Communications: Development and characterization of a source of rotationally cold, enriched para-H3+

Tom, Brian A.; Mills, Andrew A.; Wiczer, Michael; Crabtree, Kyle N.; McCall, Benjamin J.

doi:10.1063/1.3322827

Cited by 7 publications

(4 citation statements)

References 25 publications

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“…For this purpose it was connected to a vacuum chamber evacuated to a base pressure of 10 mtorr by a Leybold WS-2001 roots blower backed by a rotary vane pump. The spectroscopy setup is similar to the one described in [31]. It consists of a continuous wave difference frequency laser (DFG) and a continuous wave cavity ring-down spectrometer.…”

Section: B Supersonic Expansion Source and Spectroscopy Setupmentioning

confidence: 99%

High-resolution storage-ring measurements of the dissociative recombination ofH3+using a supersonic expansion ion source

et al. 2010

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We have performed measurements of the dissociative electron recombination (DR) of H + 3 at the ion storage ring TSR utilizing a supersonic expansion ion source. The ion source has been characterized by continuous wave cavity ring-down spectroscopy. We present high-resolution DR rate coefficients for different nuclear spin modifications of H + 3 combined with precise fragment imaging studies of the internal excitation of the H + 3 ions inside the storage ring. The measurements resolve changes in the energy dependence between the ortho-H + 3 and para-H + 3 rate coefficients at low center-of-mass collision energies. Analysis of the imaging data indicates that the stored H + 3 ions may have higher rotational temperatures than previously assumed, most likely due to collisional heating during the extraction of the ions from the ion source. Simulations of the ion extraction shed light on possible origins of the heating process and how to avoid it in future experiments.

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Section: B Supersonic Expansion Source and Spectroscopy Setupmentioning

confidence: 99%

High-resolution storage-ring measurements of the dissociative recombination ofH3+using a supersonic expansion ion source

et al. 2010

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“…In addition, the exchange mechanism, 62 in which one of the atoms of the H 2 is transferred to the H 3 + subunit, is possible by considering one proton hop followed by the scrambling of the new H 3 + thus formed and a subsequent proton hop back.…”

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confidence: 99%

A new accurate and full dimensional potential energy surface of H5+ based on a triatomics-in-molecules analytic functional form

Aguado

Barragán

Prosmiti

et al. 2010

The Journal of Chemical Physics

163

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In this work a reliable full nine-dimensional potential energy surface for studying the dynamics of H(5)(+) is constructed, which is completely symmetric under any permutation of the nuclei. For this purpose, we develop a triatoms-in-molecules method as an extension of the more common diatoms-in-molecules one, which allows a very accurate description of the asymptotic regions by including correctly the charge-induced dipole and quadrupole interactions. Moreover, this treatment provides a semiquantitative description of all the topological features of the global potential compared with coupled cluster results. In particular, the hop of the proton between two H(2) fragments produces a double well in the potential. This resonant structure involving the five atoms produces a stabilization, lowering the barrier, and the triatoms-in-molecules yields to a barrier significantly higher than the ab initio results. Therefore, to improve the triatomics-in-molecules potential surface, two five-body terms are added, which are fitted to more than 110,000 coupled-cluster ab initio points. The global potential energy surface thus obtained in this work has an overall root mean square error of 0.079 kcal/mol for energies below 27 kcal/mol above the global well. The features of the potential are described and compared with previous available surfaces.

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“…Besides the dynamical details, rather stringent nuclear spin selection rules affect the ratio of [ p H 3 þ ] and [ o H 3 þ ] in the plasma [20,[22][23][24][25][26][27][28]. Therefore the change in p f can be achieved by using e H 2 instead of n H 2 [20,23,29]. By performing the measurements with different [He], the values bin and K He for the individual spin states have been obtained.…”

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Nuclear Spin Effect on Recombination ofH3+Ions with Electrons at 77 K

et al. 2011

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Utilizing different ratios of para to ortho H₂ in normal and para enriched hydrogen, we varied the population of para-H₃⁺ in an H₃⁺ dominated plasma at 77 K. Absorption spectroscopy was used to measure the densities of the two lowest rotational states of H₃⁺. Monitoring plasma decays at different populations of para-H₃⁺ allowed us to determine the rate coefficients for binary recombination of para-H₃⁺ and ortho-H₃⁺ ions: (p)α(bin)(77 K) = (1.9 ± 0.4) × 10⁻⁷ cm³ s⁻¹ and (o)α(bin)(77 K) = (0.2 ± 0.2) × 10⁻⁷ cm³ s⁻¹.

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Communications: Development and characterization of a source of rotationally cold, enriched para-H3+

Cited by 7 publications

References 25 publications

High-resolution storage-ring measurements of the dissociative recombination ofH3+using a supersonic expansion ion source

High-resolution storage-ring measurements of the dissociative recombination ofH3+using a supersonic expansion ion source

A new accurate and full dimensional potential energy surface of H5+ based on a triatomics-in-molecules analytic functional form

Nuclear Spin Effect on Recombination ofH3+Ions with Electrons at 77 K

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