Penning ionization electron spectroscopy of CO2 clusters in collision with metastable rare gas atoms

Maruyama, Ryo; Tanaka, Haruko; Yamakita, Yoshihiro; Misaizu, Fuminori; Ohno, Koichi

doi:10.1016/s0009-2614(00)00848-4

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…From the fact, however, that also DEA takes place (formation of (CO 2 ) n O – ) we propose that in addition to capture of inelastically scattered low-energy electrons, two further mechanisms are operative, resulting in the formation of the solvated ion complexes, namely Penning ionization and DEA induced by coupling of CO 2 to electron-exciton complexes in He. Penning ionization of CO 2 via the He (1s2s) metastable states 3 S and 1 S creates electrons at energies in the range below 6 eV (depending on the amount of energy that remains in the CO 2 cluster) which can induce DEA in CO 2 molecules: 39,40 …”

Section: Resultsmentioning

confidence: 99%

Electron Attachment to CO₂ Embedded in Superfluid He Droplets

et al. 2014

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Electron attachment to CO2 embedded in superfluid He droplets leads to ionic complexes of the form (CO2)n– and (CO2)nO– and, at much lower intensities, He containing ions of the form Hem(CO2)nO–. At low energies (<5 eV), predominantly the non-decomposed complexes (CO2)n– are formed via two resonance contributions, similar to electron attachment to pristine CO2 clusters. The significantly different shapes and relative resonance positions, however, indicate particular quenching and mediation processes in CO2@He. A series of further resonances in the energy range up to 67 eV can be assigned to electronic excitation of He and capture of the inelastically scattered electron generating (CO2)n– and two additional processes where an intermediately formed He* leads to the nonstoichiometric anions (CO2)nO–.

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Section: Resultsmentioning

confidence: 99%

Electron Attachment to CO₂ Embedded in Superfluid He Droplets

et al. 2014

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“…He + M + + e − channels. 16 Thus, by measuring the distribution of Penning electron kinetic energies, we obtain a spectrum of electron binding energies E i of M akin to its photoelectron spectrum (PES), provided E * is known and ∆E is known or negligible.…”

Section: Introductionmentioning

confidence: 99%

“…An alternative method to photoelectron spectroscopy is Penning ionization electron spectroscopy (PIES) . This method, which has been developed for many decades, has its merits for its sensitivity to the spatial electron distribution of molecules, clusters, and surfaces and to anisotropic interaction potentials of the colliding reaction partners . Besides, Penning ionization experiments involving clusters can reveal additional details of complex ionization mechanisms such as autoionization of superexcited states , and vibronic relaxation of excitation. , Traditionally, a rare gas atom, most often He, due to its extremely high excitation energy, is prepared in an excited metastable state and collides with another atom, molecule, or surface, M, to induce the ionization of the latter in the reaction In this reaction, the excess energy is transferred to the emitted Penning electron e – .…”

Section: Introductionmentioning

confidence: 99%

“…This method, which has been developed for many decades, has its merits for its sensitivity to the spatial electron distribution of molecules, clusters, and surfaces and to anisotropic interaction potentials of the colliding reaction partners . Besides, Penning ionization experiments involving clusters can reveal additional details of complex ionization mechanisms such as autoionization of superexcited states , and vibronic relaxation of excitation. , Traditionally, a rare gas atom, most often He, due to its extremely high excitation energy, is prepared in an excited metastable state and collides with another atom, molecule, or surface, M, to induce the ionization of the latter in the reaction In this reaction, the excess energy is transferred to the emitted Penning electron e – . Here, E * is the energy of the metastable rare gas atom, E i is the ionization energy of the colliding particle M, and Δ E is a small energy difference between potential energy curves of the incoming He* + M and outgoing He + M + + e – channels .…”

Section: Introductionmentioning

confidence: 99%

“…Here, E* is the energy of the metastable rare gas atom, E i is the ionization energy of the colliding particle M, and ΔE is a small energy difference between potential energy curves of the incoming He* + M and outgoing He + M + + e − channels. 16 Thus, by measuring the distribution of Penning electron kinetic energies, we obtain a spectrum of electron binding energies E i of M akin to its photoelectron spectrum (PES), provided E* is known and ΔE is known or negligible.…”

Section: ■ Introductionmentioning

confidence: 99%

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Penning Ionization of Acene Molecules by Helium Nanodroplets

et al. 2018

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Acene molecules (anthracene, tetracene, pentacene) and fullerene (C) are embedded in He nanodroplets (He) and probed by EUV synchrotron radiation. When resonantly exciting the He nanodroplets, the embedded molecules M are efficiently ionized by the Penning reaction He + M → He + M + e. However, the Penning electron spectra are all broad and structureless, largely differing from those measured by binary Penning collisions, as well as from those measured for dopants bound to the He droplet surface. Simulations based on elastic binary electron-He collisions qualitatively reproduce the measured spectra only when assuming unexpectedly large He droplets, indicating that electron spectra of molecules embedded in helium nanodroplets are severely affected by collective electron-helium interactions.

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