Rapid communications in mass spectrometry : RCM · 2026
Near-Threshold Photodetachment of WF5 - Molecular Anions in a Cryogenic Storage Ring.
СтатьяНазвание и аннотация: Перевод в очереди
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Martschini Martin, Leimbach David, Gnaser Hubert, Hanstorp Dag, Ji Mingchao, Martini Paul, Simonsson Ansgar, Poulose Rachel, Björkhage Mikael, Zettergren Henning, Schmidt Henning T, Golser Robin
Аннотация
RATIONALE: The molecular anion WF5 - constitutes an isobaric interference for the mass spectrometric detection of the HfF5 - anion. The latter is expected to form an extremely sensitive way of detecting the radionuclide 182Hf at natural levels using, for example, accelerator mass spectrometry.
METHODS: Photoinduced detachment of WF5 - molecular anions was studied in the Double ElectroStatic Ion Ring ExpEriment (DESIREE), with the ring cooled to cryogenic temperatures (~13 K). Photon energies from 2.5 to 4.5 eV were applied using an OPO laser system for excitation. This energy range covers the threshold for the removal of an electron from that anion species.
RESULTS: Photoinduced reactions were observed which indicate the existence of an energy threshold for WF5 - anions above which the neutralization yield increases strongly. In that range, the data of the neutral signal could be fitted by a linear function of photon energy E, yielding a threshold energy Eth = 3.13 ± 0.01 eV. This result constitutes a substantial improvement both in the range and the resolution of the photon energy as compared to previous data and provides now a rather precise value for that threshold.
CONCLUSIONS: This knowledge is required for any attempts to suppress WF5 - anions by photodetachment in the ultrasensitive detection of the very rare radioisotope 182Hf using the 182HfF5 - analyte anion; for that, the 182WF5 - anion would be a stable isobaric mass interference for analyses by accelerator mass spectrometry. The radionuclide 182Hf is considered of great interest in various astrophysical environments such as nucleosynthetic processes.
METHODS: Photoinduced detachment of WF5 - molecular anions was studied in the Double ElectroStatic Ion Ring ExpEriment (DESIREE), with the ring cooled to cryogenic temperatures (~13 K). Photon energies from 2.5 to 4.5 eV were applied using an OPO laser system for excitation. This energy range covers the threshold for the removal of an electron from that anion species.
RESULTS: Photoinduced reactions were observed which indicate the existence of an energy threshold for WF5 - anions above which the neutralization yield increases strongly. In that range, the data of the neutral signal could be fitted by a linear function of photon energy E, yielding a threshold energy Eth = 3.13 ± 0.01 eV. This result constitutes a substantial improvement both in the range and the resolution of the photon energy as compared to previous data and provides now a rather precise value for that threshold.
CONCLUSIONS: This knowledge is required for any attempts to suppress WF5 - anions by photodetachment in the ultrasensitive detection of the very rare radioisotope 182Hf using the 182HfF5 - analyte anion; for that, the 182WF5 - anion would be a stable isobaric mass interference for analyses by accelerator mass spectrometry. The radionuclide 182Hf is considered of great interest in various astrophysical environments such as nucleosynthetic processes.