Guided-ion beam measurements of N++H2O charge-transfer and chemical reaction channels

Dressler, Rainer A.; Murad, Edmond

doi:10.1063/1.467275

Cited by 15 publications

(9 citation statements)

References 30 publications

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“…It is suggested that this discrepancy is due to a weaker electronic coupling with the product H 2 O ϩ Ã -state surface. 10 The O ϩ ϩH 2 O collision system, which is exothermic by only ϳ1 eV, appears to violate the Franck-Condon criterion. In this system, the ground state energy level has essentially zero Franck-Condon overlap with product states at resonance.…”

Section: Dynamics Of Hyperthermal Kr ؉ ؉H 2 O Charge-transfer Collisimentioning

confidence: 98%

“…11,12 In particular, charge-transfer cross sections and product ion internal energy distributions were reported for the collision systems X ϩ ϩH 2 O, where X ϩ ϭO ϩ , 7,8 Ar ϩ , 6,9 N 2 ϩ , 6,9 and N ϩ . 4,10 The Ar ϩ ϩH 2 O and N 2 ϩ ϩH 2 O charge-transfer collision systems provided particularly good insight into the charge-transfer dynamics due to the observation of intense H 2 O ϩ Ã 2 A 1 -X 2 B 1 charge-transfer luminescence. 5,6 These systems are exothermic by ϳ3 eV and generally adhere to both energy resonance and Franck-Condon criteria.…”

Section: Dynamics Of Hyperthermal Kr ؉ ؉H 2 O Charge-transfer Collisimentioning

confidence: 99%

“…The distribution of transverse velocity components can in principle be determined by measuring TOF spectra at several rf amplitudes provided the octopole guiding potential has been calibrated with respect to transverse energy confinement. 10,24 The difference of spectra recorded at different rf amplitudes then represent doubly differential cross sections with respect to parallel and transverse velocity components, thus yielding angular scattering distributions. The generation of difference spectra requires the measurement of absolute product ion yields at the respective TOF conditions.…”

Section: A Guided-ion Beam Measurementsmentioning

confidence: 99%

“…Forward-scattered cross sections with an energy dependence of ϳ1/E T are observed in the other ion-H 2 O charge-transfer systems investigated in this laboratory. 7,9,10 The 1/E T dependence is associated with the importance of the long-range ion-permanent dipole interaction in forming longer-lived intermediates. A pure ion-dipole interaction would result in a 1/E T dependence of the capture cross section.…”

Section: A Guided-ion Beam Measurementsmentioning

confidence: 99%

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Dynamics of hyperthermal Kr++H2O charge-transfer collisions

Arnold

Dressler

Bastian

et al. 1995

The Journal of Chemical Physics

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Cross section, time-of-flight ͑TOF͒ and luminescence measurements are reported for the Kr ϩ ϩH 2 O charge-transfer system. Cross section and TOF measurements were carried out in an octopole guided-ion beam apparatus and are reported for collision energies between 0.10-10 eV ͑c.m.͒. The charge-transfer cross section has approximately an E Ϫ0.5 dependence at low collision energies. TOF measurements of H 2 O ϩ products are characteristic of a near-resonant direct charge-transfer mechanism proceeding at long range. A smaller contribution of forward-scattered ions is attributed to the formation of longer-lived collision complexes. The TOF analysis based on the osculating complex model reveals significant energy transfer for orbiting trajectories. Low resolution product ion luminescence spectra ͑4 nm FWHM͒, taken at collision energies between 0.1-15 eV ͑c.m.͒, are consistent with the TOF measurements. The optical spectra show that H 2 O ϩ product ions are formed in Ã -state vibrational levels that are at or below the energy level of Kr ϩ ( 2 P 1/2 ) reactants. No evidence is found for luminescence stemming from Kr ϩ ( 2 P 3/2 ) reactants.

