A5028549766- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Astrophysics and Star Formation Studies
- Mass Spectrometry Techniques and Applications
- Molecular Spectroscopy and Structure
- Planetary Science and Exploration
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Spaceflight effects on biology
- Spectroscopy and Laser Applications
- Space Science and Extraterrestrial Life
- Atmospheric chemistry and aerosols
- Geology and Paleoclimatology Research
- Stellar, planetary, and galactic studies
- Space Exploration and Technology
- Quantum, superfluid, helium dynamics
- Ion-surface interactions and analysis
- Isotope Analysis in Ecology
- Analytical Chemistry and Chromatography
- Catalytic Processes in Materials Science
- Methane Hydrates and Related Phenomena
- Free Radicals and Antioxidants
- Photochemistry and Electron Transfer Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Various Chemistry Research Topics
Stockholm University
2015-2024
Astrobiology Center
2015-2022
Swedish University of Agricultural Sciences
2022
AlbaNova
2010-2021
Max Planck Institute for Astronomy
2021
Max Planck Society
2021
Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry
2018
Georgia Institute of Technology
2014
KTH Royal Institute of Technology
2014
University of Gothenburg
2010-2013
We present a novel chemical database for gas-phase astrochemistry. Named the KInetic Database Astrochemistry (KIDA), this consists of reactions with rate coefficients and uncertainties that will be vetted to greatest extent possible. Submissions measured calculated are welcome, studied by experts before inclusion into database. Besides providing kinetic information interstellar medium, KIDA is planned contain such data planetary atmospheres circumstellar envelopes. Each year, subset in...
Chemical models used to study the chemical composition of gas and ices in interstellar medium are based on a network reactions associated rate coefficients. These coefficients partially compiled from data literature, when available. We present this paper kida.uva.2014, new updated version kida.uva public gas-phase first released 2012. In addition description many specific updates, we illustrate changes predicted abundances molecules for cold dense cloud conditions as compared with results...
The branching ratios of the different reaction pathways and overall rate coefficients dissociative recombination reactions CH3OH2+ CD3OD2+ have been measured at CRYRING storage ring located in Stockholm, Sweden. Analysis data yielded result that formation methanol or deuterated accounted for only 3 6% total CD3OD2+, respectively. Dissociative both isotopomeres mainly involves fragmentation C-O bond, major process being three-body break-up forming CH3, OH H (CD3, OD D). cross sections are...
We survey the current situation regarding chemical modelling of synthesis molecules in interstellar medium. The present state knowledge concerning rate coefficients and their uncertainties for major gas-phase processes—ion-neutral reactions, neutral-neutral radiative association, dissociative recombination—is reviewed. Emphasis is placed on those key reactions that have been identified, by sensitivity analyses, as 'crucial' determining predicted abundances species observed These analyses...
We report on the first storage of ion beams in Double ElectroStatic Ion Ring ExpEriment, DESIREE, at Stockholm University. have produced atomic carbon anions and small anion molecules (\documentclass[12pt]{minimal}\begin{document}${\rm C}_n^-$\end{document}Cn−, n = 1, 2, 3, 4) a sputter source. The were accelerated to 10 keV kinetic energy stored an electrostatic ring enclosed vacuum chamber 13 K. For \documentclass[12pt]{minimal}\begin{document}${\rm C}_2^-$\end{document}C2− molecular we...
Absolute photodetachment cross sections of two anions astrophysical importance CN− and C3N− were measured to be (1.18 ± (0.03)stat(0.17)sys) × 10−17 cm2 (1.43 (0.14)stat(0.37)sys) cm2, respectively, at the ultraviolet (UV) wavelength 266 nm (4.66 eV). These relatively large values imply that can play a major role in destruction mechanisms these particularly photon-dominated regions. We have therefore carried out model calculations using newly investigate abundance molecular cirumstellar...
The dynamics of the H displacement channels in reaction N((2)D) + C(2)H(4) have been investigated by crossed molecular beam technique with mass spectrometric detection and time-of-flight analysis at two different collision energies (17.2 28.2 kJ/mol). interpretation scattering results is assisted new electronic structure calculations stationary points product energetics for C(2)H(4)N ground state doublet potential energy surface. RRKM statistical performed to derive branching ratio under...
