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 51 publications

(52 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

Self Cite

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

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

et al. 2006

Self Cite

View full text Add to dashboard Cite

“…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

View full text Add to dashboard Cite

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

show abstract

“…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%

See 1 more Smart Citation

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

Graupner¹,

Graham²,

Field³

et al. 2008

International Journal of Mass Spectrometry

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Cited by 51 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

Contact Info

Product

Resources

About