Spin-orbit effects in gas-phase chemical reactions

Dagdigian, Paul J.; Campbell, Mark L.

doi:10.1021/cr00077a001

Cited by 114 publications

(40 citation statements)

References 64 publications

(79 reference statements)

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“…Our studies are part of a broad effort to obtain a better understanding of spin-orbit effects in gas phase reactions, as previously discussed by Dagdigian and Campbell [16]. We also mention in this context recent work on chemical reactions involving state-selected metastable rare gas atoms, e.g.…”

Section: Introductionmentioning

confidence: 83%

The state dependence of the interaction of metastable rare gas atoms Rg*(ms3 P 2,3 P 0) (Rg=Ne, Ar, Kr, Xe) with ground state sodium atoms

Schohl

Müller

Meijer

et al. 1990

Z Phys D - Atoms, Molecules and Clusters

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The state dependence of the interaction of metastable rare gas atoms Rg* (ms 3P2, 3P0) (Rg = Ne, Ar, Kr, Xe) with ground state sodium atoms Schohl, S.; Müller, M.W.; Meijer, H.A.J.; Ruf, M.-W.; Hotop, H.; Morgner, H. Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Schohl, S., Müller, M. W., Meijer, H. A. J., Ruf, M-W., Hotop, H., & Morgner, H. (1990). The state dependence of the interaction of metastable rare gas atoms Rg* (ms 3P2, 3P0) (Rg = Ne, Ar, Kr, Xe) with ground state sodium atoms. Default journal. CopyrightOther than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Using crossed beams of metastable rare gas atoms Rg*(ms 3P2, 3Po) (Rg=Ne, Ar, Kr, Xe) and ground state sodium atoms Na(3s 2S1/2), we have measured the energy spectra of electrons released in the respective Penning ionization processes at thermal collision energies. For Rg*(3P2)+Na(3s), the spectra are quite similar for the different rare gases, both in width and shape; they reflect attractive interactions in the entrance channel with well depths D* [meV] decreasing slowly from R g = N e to Xe as follows: 676(18); 602(23); 565(26); 555(30). For Rg*(3~)+Na(3s), the spectra vary strongly with the rare gas, indicating a change in the character of the interaction from van der Waals type attraction (Ne) to chemical binding for Kr and Xe with well depths D* [meV] of: 51(I9); 107(25); 432(30); 530(50). These findings are explained through model calculations of the respective potential curves, in which the exchange and the spin orbit interaction in the excited rare gas and the molecular interaction between the two valence s-electrons in terms of suitably chosen singlet and triplet potentials are taken into account. These calculations also explain qualitatively the experimental finding that the ratios q2/qo of the ionization cross sections for Rg* (3P2)+Na and Rg* (3Po)+ Na vary strongly with the rare gas fromNe to Xe as follows: 15.8(3.2); 2.6(4); 1.4(2); 1.6(4).

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Section: Introductionmentioning

confidence: 83%

The state dependence of the interaction of metastable rare gas atoms Rg*(ms3 P 2,3 P 0) (Rg=Ne, Ar, Kr, Xe) with ground state sodium atoms

Schohl

Müller

Meijer

et al. 1990

Z Phys D - Atoms, Molecules and Clusters

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“…1,2 It is generally observed that the total energy of a reactive system is not the key parameter determining the reaction mechanism, cross sections, and product energy distributions. 3 Laser-induced fluorescence (LIF) studies, in which the product state distributions are directly determined under single-collision conditions, can supply detailed information necessary for elucidation of the reaction mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…2,[13][14][15][16] Reactions through the electronic excitation of the van der Waals precursor Ca-HX have also been investigated. 17 In most cases the (relative) reaction cross sections strongly depend on the initial spin-orbit state of the excited metal atom.…”

Section: Introductionmentioning

confidence: 99%

“…17 In most cases the (relative) reaction cross sections strongly depend on the initial spin-orbit state of the excited metal atom. 2 It is believed that the distinct alignment of the atomic orbitals results in different energy surfaces owing to electrostatic interactions. From the different surfaces the charge transfer occurs with differing probabilities, influencing the reactive cross sections.…”

Section: Introductionmentioning

confidence: 99%

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Laser-Induced Fluorescence Studies of Excited Sr Reactions. 1. Sr(³P₁) + HF

et al. 1998

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Electronic ground-state SrF (X 2 Σ) products formed in the reaction of electronically excited Sr( 3 P 1 ) with HF are studied using laser-induced fluorescence (LIF) detection. Sr atoms are excited to the 3 P 1 state using a frequency-narrowed and -stabilized linear titanium-sapphire laser at 689.3 nm. The vibrational and rotational population distributions in the SrF(X 2 Σ) products are deduced from the LIF spectra of the B 2 Σ-X 2 Σ and A 2 Π 3/2 -X 2 Σ transitions using spectrum simulation. The results show a strong dependence of the SrF internal energy distribution on the impact parameter. The light H atom is ejected with high translational energy.

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“…This has been and is continuing to be investigated thoroughly for electron scattering on laser-excited atoms using both ~p i n -p o l a r i z e d~~-~~ and spin-unpolarized electrons (e.g., refs. 86-89) and for the scattering of excited alkalis or alkaline earths from rare gases.12y42390-92 F or a recent review on spin-orbit effects in gas-phase chemical reactions, see ref, 93. Here, only two well-understood cases will be discussed, with particular relevance to the polarization effects of concern.…”

Section: Spin-orbit Interactionmentioning

confidence: 99%