Dissociative Recombination of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>HD</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>with an Ultracold Electron Beam in a Cooler Ring

Tanabe, T.; Katayama, Ichiro; Kamegaya, H.; Chida, K.; Arakaki, Y.; Watanabe, Tsutomu; Yoshizawa, M.; Saito, Manabu; Haruyama, Yoshio; Hosono, K.; Hatanaka, K.; Honma, T.; Noda, K.; Ohtani, S.; Takagi, H.

doi:10.1103/physrevlett.75.1066

Cited by 56 publications

(15 citation statements)

References 13 publications

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“…(8) and (9). In the preceding formulae, χ Λ + N + v + is a vibrational wavefunction of the molecular ion, and χ Λ N v is a vibrational wavefunction of the neutral system adapted to the interaction (A) region.…”

Section: Diagonalization Of the Reaction Matrix Kmentioning

confidence: 99%

“…This yields collision-energy resolved rate coefficients while, for sensitive comparison to theory, good control is needed over the ro-vibrational excitation of the incident cations. Following first results on H + 2 in single-pass merged beams [7], the infrared active isotopologue HD + moved into the focus of experiments [8][9][10][11] using the ion-storage ring technique [12], where fast ion beams are stored over many seconds and vibrational de-excitation of HD + is completed within much less than a second [13]. On H + 2 , storage-ring experiments gave access to vibrational de-excitation in electron collisions [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Assignment of resonances in dissociative recombination of HD+ions: High-resolution measurements compared with accurate computations

et al. 2011

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The collision-energy resolved rate coefficient for dissociative recombination of HD + ions in the vibrational ground state is measured using the photocathode electron target at the heavy-ion storage ring TSR. Rydberg resonances associated with ro-vibrational excitation of the HD + core are scanned as a function of the electron collision energy with an instrumental broadening below 1 meV in the low-energy limit. The measurement is compared to calculations using multichannel quantum defect theory, accounting for rotational structure and interactions and considering the six lowest rotational energy levels as initial ionic states. Using thermal equilibrium level populations at 300 K to approximate the experimental conditions, close correspondence between calculated and measured structures is found up to the first vibrational excitation threshold of the cations near 0.24 eV. Detailed assignments, including naturally broadened and overlapping Rydberg resonances, are performed for all structures up to 0.024 eV. Resonances from purely rotational excitation of the ion core are found to have similar strengths as those involving vibrational excitation. A dominant low-energy resonance is assigned to contributions from excited rotational states only. The results indicate strong modifications in the energy dependence of the dissociative recombination rate coefficient through the rotational excitation of the parent ions, and underline the need for studies with rotationally cold species to obtain results reflecting low-temperature ionized media.

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Section: Diagonalization Of the Reaction Matrix Kmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assignment of resonances in dissociative recombination of HD+ions: High-resolution measurements compared with accurate computations

et al. 2011

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“…has been extensively and systematically studied both experimentally and theoretically [23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Rotational transitions induced by collisions ofHD+ions with low-energy electrons

et al. 2014

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A series of computations based on multichannel quantum defect theory have been performed in order to produce the cross sections of rotational transitions (excitationsto 10) and of their competitive process, the dissociative recombination, induced by collisions of HD + ions with electrons in the energy range 10 −5 to 0.3 eV. Maxwell anisotropic rate coefficients, obtained from these cross sections in the conditions of the Heidelberg Test Storage Ring (TSR) experiments (k B T t = 2.8 meV and k B T l = 45 μeV), have been reported for those processes in the same electronic energy range. Maxwell isotropic rate coefficients have been presented as well for electronic temperatures up to a few hundred Kelvins. Very good overall agreement is found between our results for rotational transitions and the former theoretical computations as well as with experiment. Furthermore, due to the full rotational computations performed, the accuracy of the resulting dissociative recombination cross sections is improved considerably.

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“…These non-adiabatic processes, referred to as "indirect" dissociative recombination [ Dissociative recombination of this type has been widely studied at ion storage rings [15,36] at typical energy resolutions down to a few meV. For the fundamental system of HD + [37,38], it turns out that the expected rate for the "direct" process is significantly reduced by the interference with the ro-vibrational Feshbach resonances. The numerous rotational quantum numbers J reached by the "indirect" capture process cause a rich structure in particular at low energies between 1 and 100 meV.…”

Section: Rotational Structure In the Recombination Cross Section Of Tmentioning

confidence: 99%

Progress in stored ion beam experiments on atomic and molecular processes

et al. 2006

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Stored fast ion beams in atomic and molecular collision experiments are discussed with an emphasis on electron-ion interactions at low relative energies. Recent progress was obtained in electron collision spectroscopy using an electroncooled stored ion beam and a separate electron target in the same storage ring; from a cryogenic photocathode, electron beams with internal temperatures of 5 to 10 K were produced. Results are presented for dielectronic recombination resonances, resolving the hyperfine structure of stored lithiumlike scandium ions and obtaining precise results for the fine structure splitting of these ions, and for ro-vibrational resonances in the recombination of electrons with hydrogen molecular ions, revealing sharp structures down to 2 meV. An overview of the cryogenic storage ring (CSR) project in Heidelberg is given.

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Dissociative Recombination ofHD+with an Ultracold Electron Beam in a Cooler Ring

Cited by 56 publications

References 13 publications

Assignment of resonances in dissociative recombination of HD+ions: High-resolution measurements compared with accurate computations

Assignment of resonances in dissociative recombination of HD+ions: High-resolution measurements compared with accurate computations

Rotational transitions induced by collisions ofHD+ions with low-energy electrons

Progress in stored ion beam experiments on atomic and molecular processes

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