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Spontaneous and photo-induced decay processes of WF 5 - and HfF 5 - molecular anions in a cryogenic storage ring.

التفاصيل البيبلوغرافية
العنوان: Spontaneous and photo-induced decay processes of WF 5 - and HfF 5 - molecular anions in a cryogenic storage ring.
المؤلفون: Gnaser H; University of Vienna, Faculty of Physics, Isotope Physics - VERA Laboratory, A-1090 Wien, Austria., Martschini M; University of Vienna, Faculty of Physics, Isotope Physics - VERA Laboratory, A-1090 Wien, Austria., Leimbach D; Department of Physics, University of Gothenburg, SE-41296 Gothenburg, Sweden., Karls J; Department of Physics, University of Gothenburg, SE-41296 Gothenburg, Sweden., Hanstorp D; Department of Physics, University of Gothenburg, SE-41296 Gothenburg, Sweden., Indrajith S; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Ji M; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Martini P; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Simonsson A; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Zettergren H; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Schmidt HT; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Golser R; University of Vienna, Faculty of Physics, Isotope Physics - VERA Laboratory, A-1090 Wien, Austria.
المصدر: The Journal of chemical physics [J Chem Phys] 2022 Jul 28; Vol. 157 (4), pp. 044304.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: American Institute of Physics Country of Publication: United States NLM ID: 0375360 Publication Model: Print Cited Medium: Internet ISSN: 1089-7690 (Electronic) Linking ISSN: 00219606 NLM ISO Abbreviation: J Chem Phys Subsets: PubMed not MEDLINE; MEDLINE
أسماء مطبوعة: Publication: New York, NY : American Institute of Physics
Original Publication: Lancaster, Pa., American Institute of Physics.
مستخلص: Spontaneous and photo-induced decay processes of HfF 5 - and WF 5 - molecular anions were investigated in the Double ElectroStatic Ion Ring ExpEriment (DESIREE). The observation of these reactions over long time scales (several tens of ms) was possible due to the cryogenic temperatures (13 K) and the extremely low residual gas pressure (∼10 -14  mbar) of DESIREE. For photo-induced reactions, laser wavelengths in the range 240 to 450 nm were employed. Both anion species were found to undergo spontaneous decay via electron detachment or fragmentation. After some ms, radiative cooling processes were observed to lower the probability for further decay through these processes. Photo-induced reactions indicate the existence of an energy threshold for WF 5 - anions at about 3.5 eV, above which the neutralization yield increases strongly. By contrast, HfF 5 - ions exhibit essentially no enhanced production of neutrals upon photon interaction, even for the highest photon energy used in this experiment (∼5.2 eV). This suppression will be highly beneficial for the efficient detection, in accelerator mass spectrometry, of the extremely rare isotope 182 Hf using the 182 HfF 5 - anion while effectively reducing the interfering stable isobar 182 W in the analyte ion 182 WF 5 - . The radionuclide 182 Hf is of great relevance in astrophysical environments as it constitutes a potential candidate to study the events of nucleosynthesis that may have taken place in the vicinity of the solar system several million years ago.
تواريخ الأحداث: Date Created: 20220803 Latest Revision: 20220803
رمز التحديث: 20231215
DOI: 10.1063/5.0097896
PMID: 35922356
قاعدة البيانات: MEDLINE
الوصف
تدمد:1089-7690
DOI:10.1063/5.0097896