M. Kamińska

Medical University of Białystok

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Richard Thomas

Women & Children's Hospital of Buffalo

Mats Larsson

Stockholm University

Vitali Zhaunerchyk

University of Gothenburg

W. D. Geppert

Stockholm University

M. Hamberg

Uppsala University

E. Vigren

Swedish Institute of Space Physics

M. af Ugglas

Stockholm University

H. T. Schmidt

Stockholm University

H. Cederquist

Stockholm University

A. Källberg

Stockholm University

Cooperative Institutions

Association Française pour le Dépistage et la Prévention des Handicaps de l’Enfant

340

University of Liège

333

Shaheed Rajaei Cardiovascular Medical and Research Center

289

Associazione Nazionale Medici Cardiologi Ospedalieri

269

Institut de Recherche pour le Développement

230

Méditerranée Infection Foundation

228

Maria Cecilia Hospital

218

Erasmus MC

134

University of Leeds

134

Erasmus University Rotterdam

130

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Decays of excited silver-cluster anions Agn , n=4 to 7, in the Double ElectroStatic Ion Ring ExpEriment

Physical review. A/Physical review, A (2018)

E. K. Anderson M. Kamińska K. C. Chartkunchand Gustav Eklund Michael Gatchell

Spontaneous decays of small, hot silver-cluster anions ${\text{Ag}}_{n}^{\ensuremath{-}}$, $n=4--7$, have been studied using one of the rings of the Double ElectroStatic Ion Ring ExpEriment (DESIREE). Observation of these decays over very long time scales is possible due to the very low residual gas pressure ($\ensuremath{\sim}{10}^{\ensuremath{-}14}$) and cryogenic (13 K) operation of DESIREE. The yield of neutral particles from stored beams of ${\text{Ag}}_{6}^{\ensuremath{-}}$ and ${\text{Ag}}_{7}^{\ensuremath{-}}$ anions were measured for 100 milliseconds and were found to follow single power-law behavior with millisecond time-scale exponential cutoffs. The ${\text{Ag}}_{4}^{\ensuremath{-}}$ and ${\text{Ag}}_{5}^{\ensuremath{-}}$ anions were stored for 60 s and the observed decays show two-component power-law behaviors. We present calculations of the rate constants for electron detachment from and fragmentation of ${\text{Ag}}_{4}^{\ensuremath{-}}$ and ${\text{Ag}}_{5}^{\ensuremath{-}}$. In these calculations, we assume that the internal energy distribution of the clusters are flat and with this we reproduce the early steep parts of the experimentally measured decay curves for ${\text{Ag}}_{4}^{\ensuremath{-}}$ and ${\text{Ag}}_{5}^{\ensuremath{-}}$, which extends to tens and hundreds of milliseconds, respectively. The fact that the calculations reproduce the early slopes of ${\text{Ag}}_{4}^{\ensuremath{-}}$ and ${\text{Ag}}_{5}^{\ensuremath{-}}$, which differ for the two cases, suggests that it is the changes in fragmentation rates with internal cluster energies of ${\text{Ag}}_{4}^{\ensuremath{-}}$ and ${\text{Ag}}_{5}^{\ensuremath{-}}$ rather than conditions in the ion source that determine this behavior. Comparisons with the measurements strongly suggest that the neutral particles detected in these time domains originate from ${\text{Ag}}_{4}^{\ensuremath{-}}\ensuremath{\rightarrow}{\text{Ag}}_{3}^{\ensuremath{-}}+\text{Ag}$ and ${\text{Ag}}_{5}^{\ensuremath{-}}\ensuremath{\rightarrow}{\text{Ag}}_{3}^{\ensuremath{-}}+{\mathrm{Ag}}_{2}$ fragmentation processes.

10.1103/physreva.98.022705

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Citations (14)

Branching ratios and absolute cross sections of dissociative recombination processes of N₂O⁺

Physical Chemistry Chemical Physics (2005)

M. Hamberg W. D. Geppert Stefan Rosén F. Hellberg A. Ehlerding

We have investigated the dissociative recombination of the N2O+ ion using the CRYRING heavy-ion storage ring at the Manne Siegbahn laboratory in Stockholm, Sweden. The dissociative recombination branching ratios were determined at minimal (≈0 eV) collision energy, showing that the dominating pathways involved two-body fragmentation: N2 + O (48%) and NO + N (36%). The branching ratio of the three-body break-up 2N + O was 16%. The overall thermal rate coefficient of the title reaction follows the expression k(T) = 3.34 ± 0.75 × 10−7(T/300)−0.57±0.03 cm3 s−1, which correlates perfectly with earlier flowing afterglow studies on the same process.

Dissociative recombination

Branching fraction

Fragmentation

Branching (polymer chemistry)

Translational energy

10.1039/b417704e

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Dissociative recombination of fully deuterated protonated acetonitrile, CD3CND+: product branching fractions, absolute cross section and thermal rate coefficient

Physical Chemistry Chemical Physics (2008)

E. Vigren M. Kamińska M. Hamberg Vitali Zhaunerchyk Richard Thomas

The dissociative recombination of fully deuterated protonated acetonitrile, CD3CND+, has been investigated at the CRYRING heavy ion storage ring, located at the Manne Siegbahn Laboratory, Stockholm, Sweden. Branching fractions were measured at ∼0 eV relative collision energy between the ions and the electrons and in 65% of the DR events there was no rupture of bonds between heavy atoms. In the remaining 35%, one of the bonds between the heavy atoms was broken. The DR cross-section was measured between ∼0 eV and 1 eV relative collision energy. In the energy region between 1 meV and 0.1 eV the cross section data were best fitted by the expression σ = 7.37 × 10−16 (E/eV)−1.23 cm2, whereas σ = 4.12 × 10−16 (E/eV)−1.46 cm2 was the best fit for the energy region between 0.1 and 1.0 eV. From the cross section a thermal rate coefficient of α(T) = 8.13 × 10−7 (T/300)−0.69 cm3 s−1 was deduced.