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Section: Dynamics Of Hyperthermal Kr ؉ ؉H 2 O Charge-transfer Collisimentioning

confidence: 98%

Section: Dynamics Of Hyperthermal Kr ؉ ؉H 2 O Charge-transfer Collisimentioning

confidence: 99%

Section: A Guided-ion Beam Measurementsmentioning

confidence: 99%

Section: A Guided-ion Beam Measurementsmentioning

confidence: 99%

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Dynamics of hyperthermal Kr++H2O charge-transfer collisions

Arnold

Dressler

Bastian

et al. 1995

The Journal of Chemical Physics

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“…A similar observation was made in the reactions of N + (-'S) with H2O, in which the NO + channel, which at low energies proceeded on the exothermic singlet surface, was seen to undergo a sharp rise in cross section at the collision energy corresponding to access to the spin-allowed triplet PES. 19 The spin conservation constraint proved important in the interpretation of the related 0 + + CH4 reaction system.-'' 4 Direct dynamics calculations' revealed that all the minor product channels observed for that system in experiments 4 could be accounted for in spin-allowed reaction pathways. Another result of the 0 + + CH 4 direct dynamics work that may offer insight into the present results is that the calculations show that OH + derives from a stripping mechanism, involving large impact parameters and leading to forward scattered ions.…”

Section: Discussionmentioning

confidence: 99%

A Guided-Ion Beam Study of the O⁺(⁴S) + NH₃ System at Hyperthermal Energies

2008

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden to Department of Defense, Washington Headquarters Services Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204. Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law. no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR Al PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Air Force Research Laboratory /RVBXT 29 Randolph Road Hanscom AFB, MA 01731-3010 PERFORMING ORGANIZATION REPORT NUMBER AFRL-R V-HA-TR-2008-1119 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)AFRL/RVBXT SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for Public Release; distribution unlimited. ABSTRACTWe have measured absolute cross sections for the reaction of ground-state 0 + with ammonia at collision energies in the range from near-thermal to approximately 15 eV, using the guided-ion beam (GIB) method. Measurements were also performed using ammonia-^ to aid in mass assignments. The reaction is dominated at low collision energies by charge transfer; however, the cross section for this exothermic channel is rather small, decreasing sharply with energy from -40 A 2 for normal ammonia at nearthermal energies and leveling off at 3.7 A 2 above 6 eV; the cross section is slightly smaller for ammonia-d 3 . Other channels, corresponding to the production of NH 2 + and NO + ' and possibly OH + , were detected. The NO* channel, although nominally exothermic, is very small and exhibits a threshold of ~7 eV. Product recoil velocity distributions were also determined at selected collision energies, using GIB time-of-flight methods. Research. 140 Commonwealth Avenue, Chestnut Hill, Massachusetts 02159 Received: April 10, 2008: Revised Manuscript Received: July 14, 2008 SUBJECT TERMS Guided-ion beam O O o oWe have measured absolute cross section for the reaction of ground-state 0 + with ammonia at collision energies in the range from near-thermal to approximately 15 eV, using the guided-ion beam (GIB) method. Measurements were also performed using ammonia-di to aid in mass assignments. The reaction is dominated at low collision energies by charge transfer; however, the cross section for this exothermic channel is rather small, decreasing sharply with energy from ~40 A 2 for normal ammonia at near-thermal energies and leveling off at 3.7 A 2 above 6 eV; the cross section is slightly smaller for ammonia-dj. Other channels, correspondi...

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Plasma bubbles: a route to sustainable chemistry

et al. 2021

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Atmospheric plasma discharges are finding increased applications in addressing environmental challenges including water purification, chemical synthesis and biotechnology. An effective means of interfacing the reactivity of plasma gas discharges with liquids is needed to enhance liquid phase chemical reactions. Plasma discharges in bubbles has been considered as an innovative solution for achieving this goal potentially offering electrically driven, sustainable chemistry with low energy consumption and the unique benefit of maintaining a large volume discharge under the liquid surface. Here we provide a concise review on the state-of-art for research on plasma-bubble interactions and a perspective for future research.

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Guided-ion beam measurements of N++H2O charge-transfer and chemical reaction channels

Cited by 15 publications

References 30 publications

Dynamics of hyperthermal Kr++H2O charge-transfer collisions

Dynamics of hyperthermal Kr++H2O charge-transfer collisions

A Guided-Ion Beam Study of the O⁺(⁴S) + NH₃ System at Hyperthermal Energies

Plasma bubbles: a route to sustainable chemistry

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Guided-ion beam measurements of N++H2O charge-transfer and chemical reaction channels

Cited by 15 publications

References 30 publications

Dynamics of hyperthermal Kr++H2O charge-transfer collisions

Dynamics of hyperthermal Kr++H2O charge-transfer collisions

A Guided-Ion Beam Study of the O+(4S) + NH3 System at Hyperthermal Energies

Plasma bubbles: a route to sustainable chemistry

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A Guided-Ion Beam Study of the O⁺(⁴S) + NH₃ System at Hyperthermal Energies