Knudsen effusion mass spectrometric determination of the complex vapor composition of samarium, europium, and ytterbium bromides


Autoria(s): Sergeev, D. N.; Butman, M. F.; Motalov, V. B.; Kudin, L. S.; Krämer, Karl
Data(s)

20/06/2013

Resumo

RATIONALE The vaporization of Sm, Eu, and Yb tri- and dibromides is accompanied by decomposition and disproportionation reactions. These result in complex vapor compositions whose analysis is an intricate problem for experimentalists. Approaches have been developed to interpret mass spectra and accurately determine the vapor composition of thermally unstable compounds. METHODS A sector type magnet instrument was used. A combined ion source allowed the study of both the molecular and ionic vapor compositions in the electron ionization (EI) and the thermionic emission (TE) modes. The methodological approaches were based on a joint analysis of the ionization efficiency functions, the temperature and time dependences of the ion currents, and special mathematical data evaluation. RESULTS The vaporization of SmBr3, YbBr3, SmBr2, EuBr2, and YbBr2 was studied in the temperature range of 850–1300 K. An initial stage of incongruent vaporization was observed in the case of the tribromides, SmBr2, and YbBr2. This eventually changed to a congruent vaporization stage. Various neutral (Ln, Br, Br2, LnBr, LnBr2, LnBr3, Ln2Br4, Ln2Br5, and Ln2Br6) and charged (Br–, LnBr3–, LnBr4–) species were detected at different vaporization stages. CONCLUSIONS The quantitative vapor composition of Sm, Eu, and Yb tri- and dibromides was determined. It was found that only EuBr2 was stable in the studied temperature range. The developed approaches can be useful in the case of other thermally unstable compounds.

Formato

application/pdf

Identificador

http://boris.unibe.ch/39113/1/rcm6617.pdf

Sergeev, D. N.; Butman, M. F.; Motalov, V. B.; Kudin, L. S.; Krämer, Karl (2013). Knudsen effusion mass spectrometric determination of the complex vapor composition of samarium, europium, and ytterbium bromides. Rapid communications in mass spectrometry, 27(15), pp. 1715-1722. Chichester: Wiley 10.1002/rcm.6617 <http://dx.doi.org/10.1002/rcm.6617>

doi:10.7892/boris.39113

info:doi:10.1002/rcm.6617

urn:issn:0951-4198

Idioma(s)

eng

Publicador

Wiley

Relação

http://boris.unibe.ch/39113/

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Sergeev, D. N.; Butman, M. F.; Motalov, V. B.; Kudin, L. S.; Krämer, Karl (2013). Knudsen effusion mass spectrometric determination of the complex vapor composition of samarium, europium, and ytterbium bromides. Rapid communications in mass spectrometry, 27(15), pp. 1715-1722. Chichester: Wiley 10.1002/rcm.6617 <http://dx.doi.org/10.1002/rcm.6617>

Palavras-Chave #530 Physics #540 Chemistry
Tipo

info:eu-repo/semantics/article

info:eu-repo/semantics/publishedVersion

PeerReviewed