Dissociative recombination

Branching (polymer chemistry)

Branching fraction

10.1039/b801566j

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Citations (34)

Radiative cooling of hot C_n⁻and C_nH⁻molecules

Journal of Physics Conference Series (2015)

M. Kamińska R F Nascimento Mark H. Stockett E. K. Anderson Rudy Delaunay

We have measured the rates of neutrals produced from 10 keV Cn− or CnH− (n=2, 4, 6, 8, and 10) ion beams stored in one of DESIREE's 14 K storage rings. For n=4, 6, and 8 we observe marked differences between Cn− and CnH− cooling rates as inverse internal conversion [cf. S. Martin et al (2013) Phys. Rev. Lett. 110, 063003] processes are effective for the Cn− ions only. Knowledge of the cooling rates of these ions are important for estimates of their formation and destruction rates in cold interstellar environments.

Radiative Cooling

10.1088/1742-6596/635/11/112124

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Dissociative Recombination - a Key Process in Ionospheres of Giant Planets and their Satellites

epsc (2007)

W. D. Geppert E. Vigren M. Hamberg Richard Thomas J. Semaniak

Dissociative recombination

Source

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[Para-aminosalicylic acid metabolism in the body. VII. Resorption and tolerance of calcium-PAS compound and early results of treatment of pulmonary tuberculosis].

PubMed (1972)

Jan W. Owsiński M. Kamińska A Ostrowska T Rapf

Para-aminosalicylic acid

Aminosalicylic acid

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Correction to: Surgery and outcome of infective endocarditis in octogenarians: prospective data from the ESC EORP EURO-ENDO registry

Infection (2022)

Michal Pazderník Bernard Iung Bülent Mutlu François Alla Robert K. Riezebos

Infective Endocarditis

10.1007/s15010-022-01883-y

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Experimental Studies of H¹³CO⁺ Recombining with Electrons at Energies between 2–50 000 meV

The Journal of Physical Chemistry A (2014)

M. Hamberg Iryna Kashperka Richard Thomas E. Roueff Vitali Zhaunerchyk

An investigation into the dissociative recombination process for H(13)CO(+) using merged ion-electron beam methods has been performed at the heavy ion storage ring CRYRING, Stockholm, Sweden. We have measured the branching fractions of the different product channels at ∼ 0 eV collision energy to be the following: CO + H 87 ± 2%, OH + C 9 ± 2%, and O + CH 4 ± 2%. The formation of electronically excited CO in the dominant reaction channel has also been studied, and we report the following tentative branching fractions for the different CO product electronic states: CO(X (1)Σ(+)) + H, 54 ± 10%; CO(a (3)Π) + H, 23 ± 4%; and CO(a' (3)Σ(+)) + H, 23 ± 4%. The absolute cross section between ∼ 2-50 000 meV was measured and showed resonance structures between 3 and 15 eV. The cross section was fitted in the energy range relevant to astrophysics, i.e., between 1 and 300 meV, and was found to follow the expression σ = 1.3 ± 0.3 × 10(-16) E(-1.29 ± 0.05) cm(2) and the corresponding thermal rate constant was determined to be k(T) = 2.0 ± 0.4 × 10(-7)(T/300)(-0.79 ± 0.05) cm(3) s(-1). Radioastronomical observations with the IRAM 30 m telescope of HCO(+) toward the Red Rectangle yielded an upper column density limit of 4 × 10(11) cm(-2) of HCO(+) at the 1σ level in that object, indicating that previous claims that the dissociative recombination of HCO(+) plays an important role in the production of excited CO molecules emitting the observed Cameron bands in that object are not supported.

Dissociative recombination

Branching fraction

Electron capture

10.1021/jp5032306

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Citations (11)

Disentangling formation of multiple-core holes in aminophenol molecules exposed to bright X-FEL radiation

Journal of Physics B Atomic Molecular and Optical Physics (2015)

Vitali Zhaunerchyk M. Kamińska Melanie Mucke Richard J. Squibb J. H. D. Eland

Competing multi-photon ionization processes, some leading to the formation of double core hole states, have been examined in 4-aminophenol. The experiments used the linac coherent light source (LCLS) x-ray free electron laser, in combination with a time-of-flight magnetic bottle electron spectrometer and the correlation analysis method of covariance mapping. The results imply that 4-aminophenol molecules exposed to the focused x-ray pulses of the LCLS sequentially absorb more than two x-ray photons, resulting in the formation of multiple core holes as well as in the sequential removal of photoelectrons and Auger electrons (so-called PAPA sequences).

Photoelectric effect

Free-electron laser

10.1088/0953-4075/48/24/244003

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Citations (21)

Angiotensin II: the risk factor for arterial thrombosissis

Kardiologia Polska (2013)

M. Kamińska Włodzimierz J. Musiał Ewa Chabielska

Układ renina-angiotensyna-aldosteron (RAAS) jest pierwotnie znany jako jeden z najważniejszych mechanizmów homeostazy regulujący ciśnienie tętnicze krwi oraz gospodarkę wodno-elektrolitową organizmu.Jednocześnie uczestniczy on w patogenezie wielu chorób układu sercowo-naczyniowego, a leki wpływające na jego aktywność mają ugruntowaną pozycję w terapii nadciśnienia tętniczego, niewydolności serca,

10.5603/kp.2013.0072

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Citations (2)