Branching ratios and absolute cross sections have been measured for the dissociative recombination of N2H+ using CRYRING ion storage ring. It has found that channel + e- → N2 H accounts only 36% total reaction branching into other exoergic pathway, NH N, consequently amounts to 64%. The section could be fitted by expression σ = (2.4 ± 0.4) × 10-16E-1.04±0.02 cm2, which leads a thermal rate k(T) (1.0 0.2) 10-7(T/300)-0.51±0.02 cm3 s-1, in favorable agreement with previous flowing afterglow...
The fast reaction between C(3P) and C2H2 is thought to be an important process in dense interstellar clouds as it provides a mechanism for the growth of carbon chains. This feature article describes complementary series recent experimental theoretical investigations on this reaction. includes kinetic measurements rate constants at low temperatures crossed molecular beam determinations integral differential cross sections. theory employs first-principles electronic structure computations wave...
In response to ESA Voyage 2050 announcement of opportunity, we propose an ambitious L-class mission explore one the most exciting bodies in Solar System, Saturn largest moon Titan. Titan, a "world with two oceans", is organic-rich body interior-surface-atmosphere interactions that are comparable complexity Earth. Titan also few places System habitability potential. remarkable nature was only partly revealed by Cassini-Huygens and still holds mysteries requiring complete exploration using...
The phenol⋅N2 complex cation has been studied with a combination of two-color resonant zero kinetic energy (ZEKE) and mass analyzed threshold ionization (MATI) spectroscopies to probe the interaction polar quadrupolar solvent molecule. Extended vibrational progressions are observed in three modes which assigned as in-plane bend (35 cm−1), stretch (117 wag (130 cm−1) intermolecular vibrations, consistent structure where N2 forms directional bond phenol OH group plane aromatic ring. Ab initio...
Aims.We investigate the physical and chemical conditions in a typical star forming region, including an unbiased search for new molecules spectral region previously unobserved.
<i>Aims. <i/>Determination of branching fractions, cross sections and thermal rate coefficients for the dissociative recombination CD<sub>3<sub/>OCD<sub>2<sub/><sup>+<sup/> (0–0.3 eV) (CD<sub>3<sub/>)<sub>2<sub/>OD<sup>+<sup/> (0–0.2 at low relative kinetic energies encountered in interstellar medium.<i>Methods. <i/>The measurements were carried out using merged electron ion beams CRYRING storage ring, Stockholm, Sweden.<i>Results. <i/>For we have experimentally determined fraction ejection...
The dissociative recombination (DR) of N2H+ has been reinvestigated at the heavy ion storage ring CRYRING Manne Siegbahn Laboratory in Stockholm, Sweden. Thermal rate coefficients for electron temperatures between 10 and 1000 K have deduced. We show that is expected to play an approximately equally important role as CO removal dark interstellar clouds. note a deeper knowledge on influence ions' rotational temperature DR would be helpful set further constraints relative importance different...
We report the results of two sets experiments on each reactions and
Dissociative recombination is a corner-stone reaction in the synthesis of interstellar molecules and plays an important role ionised layers atmospheres Earth, other planets, their satellites. The studies dissociative reactions was for long time dominated by afterglow techniques, these techniques are used improved versions also today, but bulk relevant data have recent years been produced at ion storage rings. We review briefly different experimental techniques. As examples developments...
The determination of the dissociative recombination rate coefficient H(3) (+) has had a turbulent history, but both experiment and theory have recently converged to common value. Despite this convergence, it not been clear if there should be difference between coefficients for ortho-H(3) para-H(3) (+). A predicted theoretically could conceivably impact ortho:para ratio in diffuse interstellar medium, where widely observed. We present results an at CRYRING ion storage ring which we...
We have measured dissociative recombination of HCl+ with electrons using a merged beams configuration at the heavy-ion storage ring TSR located Max Planck Institute for Nuclear Physics in Heidelberg, Germany. present absolute rate coefficient collision energies from 0 to 4.5 eV. also developed new method deriving cross section measurements. Our approach does not suffer approximations made by previously used methods. The was transformed plasma electron temperature range T=10 5000 K. show that...
The weakly bound 1:1 complex between acrylonitrile (CH2═CHCN) and water has been characterized spectroscopically in the millimeter wave range (59.6-74.4 GHz) using a Free Jet Absorption Millimeter Wave spectrometer. Precise values of rotational quartic centrifugal distortion constants have obtained from measured frequencies normal isotopically substituted moiety (DOH, DOD, H(18)OH). Structural parameters estimated their differences among isotopologues: planar structure with two subunits held...