State-selected ion desorption from condensed H2O at 80 K studied by Auger electron–photoion coincidence spectroscopy

Nagasono, Mitsuru; Mase, Kenji; Tanaka, Shinichiro; Urisu, Tsuneo

doi:10.1016/s0009-2614(98)01187-7

Cited by 17 publications

(7 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The strong Coulomb interaction between the two holes in an Auger final state leads to the fragmentation and desorption due to the Coulomb repulsion [18], i.e., the so-called Coulomb explosion mechanism. This is the well known Auger stimulated ion desorption (ASID) mechanism that was studied extensively for molecules adsorbed or condensed on surfaces [19][20][21][22][23][24] as well as polymers [25][26][27].…”

Section: Resultsmentioning

confidence: 99%

Photon stimulated ion desorption from poly(3-methylthiophene) following sulphur K-shell excitation

et al. 2004

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Photon stimulated ion desorption from poly(3-methylthiophene) following sulphur K-shell excitation

et al. 2004

View full text Add to dashboard Cite

“…18 We have also used the AEPICO technique to investigate the desorption of H ϩ from condensed H 2 O. 7,[19][20][21] This process of desorption is explicable in terms of the ASD mechanism; the two-hole final state of the process of O-KLL Auger decay is responsible for the desorption because of the hole-hole Coulomb repulsion and of the electron missing from the orbitals of the O-H bond. 19 The yield of desorbed H ϩ was also observed to be greatly increased by the excitement of a core electron into an antibonding orbital (4a 1 ).…”

Section: Introductionmentioning

confidence: 99%

“…7,[19][20][21] This process of desorption is explicable in terms of the ASD mechanism; the two-hole final state of the process of O-KLL Auger decay is responsible for the desorption because of the hole-hole Coulomb repulsion and of the electron missing from the orbitals of the O-H bond. 19 The yield of desorbed H ϩ was also observed to be greatly increased by the excitement of a core electron into an antibonding orbital (4a 1 ). 7,[20][21][22] This increase was attributed to the strong repulsion in the two-hole-one-electron final state of the spectator Auger decay following the core-toantibonding-level excitation.…”

Section: Introductionmentioning

confidence: 99%

Ion desorption induced by core-level excitation of H2O/Si(100): Evidence of desorption due to the multielectron excitation/decay

Tanaka

Mase²,

Nagaoka

et al. 2002

The Journal of Chemical Physics

View full text Add to dashboard Cite

Articles you may be interested inCore-level positive-ion and negative-ion fragmentation of gaseous and condensed HCCl3 using synchrotron radiation J. Chem. Phys. 135, 044303 (2011); 10.1063/1.3615626Theoretical study of the UV-induced desorption of molecular oxygen from the reduced TiO 2 (110) surface J. Chem. Phys. 118, 5098 (2003); 10.1063/1.1545093Photon-stimulated ion desorption from mono-and multilayered silicon alkoxide on silicon by core-level excitation Study of ion desorption induced by carbon core excitation for poly-methylmethacrylate thin film using electron-ion coincidence spectroscopy This work is an investigation of the desorption by O 1s excitation of ions from Si͑100͒ reacted with water. Photoelectron, photostimulated desorption, and electron-ion coincidence spectroscopy are used to observe the process. When the incident photons have energy levels which are near the 1s threshold of O, they induce Auger decay that is accompanied by shakeup/off excitation and cascade Auger decay, and they are shown to be the main factor responsible for desorption in this case. When the photons have energy levels which are above the shakeup threshold, most of the desorption that occurs is a result of the shakeup excitation that accompanies the core excitation. In both cases, the desorption is induced by the respective multihole final states. The ion desorption yield for the two-hole final states of the normal process of Auger decay is small. The results are discussed, with the help of the Auger electron spectra, mainly in terms of the lifetime of the final state of Auger decay.

