Formation of small water cluster anions by attachment of very slow electrons at high resolution

Weber, J. Mathias; Leber, E.; Ruf, M.-W.; Hotop, H.

doi:10.1007/s100530050385

Cited by 52 publications

(52 citation statements)

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“…1. The energy range 1-200 meV was covered at resolutions down to 1 meV by the standard LPA method [13,37,38]: energy-variable photoelectrons are created in the reaction region with the target gas by resonant two-color photoionization of groundstate potassium atoms [37]. The electron energy range is limited to about 200 meV by the tuning range of the photoionization laser.…”

Section: Methodsmentioning

confidence: 99%

IR photon enhanced dissociative electron attachment to SF6: Dependence on photon, vibrational, and electron energy

et al. 2006

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Section: Methodsmentioning

confidence: 99%

IR photon enhanced dissociative electron attachment to SF6: Dependence on photon, vibrational, and electron energy

et al. 2006

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“…In the last decade or so, such measurements have also begun to contribute information on the properties of atomic and molecular clusters, fullerenes, and helium nanodroplets (see, for example, [2][3][4][5][6][7] and references therein). For free metal clusters, there have appeared some experimental studies of electron-impact ionization and fragmentation [8][9][10] and of slow electron attachment [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

An inelastic threshold in electron - alkali cluster collisions

Kasperovich

Wong

Tikhonov

et al. 2001

The European Physical Journal D

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An analysis of integral cross sections for slow electron collisions with neutral sodium clusters and nanoparticles reveals that, in addition to an effective negative ion formation channel, there exists a strong inelastic threshold-type process which appears above a collision energy of 1-1.3 eV. We show that it can be plausibly associated with the onset of direct electron-induced cluster fragmentation. This result highlights the importance of understanding the dynamics of electron-vibrational energy transfer in nanoclusters, including the relative probability of direct vs. statistical energy transfer. PACS. 36.40.-c Atomic and molecular clusters -36.40.Qv Stability and fragmentation of clusters -34.80.Ht Dissociation and dissociative attachment by electron impact

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“…An anion mass spectrum taken at very low electron energies (using electron transfer from highly excited K**(nd) Rydberg atoms with n ≈ 140; see, e.g., [21]) yielded SF 5 − as the dominant anion product. SF 6 − anions were detected at a relative intensity level of about 3.5% and attributed to a minor SF 6 impurity (relative density about 1%); correspondingly, SF 5 − anions resulting from DEA to SF 6 contribute to the SF 5 − yield at a negligible level (see Ref.…”

Section: Laser Photoelectron Attachment Experiments (Kaiserslautern)mentioning

confidence: 99%

“…The energy range 1-200 meV was covered at resolutions of about 2 meV by the standard LPA method [20]: energy-variable photoelectrons (typical current 40 pA) are created in the reaction region with the target gas by resonant two-color photoionization of ground state potassium atoms via the excited K(4p 3/2 ) level [21]. Higher electron energies were accessed by the extended laser photoelectron attachment method [22]: here near-zero energy photoelectrons are produced in an auxiliary photoionization chamber (distance from reaction centre about 5 cm), accelerated by a weak electric field in a guiding magnetic field (0.002 T), brought to the energy of interest prior to traversal through the target region, and subsequently accelerated and deflected onto a collector plate.…”

Section: Laser Photoelectron Attachment Experiments (Kaiserslautern)mentioning

confidence: 99%

“…In order to measure highly resolved cross-sections for anion formation in low-energy electron collisions with SF 5 CF 3 , we used two variants of the laser photoelectron attachment method, as discussed elsewhere in detail [20][21][22]. The energy range 1-200 meV was covered at resolutions of about 2 meV by the standard LPA method [20]: energy-variable photoelectrons (typical current 40 pA) are created in the reaction region with the target gas by resonant two-color photoionization of ground state potassium atoms via the excited K(4p 3/2 ) level [21].…”

Section: Laser Photoelectron Attachment Experiments (Kaiserslautern)mentioning

confidence: 99%

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Highly resolved absolute cross-sections for dissociative electron attachment to SF5CF3

Graupner¹,

Graham²,

Field³

et al. 2008

International Journal of Mass Spectrometry

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a b s t r a c tUsing two complementary experimental methods, we have measured partial (mass-resolved) crosssections for dissociative electron attachment to the molecule trifluoromethyl sulfurpentafluoride (SF 5 CF 3 ) at the gas temperature T G = 300 K over a broad range of electron energies (E = 0.001-12 eV). The absolute scale for these cross-sections was obtained with reference to the thermal (T = 300 K) rate coefficient for anion formation (8.0(3) × 10 −8 cm 3 s −1 ). Below 1 eV, SF 5 − is the dominant product anion and formed through the lowest anion state which cuts the neutral SF 5 CF 3 potential close to the S-C equilibrium distance. The highly resolved laser photoelectron attachment data exhibit a downward Wigner cusp at 86 meV, indicating that the 4 (a 1 ) vibrational mode is important for the primary attachment dynamics. Both SF 5 − and F − anions are formed with similar yields through the first excited resonance located near 3.6 eV. Towards higher energies, the anions CF 3 − , SF 4 − , and SF 3 − are also produced. Summation of the partial cross-sections yields a total absolute cross-section for anion formation over the energy range 0.001-12 eV. This is used to calculate the dependence of the rate coefficient for dissociative electron attachment over a broad range of electron temperatures for the fixed gas temperature T G = 300 K; good agreement is found between the calculated values and those obtained in a drift tube experiment. In addition to the experimental work, semiempirical R-matrix calculations have been carried out for the energy dependence of the cross-section for SF 5 − formation. The experimental findings are semi-quantitatively recovered.

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Formation of small water cluster anions by attachment of very slow electrons at high resolution

Cited by 52 publications

References 0 publications

IR photon enhanced dissociative electron attachment to SF6: Dependence on photon, vibrational, and electron energy

IR photon enhanced dissociative electron attachment to SF6: Dependence on photon, vibrational, and electron energy

An inelastic threshold in electron - alkali cluster collisions

Highly resolved absolute cross-sections for dissociative electron attachment to SF5CF3

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