Kinetic energy dependent reactions of Th+ with H2, D2, and HD were studied using a guided ion beam tandem mass spectrometer. Formation of ThH+ and ThD+ is endothermic in all cases with similar thresholds. Branching ratio results for the reaction with HD indicate that Th+ reacts via a statistical mechanism, similar to Hf+. The kinetic energy dependent cross sections for formation of ThH+ and ThD+ were evaluated to determine a 0 K bond dissociation energy (BDE) of D0(Th+–H) = 2.45 ± 0.07 eV. This value is in good agreement with a previous result obtained from analysis of the Th+ + CH4 reaction. D0(Th+–H) is observed to be larger than its transition metal congeners, TiH+, ZrH+, and HfH+, believed to be a result of lanthanide contraction. The reactions with H2 were also explored using quantum chemical calculations that include a semiempirical estimation and explicit calculation of spin–orbit contributions. These calculations agree nicely and indicate that ThH+ most likely has a 3Δ1 ground level with a low-lying 1Σ+ excited state. As a result, theory also provides the reaction potential energy surfaces and BDEs that are in reasonable agreement with experiment.
Cox, Richard M., et al. "Reactions of Th<sup>+</sup> + H<sub>2</sub>, D<sub>2</sub>, and HD Studied by Guided Ion Beam Tandem Mass Spectrometry and Quantum Chemical Calculations." Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, vol. 120, no. 8, Sep. 2015. https://doi.org/10.1021/acs.jpcb.5b08008
Cox, Richard M., Armentrout, P. B., & de Jong, Wibe A. (2015). Reactions of Th<sup>+</sup> + H<sub>2</sub>, D<sub>2</sub>, and HD Studied by Guided Ion Beam Tandem Mass Spectrometry and Quantum Chemical Calculations. Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, 120(8). https://doi.org/10.1021/acs.jpcb.5b08008
Cox, Richard M., Armentrout, P. B., and de Jong, Wibe A., "Reactions of Th<sup>+</sup> + H<sub>2</sub>, D<sub>2</sub>, and HD Studied by Guided Ion Beam Tandem Mass Spectrometry and Quantum Chemical Calculations," Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry 120, no. 8 (2015), https://doi.org/10.1021/acs.jpcb.5b08008
@article{osti_1393033,
author = {Cox, Richard M. and Armentrout, P. B. and de Jong, Wibe A.},
title = {Reactions of Th<sup>+</sup> + H<sub>2</sub>, D<sub>2</sub>, and HD Studied by Guided Ion Beam Tandem Mass Spectrometry and Quantum Chemical Calculations},
annote = {Kinetic energy dependent reactions of Th+ with H2, D2, and HD were studied using a guided ion beam tandem mass spectrometer. Formation of ThH+ and ThD+ is endothermic in all cases with similar thresholds. Branching ratio results for the reaction with HD indicate that Th+ reacts via a statistical mechanism, similar to Hf+. The kinetic energy dependent cross sections for formation of ThH+ and ThD+ were evaluated to determine a 0 K bond dissociation energy (BDE) of D0(Th+–H) = 2.45 ± 0.07 eV. This value is in good agreement with a previous result obtained from analysis of the Th+ + CH4 reaction. D0(Th+–H) is observed to be larger than its transition metal congeners, TiH+, ZrH+, and HfH+, believed to be a result of lanthanide contraction. The reactions with H2 were also explored using quantum chemical calculations that include a semiempirical estimation and explicit calculation of spin–orbit contributions. These calculations agree nicely and indicate that ThH+ most likely has a 3Δ1 ground level with a low-lying 1Σ+ excited state. As a result, theory also provides the reaction potential energy surfaces and BDEs that are in reasonable agreement with experiment.},
doi = {10.1021/acs.jpcb.5b08008},
url = {https://www.osti.gov/biblio/1393033},
journal = {Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry},
issn = {ISSN 1520-6106},
number = {8},
volume = {120},
place = {United States},
publisher = {American Chemical Society},
year = {2015},
month = {09}}
Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, Vol. 122, Issue 790, p. 513-532https://doi.org/10.1098/rspa.1929.0037