show abstract

“…The inertness of the C u O u C complex in a defective nanotube was confirmed by our DFT calculations, which suggest that H atoms preferentially attach to carbon rather than oxygen sites. Inspired by the observed disintegration of H 2 O molecules by a resonant Auger process, 8 we decided to study photochemical processes in oxidized nanotubes as an alternative to chemical and thermal purification methods.…”

mentioning

confidence: 99%

Photodesorption of oxygen from carbon nanotubes

Miyamoto¹,

Jinbo²,

Nakamura³

et al. 2004

Phys. Rev. B

View full text Add to dashboard Cite

We propose to use photodesorption as a noninvasive tool to clean carbon nanotubes from oxygen, offering a clear advantage over thermal and chemical treatments. The detachment of chemisorbed oxygen from atomic vacancies is triggered by a resonant Auger process, initiated by an O 1s → O 2p transition, which leaves two holes in the O 2s level. In the electronically excited state, oxygen desorbs spontaneously, with no damage to the carbon network or the cylindrical nanotube shape. Subsequent reaction of oxygen atoms with H 2 molecules is shown to prevent reoxidation of the nanotube.Oxidation is commonly used to purify carbon nanotubes (CNTs) from amorphous carbon soot. 1 The efficiency of this process relies on the fact that carbon soot converts easily to CO and CO 2 , which subsequently evaporate, in contrast to structurally perfect nanotubes and graphite, which are rather unreactive. Ab initio density functional theory (DFT) calculations 2,3 indeed suggest that the interaction of molecular oxygen with carbon nanotubes should be weak, in stark contrast to the dissociative adsorption of oxygen atoms at the edges 4 and at defect sites 5 of carbon nanotubes. There, chemisorbed oxygen forms chemically strong C u O u C complexes, which have been observed by near-edge x-ray absorption fine-structure spectroscopy. 6 Whereas physisorption of O 2 causes hole doping and increases the electronic conductivity of semiconductor nanotubes, 2 formation of C u O u C complexes destroys the perfect -bonding network and thus decreases the conductivity of nanotubes. Finding an effective way to remove the chemisorbed oxygen is a necessary prerequisite for a practical use of carbon nanotubes in electronic devices.Removal of the chemisorbed oxygen atoms by heat treatment comes with the inevitable side effect of damaging the carbon network surrounding the O atom, due to the higher stability of the C u O bond in comparison to C u C bonds. 4 Such structural damage is evidenced in temperature programed mass spectra of oxidized carbon nanohorns, 7 with a graphitic network similar to nanotubes, which show a preferential desorption of CO and CO 2 molecules rather than oxygen at high temperatures. The stability of the C u O bond also makes alternative chemical processes, designed for selectively breaking the C u O bond, very unlikely. The inertness of the C u O u C complex in a defective nanotube was confirmed by our DFT calculations, which suggest that H atoms preferentially attach to carbon rather than oxygen sites. Inspired by the observed disintegration of H 2 O molecules by a resonant Auger process, 8 we decided to study photochemical processes in oxidized nanotubes as an alternative to chemical and thermal purification methods.Here we propose to use photodesorption as an efficient, noninvasive way to clean carbon nanotubes from chemisorbed oxygen. Results of our first-principles simulations for electron ion dynamics (FPSEID) 9 suggest that the strong C u O bonds can be efficiently ruptured by optically promoting the bonding electrons into an...

show abstract

State-selected ion desorption from condensed H2O at 80 K studied by Auger electron–photoion coincidence spectroscopy

Cited by 17 publications

References 27 publications

Photon stimulated ion desorption from poly(3-methylthiophene) following sulphur K-shell excitation

Photon stimulated ion desorption from poly(3-methylthiophene) following sulphur K-shell excitation

Ion desorption induced by core-level excitation of H2O/Si(100): Evidence of desorption due to the multielectron excitation/decay

Photodesorption of oxygen from carbon nanotubes

Contact Info

Product

Resources

About