Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Fluorescence emission following core excitations in the water molecule
KTH, Skolan för teknikvetenskap (SCI), Fysik, Atom- och molekylfysik.
Vise andre og tillknytning
2006 (engelsk)Inngår i: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 39, nr 5, s. 1101-1112Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Photon-induced fluorescence spectroscopy has been used to study the fragmentation of the water molecule at the O 1s is edge. Fluorescence emission has been observed from the neutral fragments H, O and OH as well as from the ionic fragments O+ and OH+. The extracted fluorescence yields of the H Lyman-alpha emission and O 2p(3)(S-4)3p(P-3) -> 2p(3)(S-4)3s(S-3) transitions show the same structures as the total ion yield spectrum but with different relative intensities. The most intense fluorescence emission is restricted to the region of the core excitations, while above the O 1s ionization limit the signal is much weaker (in the case of H) or below the detection limit (O, OH and OH+). The fluorescence emission is concluded to follow from the following general cascade: the core-excited states decay by resonant Auger transitions, the final states reached undergo dissociation into ionic and neutral fragments, and fluorescence occurs from excited fragments. In the case of the OH (A(2)Sigma(+) -> X-2 Pi) emission, the decay of core-excited states through soft x-ray emission may also be responsible for the observed fluorescence.

sted, utgiver, år, opplag, sider
2006. Vol. 39, nr 5, s. 1101-1112
Emneord [en]
high-resolution photoabsorption, dispersed spectroscopy, h2o, dissociation, oh, d2o, photodissociation, photofragments, ultraviolet, radicals
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-5535DOI: 10.1088/0953-4075/39/5/009ISI: 000237753700014Scopus ID: 2-s2.0-33244473688OAI: oai:DiVA.org:kth-5535DiVA, id: diva2:9932
Merknad
QC 20100910Tilgjengelig fra: 2006-04-05 Laget: 2006-04-05 Sist oppdatert: 2017-11-21bibliografisk kontrollert
Inngår i avhandling
1. Synchrotron radiation spectroscopy of molecular dynamics beyond the valence shell
Åpne denne publikasjonen i ny fane eller vindu >>Synchrotron radiation spectroscopy of molecular dynamics beyond the valence shell
2006 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis presents experimental results on molecular spectroscopy of gas phase molecules using synchrotron radiation. It deals mainly with dynamical processes following resonant excitation of electrons from core and inner-valence shells of the following systems H2O, H2, SF6 and CD4. In order to reach these deep electrons and excite them photons in the energy range from 25 to 550 eV were used, depending on the particular system.

Two experimental techniques are used. Photon induced fluorescence spectroscopy is used to study the fluorescence emission of fragments after the decay of resonant coreexcited states for the water molecule, and after doubly excited states and resonant excitations of inner-shell electrons for H2 and SF6 respectively. Only the emission in the visible and near infrared range (300-900nm) and the Lyman-α transitions are measured. Energy resolved electron-ion coincidence is used for the study of the fragmentation of CD4 and SF6 after selective ionisation of one of the outer-valence orbitals. In the case of CD4 the fragmentation is compared for the cases in which the ionisation is done directly, or through participator Auger decay of different resonantly core-excited states.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2006. s. xiv, 59
Serie
Trita-FYS, ISSN 0280-316X ; 2006:13
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-3899 (URN)91-7178-294-X (ISBN)
Disputas
2006-04-20, Sal FB 53, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Veileder
Merknad
QC 20100910Tilgjengelig fra: 2006-04-05 Laget: 2006-04-05 Sist oppdatert: 2010-09-10bibliografisk kontrollert
2. Flourescence properties of trendy molecules studied with synchrotron radiation
Åpne denne publikasjonen i ny fane eller vindu >>Flourescence properties of trendy molecules studied with synchrotron radiation
2006 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis summarises the experimental results on molecular spectroscopy of gas phase molecules using synchrotron radiation in the UV- VUV and soft-X rays regions. The results of applying Photon Induced Fluorescence Spectroscopy (PIFS) to D2, H2S, H2O and pyrimidine are presented and discussed. Both inner and outer shell excitations of free molecules lead to different relaxation processes. However, a common result is that when the molecule breaks and the resulting neutral fragments are left in an excited state, they might fluoresce in the UV- Vis range. PIFS technique has two main advantages, it permits to detect neutral fragments and to identify the fluorescing species. From this fact, we can infer dissociation channels and trace back the electronic processes that led to the fluorescence. For these molecules we have analysed and interpreted both dispersed and undispersed fluorescence. What motivates our work is the lack of fluorescence studies and in a more general sense, to contribute to the knowledge of important molecules for life such as water and pyrimidine.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2006. s. ix, 47
Serie
Trita-FYS, ISSN 0280-316X ; 2006.57
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-4148 (URN)91-7178-428-4 (ISBN)
Presentation
2006-10-09, Sal FA31, AlbaNova universitetscentrum, Roslagstullsb 21, Stockholm, 10:00
Opponent
Veileder
Merknad
QC 20101125Tilgjengelig fra: 2006-10-13 Laget: 2006-10-13 Sist oppdatert: 2010-11-25bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekstScopushttp://www.iop.org/EJ/abstract/0953-4075/39/5/009

Søk i DiVA

Av forfatter/redaktør
Kivimäki, AnttiAlvarez Ruiz, JesusMelero Garcia, EmilioVall Llosera, Gemma
Av organisasjonen
I samme tidsskrift
Journal of Physics B: Atomic, Molecular and Optical Physics

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 214 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf