal, 2023
We extend the analytic theory presented by Sternberg et al. and Bialy & Sternberg for the production of atomic hydrogen (H i ) via far-ultraviolet (FUV) photodissociation at the boundaries of dense interstellar molecular (H _2 ) clouds to also include ...
Amiel Sternberg, Shmuel Bialy, Alon Gurman   +2 more
doaj   +1 more source